History of infusoria, including the desmidiaceae and diatomaceae, British and foreign / by Andrew Pritchard.

  • Andrew Pritchard
Date:
1861
Catalogue details

Licence: Public Domain Mark

Credit: History of infusoria, including the desmidiaceae and diatomaceae, British and foreign / by Andrew Pritchard. Source: Wellcome Collection.

Provider: This material has been provided by Royal College of Physicians, London. The original may be consulted at Royal College of Physicians, London.

    955/1074 (page 935)
    or TUE AOTlNISCEiE. lanceolate; secondary tubes distinct. KB. S118 pi. 27. f. 12. = Schizonema albicans, ie. Adriatic Sea. 1-1200 to 1-1080. Meueghiui describes the valves as broadly elliptic. M. Berkdeyi (K.).—Frond tufted, didl olive-brown; filaments setaceous, rather rigid, branched; branches erect, attenu- ated ; naviculaa large; valves elliptic- oblong, in very distinct secondary tubes. KA. p. 106. Torquay. Navicnla)^ in front view pai-aUelogramic. 1-1080. FAMILY XIX.—ACTINISCE^. Individuals silicious, furnished with radiating spines. Marine. The Acti- niscefE bear little or no resemblance to the Diatomaceaj, and ought to be ex- cluded fi-om them. M. de Brebisson thinks they would be more appropriately placed near the ArceUa, Euglypha, or some aUied genus. On the other hand. Professor Bailey would refer them to the Polycystina. Genus ACTINISCUS (Ehr.).—Frustules solid, star-like. Aetiniscus differs from Dictyocha and Mesocena in having a soHd centre or body from which rays, varying in number and form, diverge. AcTiNiscus Sirius (E.). — Eays 6, acute, winged at the base. EM. pi. 33. 15. f. 1. 1-1150. Alive, Norway; fossil, America. The rays seem to arise from the disc, and not from the margin. A. Pentasterias (E.).—Rays 5, acute, not (or but partially) exserted. EM. pi. 35 a. 23. f. 1. 1-1150. Alive, Norway; fossil, Greece and America. A. tetrasterias (E.).—Eays 4, acute, not (or but partially) exserted. EM. pi. 18. f. 62. 1-1008. Virginia. The last two forms may be varieties of A. Sirim. A. ? Stella (E.). — Stellate, with 6, marginal, obtuse rays or te&th.= Dicty- ocha, E. 1838. Fossil. Em-ope and Afi-ica. A. P qidnarius (E.).—Stellate, with 5, marginal, obtuse rays or teeth. 1-3120. Fossil, ^gina. A. ? Eota (E.).—Wheel-like, vsdth 10, short, obtuse, spoke-like rays. 1-1920. Gran. A. ? Discm (E.).— Disciform; centi'e smooth; rays 8, marginal, not exserted. 1-2304. Gran. According to Ehren- berg, the last foiu- species may belong to Phytolitharia. A. ? Lancearius (E.).—Stellate, vsdth 8 exserted, lanceolate rays, and some central shorter ones. 1-240. Genus DICTYOCHA forated; foramina large. * Foramina, or cells, two or three. Dictyocha Ponticulus (E.). — Frus- tules oblong, unarmed, transversely divided into 2 ceUs. 1-432. Fossil. Bermuda. D. Quadratum (E.).—Subquadrate or oblong, ti-ansversely divided into 2 cells, a spine at each end. 1-480. Bermuda. These two forms were fii'st obsei-ved and figured by Professor Bailey. D. Pons (E.).—Roundish, with 2 cells and 4 spines. 1-504'. Gran. D. triacantha (E.).—Triangular, with spinous angles; cells 3, imarmed. Mary- land. D. tripyla (E.). — Roimdish, with 4 in-egular spines; cells 3, imarmed. 1-492. Gran. D. trifonestra (E.). — Quadrate, 4- spined; cells 3, dentate. Recent and fossil. (XV. 35.) (Ehr.).—Frustules free, spinous, reticulately per- D. Ahyssarum (E.).—Frustules tiian- gular, with 2 cells; spines 3; 1 cell fm-- nished with an internal tooth. EB. 1854, p. 238. Atlantic. 2* Diamond^shaped or quadrate; 4- spined] foramina 4 or more. D. Fibula (E.). — Cells 4, unarmed. 1-1150 to 1-560. Recent and fossil. (XV. 34.) D. Epiodon (E.). — Resembles D. Fibula, but the cells are fmnished with a tooth. Recent and fossil. D. abnormis (E.).—Cells 5, unequal, all marginal. 1-1080. Fossil. D. Crux (E.). — Four unamied cells round a central one. 1-624. Fossil. D. StaurodoH (E.). — Resembles D. Crux; but each marginal cell bears a tooth. 1-570. Fossil. Virginia. D. mcsophthalma (E.). — Resembles the two preceding species; but each mai'-