The Fauna of British India, including Ceylon and Burma / edited by A.E. Shipley. Freshwater sponges, Hydroids & Polyzoa / by N. Annandale.

Date:
1911
Catalogue details

Licence: In copyright

Credit: The Fauna of British India, including Ceylon and Burma / edited by A.E. Shipley. Freshwater sponges, Hydroids & Polyzoa / by N. Annandale. Source: Wellcome Collection.

Provider: This material has been provided by London School of Hygiene & Tropical Medicine Library & Archives Service. The original may be consulted at London School of Hygiene & Tropical Medicine Library & Archives Service.

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    as they are formed in this country at the approach of summer instead of, as in Europe and N. America, at that of winter. It is best, therefore, to call them “ resting buds.” They consist of masses of cells congregated at the base of the zooecia, gorged with food material and covered with a resistant horny covering. The family Paludicellid® consists of three genera which may be distinguished as follows :— I. Orifice terminal; main axis of the zooecium vertical; zooecia separated from one another by tubules. [A. Ease of the zooecia not swollen ; no adven- titious buds POTTSIELLA.] B. Base of the zooecium swollen ; adventitious [p. 194. buds produced near the tip Victorella, II. Orifice subterminal, distinctly on the dorsal surface ; main axis of the zooecium horizontal (the zoarium being viewed from the dorsal surface); buds not produced at the tip of the [p. 192. zooecia Palubicella, Of these three genera, Pottsiella has not yet been found in India and is only known to occur in IST. America. It consists of one species, P. erecta (Potts) from the neighbourhood of Philadelphia in the United States. Victorella includes four species, V.pavida known from England and Germany and said to occur in Australia, V. miilleri from Germany (distinguished by possessing parietal muscles at the tip of the zooecia), V. symbiotica from African lakes and V. ben- galensis from India. These species are closely related. Paludicella is stated by Carter to have been found in Bombay, but probably what he really found was the young stage of V. bengalensis. A single species is known in Europe and US’. America, namely P. ehrenbergi, van Benedeh ( = Alcyondla articu- latei, Ehrenberg). I have examined specimens of all the species of this family as yet known. Genus 1. PALUDICELLA, Gervais. Paludicella, Gervais, Compt. Rend, iii, p. 797 (1836). Paludicella, Allman, Mon. Fresh-Water Polyzoa, p. 113 (1857). ? Paludicella, Carter, Ann. Nat. Hist. (3) iii, p. 333 (1859). Paludicella, Jullien, Bull. Soc. zool. France, x, p. 174 (1885). Paludicella, Kraepelin, Deutsch. Siisswasserbryozoen, i, p. 96 (1887). Paludicella, Loppens, Ann. Biol, lacustre, iv, p. 14 (1910). Zoarium. The nature of the zoarium in this genus is well ex- pressed by Ehrenberg’s specific name “ articulata,” although the name was given under a false impression. The zooecia arise directly from one another in linear series with occasional side- branches. The side-branches are, however, often suppressed. The zoarium as a whole is either recumbent and adherent or at least partly vertical.