Mollusca : testacellidæ and zonitidæ / by W.T. Blanford and H.H. Godwin-Austen.

  • William Thomas Blanford
Date:
1908
Catalogue details

Licence: In copyright

Credit: Mollusca : testacellidæ and zonitidæ / by W.T. Blanford and H.H. Godwin-Austen. Source: Wellcome Collection.

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    [MOLLUSCA. Class GASTEROPODA. Order PULMONATA. Suborder GEOPHILA or STYLOMATOPHORA. Group A G N A T H A. Family TESTACELLID2E. %! Subfamily STREPTAXINiE.] * Animal carnivorous, slug-like or snail-like; a shell generally present, but varying much in form. No jaw (hence the group is often distinguished as Agnathci). Radula with numerous rows of long, narrow teeth, usually pointed. Distribution. Temperate and tropical regions of the world. The majority of the genera are African or South American. Two are Indian, both shell-bearing. Synopsis of Genera. Shell heliciform, last whorl excentric Streptaxis, p. 1. Shell pupiform Ennka, p. 16. Genus STREPTAXIS. Streptaxis, Gray, Loudon's Mag. N. H. new ser. i, 1837, p. 485 ; Stol. J. A. S. B. xl, 1871, p. 159 (anatomy). Type, S. nobilis, Gray, from Sierra Leone. Bange. South-eastern Asia and a few of the islands ; Mascarene Islands; Tropical Africa and South America. Found in the Indian Peninsula to the southward only, in Ceylon, [Andaman and Nicobar Islands,] Assam, and Burma, but not in the Himalayas except east of Bhutan. Fig. 1.—Streptaxis pfeifferi. (After Stoliczka.) Shell thin hyaline, or thicker alabastrine, heliciform, the last whorl or last two whorls excentric, diverging from the axis of the upper whorls. * In this volume the additions to the MS. as left by Dr. W. T. Blanford have been made by Lt.-Col. H. H. Godwin-Austen and are placed between brackets. £
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