286:: MOLLUSCA.. 
CYLINDRELLA. 
Les Trachéloides, Férussac, Tab. Syst. Anim. Moll., Prodr. gén. p. 61 (1821-22). 
Brachypus, Lansdown Guilding, Zool. Journ. iv. p. 167 (1828) [nec Meyer, 1815 (Aves), Meigen, 
1824: (Ins.) ]. 
Pupa, subgen. Urocoptis et Brachypodella, Clausilia, subgen. Apoma, Beck, Index Moll. pp. 83, 89 
(1837). 
Siphonostoma, Swainson, Treatise on Malacology, p. 333 (1840) [mec Zenk., 1832 (Rot.), Voigt, 
1836 (Vermes) |. oe 
Cylindrella, Pfeiffer, Archiv f. Naturg. vi. 1, p. 88 (1840); Monogr. Helic. Vivent. i. Introd. 
p. xxii, and i. p. 868 &c. (part.). 
Cylindrella, subgen. Thaumasia (part.), Mychostoma, Gongylostoma, and Casta, Albers, Die Heli- 
ceen, ed. 1, pp. 207, 208 (1850). 
Cylindrella, subgen. Urocoptis (part.), Mychostoma, Gongylostoma, Trachelia, and Casta, Albers, 
Die Heliceen, ed. 2, pp. 36-42 (1860). 
Cylindrella, P. Fischer, Manuel de Conch. p. 476 (1887). 
Shell cylindrical, turrite, composed of many whorls, a large number of which are 
lost in the adult state, leaving a decollate, non-perforated upper end. Aperture 
protracted beyond the suture, circular or subquadrate, with continuous reflected peri- 
stome. Jaw very thin, striolate. Median tooth of the radula very small and narrow, 
not quite in a line with the laterals, these latter of a peculiar pickaxe-like form. | 
[Crosse, Journ. de Conch. xviii. p. 17, t. 3. figg. 6-18, and t. 4. figg. 1-6 (1870); Binney, 
Ann. N. Y. Acad. iii. p. 125, t. 14. figg. a, B (1884); Strebel, Beitr. Mex. Land- und 
Siissw.-Conch. iv. t. 13. figg. 6, 7, 8.] 
Characteristic of the West-Indian Islands—one species only falling within the 
limits of this work, this having been found on an island in the Caribbean Sea. 
1. Cylindrella bourguignatiana. 
Cylindrella bourguignatiana, Ancey, Ann. de Malae. ii. p. 243 (1886) *. 
Cylindrical, subfusiform, pale horn-coloured, with oblique, sharp, rib-like lamella, decollated ; remaining whorls 
9 to 10, the last a little narrower than the preceding, near the aperture produced into a crenulated keel, 
the aperture irregularly circular. Length of the decollate shell 114 millim., diameter 2, aperture 
9 millim. | 
Hab. Honvuras: Utila Island (Stmpson'). 
Unknown to me. According to the author, the species does not belong to the 
Mexican and Guatemalan group of Cylindrelle, but is strongly decollate, approaching 
C. pallida, Lansd. Guild., from St. Thomas. That species, however, in its general 
appearance, is not very distant from some of the Epirobie. 
