GUPPY : MOLLUSCA OF TRINIDAD. 219 



diameter lo mill. A shell belonging to the group of which 



B. poecilus Orb. is a member. It is certainly very near to 



B. viiuentinus which is distinguished from it by its expanded 



outer lip. I have described several varieties as follows : 



a typicus (yellow). 



ft albescens (white). 



7 fasciatus (banded). 



imperfectus (small banded). 



c rawsoni (dead white with yellow umbilicus and apex). 



The latter is figured in 'Amer. Journ. Conch.,' 1870, pi. 

 xvii., f. 6. It inhabits Tobago. 



22. Bulimulus vincentinus Pfeiff. 

 Crosse, i.e., p. 42, No. 18. 



A subperforate ovate-conic acuminate thin yellow white or 

 fivebanded shell with an expanded outer lip. Length 34 mill., 

 breadth 14 mill. 



This has varieties parallel with those of the last. 



23. Cylindrella trinitaria Pfeiff. 

 'Malak. Blatt.,' vol. vii., p. 213, pi. ii., f. 4 — 7. 

 Crosse, I.e., p. 43, No. 21. 



A slender cylindrical-turreted costulate-striate dark-brown 

 shell with a produced subquadrate aperture. Length 11 mill., 

 diameter 2\ mill. Nearest to morini Mor. and costata Guild. 

 It also inhabits Venezuela. 



24. Pupa uvulifera Guppy. 

 Crosse, I.e., p. 44, No. 22. 



A small ovate-cylindrical shell with 5 — 6 whorls and an 

 aperture furnished with teeth or plaits. Length 3 mill, 

 diameter i mill. It is very near to P. pelbicida Pf , a shell 

 widely distributed in the West Indies. 



I think it possible that the shell I described as Pupa 

 auriformis, and of which I never found more than a single 

 specimen, may be a variety or accidental form of this. 



