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Synopsis of classification of species and varieties of Cylindrella in- 

 habiting Jamaica. 



The scheme is modified from Dr. Pfeiffer's. 

 Geomelaniform ; 5 — 6* 

 Clausiliaeform ; 7—18; 

 sinistrorsal ; 7 — 9 ; 

 dextrorsal; 10—18; 

 smooth; 10 ; 

 costulate; 11—12; 

 striate; 13 — 18. 

 Pupaeform; 19—29; 



aperture produced, cylindrical; 19 — 22 ; 



'' " , spreading; 23 — 26; 



aperture not produced ; 27 — 29. 

 Fusiform ; 30—32 ; 

 polished ; 30 ; 

 not polished ; 31 — 32. 

 Bulimiform ; 33. 

 Columnar ; 34 — 38. 



AcHATiNA PROCERA. Shell conic, much elongated ; white, more 

 or less tinged with brown, with rather broad dark brown somewhat 

 obhque stripes, which are waved on the posterior margin, interrupted 

 at the middle of the last whorl, and of which there are four or five 

 on each whorl, except on the first three or four which are colorless ; 

 varicose coincidently with the brown stripes on the last whorl, like 

 A. leucozonias with closely set very coarse transverse stride or ribs ; 

 spire with the outlines nearly rectilinear ; apex rather obtuse ; whorls 

 about ten, rather convex, with a slightly channeled suture ; aperture 

 rather narrow, quite acute above ; labrum rather sharp, produced to 

 an extraordinary degree in the middle, and then abruptly retreating 

 in a deep well rounded sinus, which reaches to the twisted and much 

 arcuated columella. 



Mean divergence 27°; length 1.375 inch; breadth .4 inch ; length 

 of aperture .52 inch. Of another individual, mean divergence 31® ; 

 length 1.08 inch ; breadth .395 inch ; length of aperture .44 inch. 



* These numbers refer to a catalogue of the Jamaica Helicidae, which Avill fol- 

 low the descriptions of species. 



