98 BULLETIN 181, UNITED STATES NATTONlAL MUSEUM 



The species appears to be confined to the north coast of St, Ann 

 and St. Mary Parishes. 



PTYCHOCOCHLIS LACTEOFLUVIALIS (Pilsbry and Brown) 



Plate 15, Figltres 4-6 



1910. Aperostoma (Ptycjiocochlis) lacteofluviale Pilsbht and Beown, Proc. Acad. 

 Nat. Sci. Philadelphia, 1910, p. 534. 



Shell rather small, helicoid, covered with a chestnut-brown perios- 

 tracum. The nucleus consists of a single well-rounded, smooth turn. 

 Postnuclear whorls inflated, strongly rounded ; the first marked with 

 mere protractively slanting incremental lines; the rest also show 

 incremental lines, which gradually increase in size, and form on 

 the last turn more or less sinuous, almost hairlike riblets. Beginning 

 with the second postnuclear whorl, weak, protractively slanting axial 

 wrinkles make their appearance, which do not extend to the pos- 

 terior third of the whorls and are best emphasized on the middle. 

 These wrinkles are about as wide as the spaces that separate them. 

 The wrinkles disappear on the last whorl, where indications of 

 spiral obsolete threads make their appearance. Suture very strongly 

 impressed on all but the last half of the last whorl, which is adnate. 

 Periphery well rounded. Base inflated, strongly rounded, openly 

 umbilicated, with a weakly developed cord marking the outer limit 

 of the umbilicus. The base has scarcely any indications of obsolete 

 nodules, but is marked by feeble spiral cords and incremental lines. 

 The umbilical wall is marked by rather coarse riblets and incremental 

 lines. Aperture decidedly oblique, strongly protracted to form an 

 angle at the posterior angle. Operculum typically ptychocochlid. 



The specimen figured, U.S.N.M. No. 356037, is one of a series of 

 specimens collected by C. B. Taylor at Round Hill, Milk River, Claren- 

 don Parish, Jamaica. It has 4.7 whorls and measures : Height, 12.5 

 mm. ; greater diameter, 16.5 mm. ; lesser diameter, 13.0 mm. 



The species seems to be confined to the Milk River region of south- 

 western Clarendon Parish. 



PTYCHOCOCHLIS SAVANNENSIS. new species 

 Plate 15, Figures 13-15 



Shell of medium size, depressed-helicoid, covered with a pale 

 chestnut-brown periostracum. The nucleus consists of a single well- 

 rounded, smooth whorl. The postnuclear whorls are inflated and 

 strongly rounded ; the first is marked by slender, closely spaced, hair- 

 like, retractively slanting axial riblets. The second postnuclear 

 whorl, in addition to slender riblike incremental lines, is marked by 



