THE CYCLOPHORID LAiND MOLLUSKS OF AMERICA 103 



with the posterior angle produced into a decided angulation. Outer 

 lip of the peristome thin, the inner lip somewhat thickened. Oper- 

 culum typically ptychocochlid. 



The type, U.S.N.M. No 535973, is one collected by Orcutt at Worthy 

 Park, 1 mile from Luidas Vale, St. Catherine Parish, Jamaica. It has 

 4.9 whorls and measures: Height, 18.9 mm.; greater diameter, 25.7 

 mm.; lesser diameter, 19.1 mm. 



The species appears to be confined to St. Catherine Parish, where 

 it is rather widely distributed. 



PTYCHOCOCHLIS SUBGLOBOSA, new species 



Plate 15, Fiq-oees 1&-18 



Shell of medium size, helicoid, covered with a dark chestnut -brown 

 periostracum. There is an indication of a lighter zone at the appressed 

 summit of the last whorl. The nucleus consists of 1.2 well-rounded, 

 smooth whorls. The postnuclear whorls are inflated and strongly 

 rounded; the first is marked with fine, retractively slanting, closely 

 spaced, hairlike riblets, which become somewhat strengthened on the 

 succeeding turns and appear as low lamellae on the last whorl. Begin- 

 ning with the second postnuclear whorl, the upper side of the turns is 

 marked with irregularly developed and disposed weak low nodulations, 

 which lend to the surface a somewhat rough and malleated aspect. 

 Suture strongly impressed except on the last whorl, the summit of 

 which is appressed to the preceding turn, which causes the suture to be 

 less pronounced. Periphery well rounded. Base inflated, well 

 rounded, openly umbilicated with a strong broad rounded keel at the 

 outer edge of the umbilicus. This keel is decidedly notched and has a 

 number of not very deep, somewhat protractively, obliquely directed 

 indentations outside of it. The rest of the base is slightly malleated 

 and shows low obsolete spiral threads. The umbilical wall is marked 

 by strong lines of growth. Aperture circular, protracted at the pos- 

 terior angle into an angulation. Operculum typically ptychocochlid. 



The type, U.S.N.M. No. 398910, is one of a series of specimens col- 

 lected by Orcutt on the east side of Ferry River above Kingston on the 

 Spanish Town road, St. Andrew Parish, Jamaica. It has 5 whorls 

 and measures: Height, 15.7 mm.; greater diameter, 19.8 mm.; lesser 

 diameter, 14.3 mm. 



The species ranges through St. Catherine and St. Ann Parishes. 



PTYCHOCOCHLIS CAMPEACHYI (H. B. Baker) 



Shell small, helicoid, covered with a chestnut-brown periostracum ; 

 interior of the aperture pale brown. The nucleus consists of about 1.2 

 well-rounded, smooth whorls. The postnuclear whorls are inflated and 



