THE CYCIjOPHORID LAND MOLLUSKS OF AMEiRICA 95 



expanded summit falling short of reaching the succeeding turns in 

 spots. 



The type, from Portland Parish, Jamaica, is one of the C. B. Adams 

 collection at Amherst College. It has 5 whorls and measures : Height, 

 19.0 mm. ; greater diameter, 27.0 mm. ; lesser diameter, 19.7 mm. 



This species resembles quite closely P. corrugata (Menke) but is 

 easily differentiated by its much less strongly developed sculpture and 

 the difference in the operculum noted. 



PTYCHOCOCHLIS SIMPSONI, new species 

 Pl.\te 14, FiGUBES 16-18 



Shell of medium size, helicoid, chestnut-brown with the cord at the 

 summit of the last whorl buff. The nucleus consists of a little more 

 than a single low, rounded, smooth whorl. The postnuclear whorls 

 are inflated and strongly rounded; the first one is marked by very 

 slender, slightly retractively curved, weak axial riblets. The second 

 postnuclear whorl shows the beginning of oblique protractive wrinkles 

 which do not quite extend to the summit. This sculpture continues to 

 the last half of the last turn, where it becomes irregular. The entire 

 surface is also marked by incremental lines of more or less irregular 

 strength. Suture strongly impressed on the early whorls, rendered 

 less conspicuous on the last turn by the appressed summit. Periphery 

 well rounded. Base narrowly umbilicated and marked with a mod- 

 erately strong cord at the outer edge of the umbilicus and a series of 

 feeble protractively slanting ridges adjacent to the umbilical cord, 

 which are separated by spaces about as wide as the ridges. The rest 

 of the base shows an indication of incised spiral lines. The umbilical 

 wall is marked by rather coarse incremental lines. Aperture circular, 

 large, protracted into an angle at the posterior angle; outer lip 

 thin, the inner thickened. Operculum typically ptychocochlid. 



The type, U.S.N.M. No. 535968, was collected by Henderson and 

 Simpson at Bog Walk, St. Catherine Parish, Jamaica. It has 4.8 

 whorls and measures : Height, 15.3 mm. ; greater diameter, 21.3 mm. ; 

 lesser diameter, 15.5 mm. 



Its smaller size and feebler sculpture will differentiate this species 

 from both P. corrugata (Menke) and P. adamsi. The species seems 

 to be confined to the region of Bog Walk. 



PTYCHOCOCHUS MARTENSI (Kobelt) 



Plate 14, Figures 1-3 ; Plate 42, Figueeb 8-10 



1912. Neocyclotus (Plectocyclotus) martensi Kobelt, Martini-Chemnitz Conchy- 

 lien Cabinet, vol. 1, sect. 19, pt. 3, p. 943, pi. 141, figs. 2-4. 



Shell large, helicoid, chestnut-brown ; interior of the aperture chest- 

 nut-brown. The nucleus consists of about one well-rounded smooth 



