104 BULLOETEN 181, tTNITED ST ATE® NlATTO!NlAiL MUSEUM 



strongly rounded. In one of the subspecies, P. c. fetricola^ the first 

 nuclear whorl is marked by very coarse, distantly spaced axial ribs. 

 In the typical race the axial riblets are fine and less strongly developed. 

 The succeeding whorls are slightly malleated, almost smooth, and 

 marked with lines of growth. Suture strongly impressed except on 

 the last turn, which is appressed to the summit. Periphery well 

 rounded. Base narrowly umbilicated with a limiting keel at the outer 

 edge of the umbilicus. The rest of the base is marked like the upper 

 surface of the last whorl, that is, it shows the lines of growth and 

 obsolete malleations and indications of spiral threads. The umbilical 

 wall is marked by incremental lines. Aperture subcircular, decidedly 

 oblique, decidedly protracted into an angle at the posterior angle; 

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

 culum typically ptychocochlid. 

 I am recognizing two subspecies : 



KEY TO THE SUBSPECIES OF PTYCHOCOCHLIS CAMPEACHYI 



Early postnuclear whorls strongly axially ribbed petricola 



Early postnuclear whorls feebly axially ribbed campeachyi 



PTYCHOCOCHLIS CAMPEACHYI PETRICOLA. new subspecies 



Plate 15, Figures 22-24 



This subspecies appears confined to the southern part of St. Andrew 

 Parish, Jamaica. It is differentiated from P. c. campeachyi (H. B. 

 Baker) by having the first postnuclear whorl provided with strong 

 axial ribs. It is also larger than that subspecies. 



The type, U.S.N.M. No. 535947, comes from Stony Hill, St. Andrew 

 Parish, Jamaica. It has 4.5 whorls and measures : Height, 12.8 mm. ; 

 gi-eater diameter, 16.6 mm. ; lesser diameter, 12.8 mm. 



PTYCHOCOCffLIS CAMPEACHYI CAMPEACHYI (H. B. Baker) 



Plate 15, Figtjbes 19-21 



1934. Poteria varians campeacliy,i H. B. Baker, Nautilus, vol. 48, pp. 61-62, 

 figs. 5, 19, 22. 



This is the smaller of the two subspecies, which ranges through the 

 central portion of St. Catherine Parish. It is distinguished from P. c. 

 petricola by its smaller size and weak axial ribs on the first postnuclear 

 turn. 



The type, Acad. Nat. Sci. Philadelphia No. 139611, was collected by 

 Dr. H. B. Baker near Campeachy Gully Marsh on the northwest side 

 of Port Henderson Hill, St. Catherine Parish, Jamaica. It has 4.8 

 whorls and measures : Height, 12.2 mm. ; greater diameter, 15.2 mm. ; 

 lesser diameter, 11.3 mm. 



