68 BXJLIiETIDSr 181, UNTTE© SITATEIS NlATTONlAiL MUSlETJM 



quely placed shingles. These fimbriations therefore are not merely a 

 cutting up of the expanded basal chondroid plate, but they represent in 

 a measure a decidedly folded and cut feature. These fimbriations on 

 the outer whorl are also somewhat fluted. They are as thin as tissue 

 paper and unless very carefully handled might easily be destroyed. 



Type: Cyclostoma suturale Sowerhy =Ci/cloj(miaicia mturdlis 

 (Sowerby). 



The genus is confined to Jamaica. 



The radulae of Cyclojamaicia hondi (Vanatta) and G. suturalis 

 CSowerby) show the formula 3:3:3:3. The jaw of C. londi is with- 

 out median projection. The verge of both is situated on the back of 

 the neck behind the tentacles and is swollen basally. It is traversed 

 by a seminal groove only. The terminal appendage is very short and 

 appears almost chitinized and is shaped like a single turn of the tip 

 of a wood screw. 



KEY TO THE SPECIES OF GENUS OYCLOJAMAICIA 



Sutural channel wide bondi 



Sutural channel narrow suturalis 



CYCLOJAMAICIA BONDI (Vanatta) 



Plate 12, Figures 7-9 

 1936. Poteria {Crocidopoma) hondi Vanatta, Nautilus, vol. 49, pp. 98-99. 



Shell lenticular, very broadly umbilicated, covered with a brownish 

 wax-colored periostracum. Nuclear whorls about 1. Postnuclear whorls 

 strongly rounded, the first without a keel at the summit, the rest with 

 the strongly rounded keel at some distance from the preceding turn, 

 which leaves a broadly channeled suture between that and the keel. 

 The postnuclear whorls are marked by very closely spaced, hairlike, 

 sublamellar axial riblets. In crossing the keel at the summit these 

 become decidedly backward bent. Periphery well rounded. Base well 

 rounded, marked like the spire. Aperture circular with a notch at the 

 posterior keel as in Cycle jamaicia suturalis (Sowerby). Operculum 

 as described in the generic diagnosis. 



The specimen figured is one of a series, U.S.N.M. No. 399392, collected 

 by Charles R. Orcutt at Retreat, 1 mile west of Great House, St. Ann 

 Parish, Jamaica. It has 4.2 whorls and measures : Height, 6.1 mm. ; 

 greater diameter, 13.0 mm. ; lesser diameter, 9.5 mm. 



We have 22 lots of this species in the collection of the U. S. National 

 Museum, which range from Stewart Town in a curve east to Moneague 

 in St. Ann Parish. 



