64 BULLETIN 181, XmiTEO SfTATES NATTONIAL MUSEfUM 



the first spiral cord below the suture, which undoubtedly when closed 

 by the operculum leaves a breathing space. Operculum typically 

 crocidopomid. 



This subspecies has a rather wide range along the coast of the 

 southern peninsula. We have many specimens, from many stations, 

 ranging from Port-au-Prince around the end of the island, down 

 the south coast to near Aquin, to some of the outlying small islands 

 of the region. Throughout this range the shells are fairly constant, 

 differing, however, materially in size in the individual colonies and 

 also in the amount of solution with the last turn. In an exceedingly 

 large old individual this may extend over considerably more space 

 than in those not quite so big. Specimens collected by Henderson and 

 Simpson at La Ferrier, Haiti, U.S.N.M. Nos. 162982 and 490072, and 

 by W. L. Abbott at Sosiia, Dominican Kepublic, U.S.N.M. Nos. 

 336766 and 336788, both near the north coast of Hispaniola, are indis- 

 tinguishable from those of the south peninsula. 



The specimen that has served for my description and figure, 

 U.S.N.M. No. 403073, comes from the type locality, a little west of 

 Jeremie. It has 4.1 whorls and measures : Height, 6.7 mm. ; greater 

 diameter, 11.8 mm. ; lesser diameter, 9.0 mm. 



A very large specimen from Anse du Clerc, Dept. du Sud, U.S.N.M. 

 No. 401741, has 4.6 whorls and measures: Height, 9.9 mm.; greater 

 diameter, 14.2 mm. ; lesser diameter, 9.8 mm. 



CROCIDOPOMA (CROCIDOPOMA) VORTEX ELEVATUM, new subspecies 



Plate 11, Figukes 1&-18 



This subspecies agrees completely in its sculpture with the typical 

 form. It differs materially from it, however, in being much more 

 elevated and in having the keel at the summit much more closely ap- 

 proximated to the preceding turn, thus making the channeled suture 

 much narrower. The specimens were collected on top of Mount 

 Rochelois. 



The type, U.S.N.M. No. 535846, was collected by W. J. Eyerdam and 

 measures: Height, 8'.9 mm.; greater diameter, 12.4 mm.; lesser di- 

 ameter, 9.9 mm. 



CROCIDOPOMA (CROCIDOPOMA) FLOCCOSUM (Shnttleworth) 



Pi^TE 12, Figure 16 



1857. Cyclostoma (Cyclotus) floccosum Shuttleworth, Journ Conchy!., vol. 5, 



pp. 268, 272. 

 1863. Cyclotus floccosus Ree:\'e, Conchologia iconica, vol. 14, sp. 48. 



Shell broadly umbilicated, depressed, thin, with incremental hair 

 lines and closely spaced, slightly nodulose, spiral keels, which alternate 



