60 BULLETIOS" 181, UNITED STATEIS NATTOOSnAiL MUStEUM 



Height, 13-13.5 mm.; diameter, 19.5-20.5 mm.; height of ajDerture, 

 9.5-10.5 mm.; diameter, 8.5-9.5 mm. Habitat, Rio Blanco, in the 

 Sierra de Caduros, Puerto Rico. 



Boettger says he had before him seven specimens sent to him by 

 Otto Goldfuss. 



I have not seen this species and have freely translated Dr. Boett- 

 ger's description and copied his figures. 



It is related to A. (A.) guadeloupensis, A. {A.) mineri, and A. (A.) 

 liratus (Drouet). The strong lirations of the base will distinguish 

 it from the first two; it is easily differentiated from the last by its 

 much larger size. 



Cycloblandia, new subgenus 



Amphicyclotulv.s in which the whorls, even the early postnuclear 

 turns, are without raised spiral cords or threads. 



Type : Cyclostoma heauiana I'etit= Amphicyclotulus {Cycloblandia) 

 heauianus (Petit). 



We know this subgenus from Guadeloupe, Grande Terre, Dominica, 

 and Martinique. 



The anatomy of A. {Cycloblandia) a/methystinus (Guppy) shows 

 the radula to have the formula 3:3:3:3, and the jaw without median 

 projection. The verge is on the back of the neck behind the tentacles, 

 and traversed by a vas deferens. The terminal appendage is long and 

 threadlike, almost as long as the basal portion. 



KEY TO THE SPECIES OF SUBGENUS CYCLOBLANDIA 



Shell large, greater diameter more than 15 mm amethystinus 



Shell smaU, greater diameter less than 12 mm beauianus 



AMPHICYCLOTULUS (CYCLOBLANDIA) AMETHYSTINUS (Guppy) 



Plate 11, Figures 1-3 

 1868. Cyclotus amethystinus Guppy, Ann. Mag. Nat. Hist., ser. 4, vol. 1, p. 433. 



Shell large, depressed-helicoid, covered by a pale olive periostracum. 

 Nuclear whorls 1.8, well rounded, smooth. Postnuclear whorls inflated, 

 strongly rounded, marked by fine incremental lines, which vary some- 

 what in strength and by inconspicuous hair lines a little darker than 

 the general coloration of the shell. In cross section the whorls are 

 rather inclined to oval than circular. Suture well impressed, particu- 

 larly so on the early turns. Periphery strongly rounded. Base not 

 inflated, well rounded, marked by incremental lines equaling those on 

 the spire, which on the last portion of the last whorl become intensi- 

 fied. Aperture oblique, almost circular ; peristome simple. Operculum 



