CUBAN ANNULARIIDAE TORRE AND' BARTSCH 371 



the outer slightly expanded, broadest on the inner lip, forming a con- 

 spicuous auricle at the posterior angle; the inner reflected and adnata 

 to the outer at the middle of the outer wall, falling a little short of 

 being coextensive with the outer on the basal wall, and only about 

 half as wide on the inner lip and forming an inconspicuous curved 

 shelf at the posterior angle. Operculum typically annularid. 



The specimen described and figured, U.S.N.M, No. 356340, a cotype, 

 is one of 6 collected by Gundlach at Yateras, northeast of Guantdnamo, 

 Oriente Province, the type locality. It has 4.0 whorls and measures: 

 Length, 8.0 mm.; greater diameter, 9.2 mm.; lesser diameter, 7.0 mm. 



This species varies considerably in size, a large specimen having 4.5 

 whorls measures: Length, 10.2 mm.; greater diameter, 12.7 mm.; 

 lesser diameter, 9.5 mm. 



ANNULARIA (ANNULARELLA) HEYNEMANNI (Pfeiffer) 



Plate 50, Figures 1-3 



1S64. Cyclostomus heynemanni Pfeiffer, Malakozool. Blatter, vol. 13, p. 105. 

 1867. Cyclostoma heynemanni Arango, Repert fisico natural Isla de Cubana, 



vol. 2, p. 75. 

 1890. Colobostylus heynemanni Crosse, Journ. Conchyl., vol. 38, p. 302 in part. 

 1920. Tudora (Tudorellata) heynemani Henderson and Bartsch, Proc. U. S. 



Nat. Mus., vol. 58, p. 75. 



Shell conic, pale straw colored; peristome white; interior of aperture 

 yellowish white. Nuclear whorls almost 2, well rounded, microscopi- 

 cally granulose, except for the last portion of the last turn, which 

 shows the beginning of the postnuclear sculpture. Postnu clear whorls 

 very strongly inflated, the first one marked by 72 rather distantly 

 spaced, decidedly retractively slanting axial riblets; on the second 

 whorl intercalated finer threads make their appearance between the 

 stronger riblets. This type of sculpture attains its maximum develop- 

 ment on the last turn; the second has 120 of the stronger riblets, and 

 the last 92. On this the finer riblets between the stronger threads 

 vary from 2 to 9 in number; the stronger riblets are shghtly expanded 

 into auricles at the summit. Suture narrowly and weakly channeled. 

 Periphery of the last whorl well rounded. Base short, openly umbili- 

 cated, well rounded, marked by the continuation of the axial sculp- 

 ture and by a rather strong spiral cord posterior to the junction of the 

 basal wall with the umbiHcus; the latter place is marked by a strong 

 spiral cord; within the umbihcus 7 additional, rather strong, spiral 

 threads and the closely approximated, somewhat enfeebled continua- 

 tion of the axial riblets are present. Aperture broadly oval ; peristome 

 double, the inner and outer both expanded and reflected and almost 

 coextensive. The operculum is annularid but it has the lamella 

 quite flattened, with a space separating the succeeding turns. 



223580 — 40 16 



