8 BULLETIN 91, UNITED STATES NATIONAL MUSEUM. 



smooth, the third with two incised spiral lines, of which one is on the 

 middle of the space between the sutures, and the second halfway 

 between this and the summit of the succeeding turn. On the fourth 

 whorl the first incised spiral line falls at the posterior extremity of 

 the anterior fourth, while the other is halfway between it and the 

 summit of the penultimate whorl. The last whorl is free from spiral 

 sculpture. Aperture very much calloused ; outer lip very thick, with 

 a tooth a little posterior to the middle; parietal wall covered with 

 very thick callous, which assumes the shape of a very broad fold ; 

 columella also heavily calloused, provided with two strong, lamellar, 

 oblique folds, of which the first marks the anterior termination of the 

 columella, while the second is halfway between this and the parietal 

 callus. 



The unique type, Cat. No. 250404, U.S.N.M., comes from Port 

 Alfred (Coll. No. 1277). It has six whorls and measures: Length, 

 5.2 mm.; diameter, 3 mm. 



Family HYDATINIDAE. 



Genus HYDATINA Schumacher. 



HYDATINA PHYSIS Linnaeus. 



Cat, No. 186655, U.S.N.M., one specimen from Port Alfred (Coll. 

 No. 9). 



Genus CYLINDROBULLA Fischer. 



CYLINDROBULLA TURTONI, new species. 



Plate 38, fig. 2. 



Shell subcylindric, very thin, entire surface marked by many 

 irregular crack-like lines; very loosely coiled, with a strong sinus 

 extending over a little more than half a whorl at the summit of the 

 last turn. Apex depressed. Summit of the last whorl marked by 

 a decided shoulder, which shows very slender axial riblets. Aperture 

 very narrow, except at the somewhat truncated basal end, where it 

 appears almost circular. 



Two specimens of this species are in the collection of the United 

 States National Museum, both from Port Alfred. The type, Cat. 

 No. 227821, measures: Length, 8 mm.; diameter, 4.5 mm. (Coll. 

 No. 902a); the other specimen is Cat. No. 249790 (Coll. No. 1062). 



Genus VOLVATELLA Pease. 

 VOLVATELLA LAGUNCULA Sowerby. 



Three lots of this species are in the collection of the United States 

 National Museum, all from Port Alfred, as follows: Cat. No. 227807, 

 one specimen (Coll. Nc. 902). Cat. No. 249791, one specimen (Coll. 

 No. 1063). Cat. No. 250580, one specimen (Coll. No. 1453). 



