120 PROCEEDINGS OF THE NATIONAL MUSEUM vol.70 



SINUM, sp. Indet. 



The apical fragment of a species of Sinum was obtained off Fernan- 

 dina. The surface is smooth, and it is probably the young of one of 

 the known species. U. S. Nat. Mus. Cat. No. 108110. 



Genus MEGALOMPHALUS Brusina, 1871 



Macromphalina Cossmann, 1888; Adeorbis, species Jeffreys, 1885; Fossarus, 

 Bpecies Seguenza. 1874; Gyrodisca Dall, 1895. 



MEGALOMPHALUS CARO, new species 



Shell minute, whitish, of about two and one-half well-rounded 

 whorls; nucleus minute, glassy; suture deep, not channeled; axial 

 sculpture of rather obvious incremental lines; sphal sculpture of three 

 or more rather sharp grooves near and in front of the periphery; base 

 widely funicular; aperture oblique, wide, the margins thin, simple; a 

 thin film of callus over the body; the periphery of the basal funicle 

 almost carinate, the axis perforate minutely. Height, 1 mm.; diam- 

 eter, 1.2 mm. U. S. Nat. Mus. Cat. No. 108103. 



One specimen off Fernandina. 



The small size and the spiral grooving distinguish this species from 

 any of the others so far described. 



Genus VETULONIA Dall, 1913 



VETULONIA JOSEPHINAE, new name 



Trochns cancellata Jeffreys, Proc. Zool. Soc. London for 1883, p. 96, pi. 20, 

 fig. 4 (not of Roemer, 1835), Josephine Bank. 



Off Georgia and Fernandina, rare. 



The specimens have been compared with Jeffreys's type. 



VETULONIA DENSELIRATA, new species 



Shell resembling josephinae but with depressed, almost flat spire, 

 about 35 axial lamellae on the last whorl, the spiral sculpture finer 

 and closer, and the aperture almost circular with continuous margin. 

 Height, 2 mm.; diameter, 3 mm. Cat. No. 108116, U. S. N. M. 



Two specimens off Fernandina. 



Genus MOLLERIOPSIS Bush, 1897 



MOLLERIOPSIS SINCERA Dall 



Adeorbis sincera Dall, Proc. U. S. Nat. Mus., vol. 12, p. 338, pi. 12, fig. 2, 



1889. 

 Molleriopsis sincera Bush, Trans. Conn. Acad. Sci., vol. 10, p. 138, 1897. 



Off Georgia and Fernandina, abundant. 



