AJiT. IS SMALL. SHELLS DREDGED BY ALBATBOSS " DALL 117 



RISSOA SYNGENES Verrlll 



Cingula syngenes Verrill, Trans. Connecticut Acad. Sci., vol. 6, p. 2S0, 

 pi. 32, fig. 11, 1884. 



Off Fernandina, numerous. Off Cape Hatteras, N. C, in 142 

 fathoms, United States Fish Commission. 



RISSOA LJSTERA, new species 



Shell small, translucent white, glistening, with three yellowish 

 nuclear whorls and three subsequent, well-rounded whorls; suture 

 distinct, not deep; axial sculpture of more or less obsolete vertical 

 wrinkles stronger on the spire, not passing the periphery of the whorl, 

 and faint incremental lines; spiral sculpture of fine even striae, 

 stronger on the base, covering the whorl; base imperforate, aperture 

 obovate, the margin simple, not connected across the body. Height, 

 3 mm.; diameter, 1.5 mm. U. S. Nat. Mus. Cat. No. 333787. 



Off Fernandina, six specimens. 



This species groups with R. xanthias but is smaller, with trans- 

 lucent shell, feeble sculpture, and without a shoulder to the whorls. 



Subgenus CiNGULA Fleming 



RISSOA (CINGULA) CAMPTA, new species 



Shell small, translucent white, slender, with a glassy nucleus of 

 about two whorls and four subsequent well-rounded whorls, separated 

 by a deep suture; axial sculpture of numerous minute close-set ver- 

 tical riblets, hardly visible without a lens, crossed by microscopic 

 spiral striae over the whole surface; base rounded, imperforate, the 

 lips simple, not meeting over the body. Height, 3.6 mm.; diameter, 

 1.5 mm. U. S. Nat. Mus. Cat. No. 108403. 



Off Georgia, numerous, mostly stained brown by manganese. 



BISSOA (CINGULA) CANONICA, new species 



Shell small, smooth, opaque, white, with four well-rounded whorls, 

 including a smooth, not differentiated, nucleus and separated by 

 a, well-marked but not deep suture; sculpture only of more or less 

 feeble incremental lines; base evenly rounded, imperforate; aperture 

 subovate, not oblique, the margin simple, slightly thickened, not 

 complete in the young but in the adult united by enamel over the 

 body. Height, 2.5; diameter, 1.4 mm. U. S. Nat. Mus. Cat. No. 

 108094. 



Off Fernandina, numerous. 



It is possible that perfectly fresh specimens may be less opaque 

 than those here examined. 



