328 RISSOIA. 



R. DELICIOSA, Jeffreys. PI. 63, fig. 85. 



Narrowly rimate, somewhat thick, semipellucid, shining, white, 

 with curved, acute, distant costa3 and more numerous spiral lirse, of 

 which the basal ones are more distinct ; lip simple, thin, with ex- 

 terior varix. Length, 2 mill. 



Southern Europe. 



Jeffreys has indicated a var. multicostata. 



R. SYNGENES, Verrill. PI. 68, fig. 97. 



Imperforate, white, with 14-16 longitudinal, subdistant ribs, van- 

 ishing on lower part of body whorl, with closer spiral lirse, crossing 

 the ribs, and more conspicuous on the base ; there are also micro- 

 scopic, close spiral striae. Length, 3 mill. 



Off Cape Hatteras, N. C. 



R. FAYALENSIS, Watson. PL 67, fig. 72. 



Nearly imperforate, white, with about 12 narrow, nearly contin- 

 uous, distant, longitudinal ribs, fading below the periphery, some- 

 what remotely, feebly, spirally striate throughout ; whorls 5, con- 

 vexly conical, with linear, somewhat impressed suture; lip not vari- 

 cose. Length, 1'67 mill. 



Azores; 450-500 fins. 

 R. PYRRHIAS, Watson. PI. 67, fig. 70. 



Scarcely perforate, glossy, translucent white, with 13 strong, dis- 

 tant ribs, fading below, with distant, faint spiral striae throughout, 

 stronger on the base ; whorls 6, flatly conical, rapidly increasing, 

 suture slightly margined ; lip varicose. Length, 2*75 mill. 



Off Culebra Is., W. L ; :tt)<) fins. 



R. TRAJECTUS, Watson. PI. 67, fig. 78. 



Imperforate, strong, white, with about 18 narrow, rounded ribs, 

 stopping on the periphery, spirally lirate throughout, stronger on 

 the base ; whorls 5, slopingly, slightly convex, suture linear. 



Length, 1*5 mill. 



Off Cape York, Awtrufin. 



R. MICROSTOMA, Watson. PI. 67, fig. 75. 



Imperforate, translucent, glossy, white, with 10-12 distant, 

 rounded ribs, more or less continuous, microscopically spirally stri- 

 ate ; whorls 6, slightly convex, roundly angulated at the periphery ; 

 aperture very small ; lip varicose. Length, 3 mill. 



Off Culebra IsL, W. I., 390 fins. 



