RISSOIA. 361 



R. AREOLATA, Stimpson. PI. 68, fig. 83. 



Clathrate by rather distant, narrow longitudinal and spiral ribs ; 

 whorls 7, convex, with deep suture ; lip simple. Length, 3'5 mill. 



New England. 

 R. ACUTELIRATA, Carp. PI. 66, fig. 41. 



Thin, brownish ash-color, with about 18 longitudinal, distant 

 ribs, vanishing on the periphery, crossed by distant spiral lirse (15 

 on last whorl), not nodose ; whorls 6, rapidly enlarging, convex, 

 with well-impressed suture. Length, 2'25 mill. 



San Diego, Gal. 

 R. LANCOC, Calcara. PL 63, fig. 83. 



Yellowish, orange brown or yellowish white ; longitudinally dis- 

 tantly costate, spirally lirate, forming nodules on the ribs, base 

 without ribs, but spirally striate ; whorls 5-6, very convex, suture 

 deep, channeled ; lip externally thickened. Length, 4 mill. 



Mediterranean Sea. 



R.scaura, Monts., and R. Schwartzii, Benoit, are synonyms. 



R. RETICULATA, Mtg. PL 65, fig. 9. 



Imperforate, solid, almost opaque, yellowish or yellowish brown, 

 sometimes indistinctly bifasciate, reticulated by numerous, curved, 

 narrow ribs, and very distinct spiral lirse ; whorls 6-7, slightly 

 convex, suture narrowly excavated ; lip plicate within, with a 

 striated external varix. Length, 4 mill. 



Europe. 



The synonymy includes R. textilis, Phil., R. Broechii, Weink., R. 

 Beanii, Forbes and Hanley. 



R, FISCHERI, Jeffreys. PL 65, fig. 31. 



Imperforate, opaque, not shining, reticulated by equal, narrow, 

 distant longitudinal and spiral riblets, light yellowish or whitish ; 

 whorls 5, moderately convex, with deep suture ; lip rather thin, not 

 varicose, smooth within. Length, 2*5 mill. 



Mediterranean Sea, Portugal. 



R. JEFFREYSI, Waller. PL 66, fig. 56. 



Whitish or fulvous, with prominent spiral lirse, decussated by 

 less elevated longitudinal sculpture, which becomes obsolete on the 

 base ; whorls 5, convex, subangulate, suture deep, channeled ; lip 

 scarcely varicose. Length, 3*5 mill. 



North Sea, Mediterranean. 



It is .R. sororcula, Granata. 



