332 RISSOIA. 



three or four spiral series of pits ; aperture expanded below, lip di- 

 lated, varicose ; whitish or yellowish, often strigate with chestnut, 

 varix sometimes three-spotted with chestnut. Length, 7'6 mill. 



Mediterranean Sea. 



Readily distinguished by its Clausilia-like appearance. The 

 synonyms are R. marginata, Laskey, R. acuta, Desm., R. acicula, 

 Desm., R. Drummondi, Leach, R. pulchella, Risso, R. latilabre, Jan, 

 and var. expansilabris, Bucq., Dautz., Dollf. 



R. SISMONDIANA, Issel. PL 67, fig. 69. 



Imperforate, thin, whitish, a little shining ; longitudinally densely 

 costulate, the interstices minutely spirally striate ; whorls 9, slightly 

 convex, suture margined ; lip acute. Length, 2*5 mill. 



Suez, 



Section TURBELLA, Leach. 1847. 



R. PARVA, DaCosta. PL 62, figs. 46-48. 



Rather solid, smooth, shining, white or yellowish, variously 

 clouded and irregularly banded with fulvous; with narrow, sub- 

 distant longitudinal rounded ribs, terminating abruptly on the 

 middle of the body whorl, the intervals spirally striate ; lip with a 

 white varix, bearing two fulvous spots. Length, 4*3 mill. 



Europe. 



The synonyms are Turbo albulus, cereus and subhiteus, Adams, 

 R. cerasina, Brusina, R. obseura, Phil., R. semieostiilata, Anton. 



R. INTERRUPTA, Adams. PL 62, figs. 49, 50. 



Thin, nearly pellucid, smooth, somewhat shining, with two inter- 

 rupted irregular chestnut bands and intermediate chestnut flames, 

 lip maculate with chestnut. Length, 4'3 mill. 



Europe. 



By some authors considered a variety of R. parva. It is R. 

 Matoniana, Recluz. 



R. DOLIUM, Nyst. PL 62, fig. 51. 



Hyaline, shining, whorls 5, rapidly increasing, with deep suture, 

 with 14 plicae and intermediate sulcations, abruptedly terminating 

 on the periphery of the last whorl; lip scarcely varicose. 



Length, 2'3 mill. 



Mediterranean Sea. 



It is R. pusilla and R. nana, Phil., R. pulchra, Forbes. 



