RETUSA. 211 



Bulla umbilicata MONT., Test. Brit, (i), p. 222, pi. 7, f. 4. Oy- 

 liclma umbilicata FORBES & HANLEY, Hist. Brit. Moll, iii, p. 519, 

 pi. 114c, f. 8, 9. JEFFR., Brit. Conch, iv, p. 413 ; Ann. Mag. 1880, 

 p. 318. Utrieulus umbilicatus SARS., Moll. Reg. Arct. Norv. p. 286, 

 pi. 17, f. 14. Cylichna strigella LOVEN, Ind. Moll. Skand. p. 142. 

 Bulla blainvilliana Recluz and Volvaria subcylindrica Brown, 

 teste, JEFFR. Bulla truncatula PHIL., Enum. Moll. Sicil., i, p. 122, 

 pi. 7, f. 21 (not of Brug.). Cylichnina umbilicata Monts., Nom. 

 Gen. e Spec. p. 143. Cylichna (Cylichnina} umbilicata BUQ., 

 DAUTZ, & DOLLF., Moll. Rouss. i, p. 524, pi. 64, f. 6-8. 



This species is the type of Monterosato's genus Cylichnina. Dif- 

 fers from nitidula in being somewhat broader in proportion to its 

 length, and not so much attenuated behind, being spirally striated 

 instead of smooth, having frequently a conspicuous epidermis, in the 

 upper angle of the outer lip not being so prominent, the apical per- 

 foration being larger, and the columellar fold more distinct (Jeffr.'). 



R. CREBRISCULPTA Monterosato. PI. 27, figs. 7, 8. 



The form is as in R. umbilicata, but it is larger, solider, date- 

 shaped, the top more attenuated and profoundly umbilicated. The 

 sculpture is composed of vertical and spiral striae, which give it a 

 rough appearance (Monts.'). 



Palermo ; Naples ; Gulf of Gascony. 



Cylichnina crebrisculpta MONTS., Nomencl. Gen. e Spec. p. 143. 

 DAUTZENBERG, Mem. Soc. Zool. France, iv, p. 613, pi. 16, f. 1, 2. 



R. L^EVISCULPTA Granata. Unfigured. 



Shell of quite lengthened, subcylindroid form, contracted above ; 

 with very fine spiral striae ; summit truncated ; spire profoundly 

 and very narrowly umbilicated ; last whorl flattened above, rounded 

 at the base. Aperture narrow in the middle; columella with a 

 strong fold. Alt. 2-2 , diam. 11-H mill. (Locard.). 



Marseilles to Italy and Sicily ; Malta. 



Cylichna Icevisculpta GRANATA, Descr., etc., Nap., p. 11, 1877. 

 LOCARD, Coq. Mar. Fr. p. 27. Cylichnina Icevisculpta MONTS., 

 Nom. Gen. e Spec. p. 143. 



R. CROSSEI Buquoy, Dautzenberg & Dollfus. PI. 29, figs. 8, 9, 10. 



Shell 2 mill, high, 1 mill, wide, convoluted, thin, semipellucid, 



of an ovate form ; summit truncated, the spire sunken, having a 



very narrow and deep central perforation. Surface shining, a mi- 



