640 



spots iu rays ; anterior side rather acuminated, with the lunule 

 distinct, rather Hat, and having a bright-purple spot close to tlie 

 umbones; posterior side with the dorsal margin sloped, and 

 presenting a variegated area enclosed by a scarcdy elevated keel. 

 Locality unknown. Mus. Hanley. 



96. Cyther^a bullata (pi. cxxxvi. f. 192), Sowerhy,jim. 



Cyth. testa oblongo-subquadrata, alba, tenui, concentrice sub- 

 striata, ventricosa ; umbonibus inflatis ; latere antico breve sub- 

 acuminato, superne subexcavato, lunula distincta ; latere postico 

 quadrato, subangulato, margine dorsali declivi, margine ventrali 

 rectiusculo. 



Shell white, oblong, ventricose, thin, smooth, with the um- 

 bones large and inflated ; the front side small and almost acumi- 

 nated ; the hinder side somewhat quadrate and angular ; the 

 ventral edge rather straight, and the dorsal edge sloped. 



Locality unknown. Mus. Sowerbj/. 



97. Cyther^a Venetiana (pl.cxxxvi. f. 197, 198, 199), La- 

 marck, Anim. s, vert. Ci/tJi. no. 35. 



Cyth. testa subovali, ventricosa, Isevi, albida, fusco varie picta; 

 lunula et area dorsali rubro maculatis ; latere antico brevi, lunula, 

 distincta ; latere postico subdeclivi, subrotundato. 



Shell of a rather short oval form, very ventricose, smooth, 

 wliitish, variously marked with brown; the anterior side short, 

 with the lunule defined, reddish, and covered with reddish- 

 brown markings; dorsal margin sloped, with a reddish area 

 marked with reddish-brown. 



Mediterranean. 



98. Cyther^a limatula (pi. cxxxvi. f. 200, 201), 8owerhj, 

 junior. 



Cyth. testa oblonga, subveutricosa, polita, paUide lutea, maculis 

 fuscis angulatis seriatim positis hinc et liinc radiata ; latere antico 

 brevi, lunula distincta, partim fusco picta; latere postico sub- 

 quadrato ; area dorsali fusco picta ; margine ventrali rectiusculo. 



Shell more quadrate than C. Venetiana, with the ventral margin 

 nearly straight, a peculiar smoothness of surface, with very dark 

 chestnut-brown on the dorsal area and also covering part of the 

 lunule with a ragged edge. 



Locality unknown. Mus. Ranley. 



