52 CYPE«A. 



centi; terrninis latis obtusissinris ; margine labii extus m- 

 crassato ; costellis teuuibus, penitus ad lineani dorsalem ex- 

 tensis, subdistantibus ; interstitiis planatis ; apertura lata; 

 columella, superne infiata, medio contracts, antice infiata, 

 concava, dentata ; linea dorsali lata, planata. 



185. ovula, Lamk., (f. 409, 410, 411).— C. testa forma C. 

 onisci simili, sed costellis obsoletis ; margine columellas et 

 labio solum dentatis ; cicatrice dorsali nulla. 



186. vesicularis, Gash., (f. 412, 413).— C. testa, C. onisci 

 simili, sed tenuiore ; costellis magis numerosis, approximatis, 

 ad dorsum vix interrupts ; columellas extremitatibus acutis, 

 distinctis. 



187. caenea, Gray, (f. 414, 415). — C. testa 0. onisci simili, 

 sed multo angustiore ; apertura baud tantum aperta ; costel- 

 lis super dorsum continuis ; cicatrice dorsali nulla. 



Note. — Oniscus, ovulate/,, vesicularis, rosea. In oniscus 

 the ribs do not meet at the back, but have a smooth dorsal 

 line between their ends. In vesicularis they are much 

 finer, and are scarcely interrupted at the dorsal line. Ovu- 

 late, is nearly smooth at the back. Eosea, which is more 

 ovate than the preceding, is of a very delicate rose tint, and 

 the ribs are not interrupted at the back by dorsal line or 

 groove. 



129*. Macandeei, Sowb., (f. 537, 538). — C. testa elongato- 

 ovata, ltevi ; extremitatibus productis, contractis, lateraliter 

 liratim foveolatis, depressis, medio callosis, margine sinistro 

 castaneo punctato liratim foveolato ; dorso subdepresso, 

 punctis albis minutis et ocellis fuscis castaneis majoribus 

 albo-punctatis rai-ioribus sparso; lateribus basique fulvis ; 

 basi subcomplanata, ad latera maculis rotundis numerosis 

 conspicuis ornata; apertura angusta,; dentibus 23 et 18, co- 

 lumellas medianis minutissimis, anticis acutis validis, promi- 

 nentibus incrassatis, labii acutis brevibus prope marginem 

 concinne castaneo lineatis. 



Note. — The characters of the aperture distinguish this 

 neat little shell from a variety of C. spurca, which it some- 

 what resembles. The mouth is narrow, the teeth are very 

 fine and sharp. In the middle of the columella they are 

 extremely minute, but a few anterior ones are prominent 

 and conspicuous. Those of the outer lip have neat lines of 



