36 CYPRflA. 



super basim utrinque extensis, hinc illic bifurcatis ; colu- 

 melke medio in larninani incrassatam conjunctis, verius ex- 

 tremitates utrinque prominentibua. 



Note. — The dorsal view of this remarkable shell beara a 

 singular resemblance in form to Lamarckii, or rather eburnea, 

 although it is much larger and more boldly sculptured at the 

 ends ; but, on a view of the base, it is at once perceived that 

 the species is one of those that stand quite alone. The 

 singular manner in which the chestnut-coloured teeth are 

 continued over the base and margins, and collected into a 

 thickened irregular sort of platform in the middle, is not 

 even suggestively approached in any other species. 



121. Lamarckii, Gray, (f. 106, 107). — C. testa pyriformi, 

 crassiuscula, inflata; dorso fulvo, maculis rotundis albis 

 quarum nonnullis punctis centralibus ocellatis numerosis 

 asperso ; lateribus castaneo punctatis ; extremitatibus litis 

 fuscis elevatis crenulatirn-foveolatis ; basi alba ; apertura 

 lata, sinuata, antice subexpansa, intus purpurascente ; denti- 

 bus circa 16 et 18 angustis, solidiusculis, interstitiia latis; 

 extremitatibus acuminatis. 



122. miliaris, Gmel., (f. 109). — C. testa, C. Lamar ckiance 

 affini, angustiori, semper immaculata ; dorso fulvo-subviridi, 

 albo perfoi'ato. 



123. eburnea, Barnes, (f. 108). — C. testa C '. Lamarckian.ee 

 affini, magis conspicue producta, umbilicata, foveolata, et 

 dentata, semper alba, immaculata. 



Note. — Lamarckii, miliaris, eburnea. Probably varieties of 

 the same species, but constant and decided enough to be 

 usefully distinguished. No intermediates have been met 

 with. Coincidently with the difference as to colour, it may 

 be observed that eburnea is always more conspicuously um- 

 bilicated, produced and sculptured at the sides than La- 

 marckii. Miliaris is not only never spotted at the sides or 

 ocellated at the back, but is constantly of a narrower form. 



124. ocellata, Linn. (f. .102, 103, 243).— C. testa, ovato- 

 depressa, brevi ; lateribus incrassatis, expansis, reflexis, ex- 

 tremitates versus crenulato-foveolatis ; dorso rufescente, ocel- 

 lis numerosis albis quorum nonnullis hie illic nigro-pupillatis 

 ornato ; basi lateribusque albidis, fusco punctatis ; apertura 

 flexuosa ; dentibus columella3 crassiusculis, labii acutis sub- 

 elongatis, castaneo lineatis. 



