42 cypktra. 



Note. — In arranging the species according to their nearest 

 affinities, it is difficult to find a place for this beautiful ring- 

 painted shell, which, notwithstanding some general resem- 

 blance in form to cicercula, etc., presents a complete contrast 

 to that species in the obtuseness of the closely converging 

 extremities. 



B. No lobe or plait at end of columella. Dorsal ribs radia- 

 ting from central line. 



Subgenus Trivia. 

 * Narrow aperture, broad outer Up. 



14G. radians, Lamk., (f. 420, 421, 422).— C. testa ovato- 

 subglobosa, fusco-grisescenti vel subrosea ; margine dilatato ; 

 dorso subdejoresso, medio macula magna notato ; sulco me- 

 diano lato ; costellis dorsalibus obscure lentiginosis, validis 

 distantibus, utrinque circa 10 ad sulcum in nodulos elevatos 

 terminantibus, circa 7 intermediis ad latera desinentibus ; 

 basi subplanulata, costellis dentalibus et paucis intermediis 

 validis, ad margines extensis ; apertura, latiuscula ; extre- 

 mitatibus retusis ; sulco columellari angusto dentato. 



147. Solandri, Gray, (f. 418, 419). — 0. testa G. radianti 

 affini ; dorso magis elevato ; lateribus baud tantum dilatatis ; 

 basi magis convexa ; labii margine interno dentibus inter- 

 stitialibus plurimis armato ; nodulis costellarum minoribus. 



148. costis-punctata, Gask., (f. 452,453). — C. testa C. ra- 

 dianti affini, costellis conspicue lentiginosis, maculis dorsali- 

 bus plurimis, sulco angustiori ; lateribus haud tantum dila- 

 tatis ; basi rotundo, sulco columellari lato. 



149. depauperata, Sowb., (f. 423, 424). — C. testa G. radi- 

 anti affini, depresso-g'lobosa, pallida, immaculata. ; costellis 

 dorsalibus perpaucis, in sulcum medianum angustatum alter- 

 natim desinentibus, quarum plurimis prope sulcum tumi- 

 diusculis. 



Note. — Radians, Solandri, costis-piunctata, depauperata. 

 The back of Solandri is much more elevated, and the sides 

 not so much spread, as in radians. The base is rounder and a 

 few short intermediate teeth on the inner edge of the outer 

 lip, cause it to appear much more closely serrated. Gostis- 

 punctata also has a rounded base, but in other respects more 



