ii i POP1 i i i: \. 

 of the central RFCM llieiv an- li tinr row- of h-ads nnt 



developed ; jugular araai not defined ; -idr areai u ith in 



larly >cattetvd grains. Mucro central, d-pi .--( <!. 



Length - s , breadth 17 mill. 



< 'arpenter seem- di-po-cd to unite to Columbian.*;.* tin- -pecies 

 described as ncnhr'n-nlun and luritlii*, the former of these two being 

 leaB, the latter more beaded than the typical fiolumbittufa In case 

 this view is correct, columbiensis will fall into the synonymy of 

 luridut. 



C. ISABELLEI d'Orbigny. PI. 13, i\^<. ">", 58. 



Shell oblong, brown ; back carinatcd ; front valve and lateral 

 areas of the intermediate valves radiutel}' granulate; central treat 

 longitudinally granulose-striate. Length 22 mill. (Orb.) 



9 Bay of San Bias, Patay<> 



Chiton isabellei ORB., Voy. dans 1'Amer. Mr rid. p. 488, t. ;:>, f. 

 14-1!). Tonicia isabellei ROCHEBR., Cap Horn, p. 138. Chceto- 

 pleura isabellei CPR. MS. 



Allied, by its granulated strife, to C. peruvianus, but narrower, 

 more carinated, the girdle smooth. ( Orb.*) 



The gills are figured as continuing almost to the front end of the 

 foot. In the absence of any information regarding the insertion 

 plates it is impossible to say whether this species is a Tmnriit or a 

 Ckcetopleura ; if the latter, the girdle is probably not truly smooth. 

 In sculpture it seems near to columbiensis and its allies. 



C. DIEFFENBACHII Reeve. PI. 13, figs. 65, 66. 



Shell somewhat elongately ovate ; valves covered with very min- 

 ute raised dots; lateral areas scarcely raised ; posterior valve umho- 

 nated ; variegated with red, green and yellow ; ligament horny, 

 arenaceous. (Rve.) 



Newcastle. A u.<tr<dii. 



Chiton dieffenbachii Rvi-;., Conch. Icon. t. 2'J, f. 14!'; species no. 

 148. 



The locality must be regarded with doubt until confirmed. It 

 mav prove to be from Peru, and a synonym or variety of ( '. Inr'nlt 

 Sowb. The figure is enlarged. 



C. APICULATA Say. PL 13, figs. 75-79. 

 Shell oval, elevated, light butf or aaheo, unicolored <>r having 



black patches at the sides or on the ridge (sometimes red or purple 



