34 < ii. i I'.IM.I TRA. 



To this species Cnr|>enter unites C. teabrimhus Sowl). pi. \'l. 



I aii.l !./, nix'/ufon }><irallelusCpr., afigureof which, drawn from 

 a Carpenteri; men from Cape St. Lucas, is given on pi. 12, 



fig. 50. It is likely that C. columbiensis should be added to the 

 synonymy, as it presents no differential characters of much value. 



Var. PARALLEL* Cpr, PI. TJ, fig. 50. 



The specimen In-fore me of the form jtarallelus, measures 17 by 

 11 mill. It is rather acutely carinated, the sides slopes nearly 

 straight. There are 17 beaded longitudinal threads on each side 

 of the central areas, and from 6 to 7 rows of separated, rounded ? 

 erect tubercles on each lateral area. The lateral areas are decid- 

 dly elevated; the mucro is slightly prominent. The girdle has 

 sparsely scattered hyaline short hairs. The gills continue as far as 

 the front end of the foot. The outside is reddish, marbled with 

 darker and white, the girdle dark ashen. The interior is bluish- 

 white. 



Cape St. Lucas. 



The >tyle of sculpture is the same as in C. gemmea, but the shell 

 is much broader than in that species. 



Var. r i :. \SINATA Cpr. 



lihir to jHir'i/lefn, but vivid green; lateral areas irregularly 

 ornamented with series of tubercles. Cape St. Lucas. 



Var. "i.i MI;II NMS Sowerby. PI. 12, figs. 51, 52. 



Shell ovate, a little depressed, ashen ; end valves and lateral 

 MPBAS --parsely gnumlote; Central areas longitudinally <rrunose-lin- 

 eate. (S6y.) Length 31, breadth 18 J mill. 



Bay of Panama, under stones at low water. 



C.co/'wiAi>//*MSowi:.. P. /.S.I 832, p. 58; Conch. Illustr. f. 15. 

 L'I.I.VI . Conch, leuii. f. 82. Clwtopleura columbiensis Sby. CPR., 

 m. 



Carpenter says: Mucro slightly in front of the middle, sul>- 

 planate, the posterior part exeiirved. Interior: posterior valve 

 with *. anterior valve !), central 1 >lit. Teeth obtuse, scarcely 

 roughened; eaves large; sinus narrow, moderately deep. Girdle 

 leathery, with a f.-w corneous hairlets. . . . One of Colonel 

 Jewett's specimens is of a uniform dark chocolate color, but parts 

 of some ,,f the valve- are of a variegated olive. 



Of another specimen ( 'pr. writes: One specimen of the wiliri- 

 culus type. Girdle finely hairy. K'.d. with dark girdle. On each 



