433 



rvijata ; septo ungulato, margine laterali recto, ipice obtu- 



riore : operculo '. . . . 

 Test. jan. long. '055, hit. -006 — *012. 

 T.st. adult, long. -1, lat. .015— "023. 

 Hab. Teneriffe, i>0 fins, gravel < M' Andrew). Bins. Brit. &c. 



On examining the smooth Teneriffe Ceeea nndex a J-inch achro- 

 matic, thirty-six specimens were found, in Bhape agreeing with C. 

 Clarkii, but with the whole surface covered with irregular longitu- 

 dinal corrugations resembling thumb-marks, a sculpture entirely 

 wanting in the rest of the specimens. In the very young -In IN it is 

 scarcely discernible. 



31. ? Cecum corrugu latum, Cpr. 



1 C. (Fartuluw) t. "1 Brochinae glabriformi " timiU, ted tumidiore . 

 auperficie tranaveraim tenuissime striata, atriulia minimi* irre- 

 gulariter eorrugata ; septo Imamillato : operculo '. . . . 



Long. -075, lat. 017— "022. 



Hah. Mazatlan, 1 sp., off Chama. Mus. Brit. 



Maz. Cat. p. 327. 



The only specimen found is dead and imperfect, but presents a 

 sculpture like that of C. pollicare, yet in the opposite direction. Ii 

 may be a Brockina. 



32. Cecum dextroversum, Cpr. 



C. (Fart nhim) t. tereti, satis elongata, tenui ; septo tutnido, tub- 

 mamiUato ,• mucrone tutnidiaaimo, dextrorautn veraato; margine 



liitrrali rulJe confe.ro : operculo concaro, euturia ri.r definitia. 

 Test. jun. long. "023, lat. '008. 

 Test, adidt. long. 092, lat. -024. 

 Ilnlj. Mazatlan, rare. Mus. Brit. &c. 

 Maz. Cat. p. 328. 



About thirty specimens were found, off Spondylua, and (living) 

 among Olivellee, of which six had their opercula. The knob on the 

 plug is frequently worn off in the adult, leaving a mamillate appear- 

 ance. 



324. C I MM ( ' DICXTROVEUSUM, Var.) ANTII.I.A1U M. 



One young specimen only was found in the W. [ndian sponge, no< 

 presenting any characters by which it can be separated from C. des- 

 troveraum. Additional materials, however, may prove them distinct . 

 and it is kept provisionally separate, [t measures long. 056, lat. 

 ■01 012. 



AA. ' ( BCUM B1 BUI M>i; \HM, n. S. 



' C. (Fartulum) t. elongata, minima, latvi, hand niteniet aper- 



I urn hand emit nii-lii ; SCptO SM bmiiliiillii I <\ siilni ni/uliitn ■ „,ni- 



gine laterali extante, aupra satis eonvi to, tateribua ■ 

 No. CCCLXXIV. — Pro* ekdinqbofthi Zoological Sociktt. 



