3 1 CYPE2EA. 



lateribus rnagis expanso-depressis, lateribus minute punc- 

 tatis. 



115. cribellum, Gash., (f. 165, 166). — C. testa C. cribrarice 

 affini, magis cylindracea; dorso depresso, latere dextro rec- 

 tiusculo ; basi planulata, ad medium rosea, pallide fasciata ; 

 dentibus coluin elite parvis, sulco columellari nullo, plica ter- 

 miuali prominente ; apertura latiore ; labio planulato ; den- 

 tibus paucioribus. 



] 16. Gaskoinii, Reeve, (f. 352, 353). — C. testa G. cribrarice 

 affini, magis ovata; basi vix incrassata, punctis lateralibus 

 minutis, foraminibus minoribus annulatim pallide circuni- 

 scriptis; dentibus minoribus. 



Note. — Cribraria, Peasei, esontropia, cribellum, Gaskoimii. 

 These may be only varieties of one essential species, but they 

 are distinguishable. There is a character of thickness in the 

 white enamel of the base, and a swelling in the teeth in 

 cribraria, the typical form of the group, which partly distin- 

 guishes it from the others. It is more cylindrical than any 

 of them, excepting cribellum, which has much fewer teeth, a 

 still more cylindrical form, a more flattened base, and no 

 columellar ledge or groove beyond the surface ; the mouth, 

 in consequence, appears wider. Mr. Reeve has figured a 

 side-spotted variety of cribraria for esontropia, but the true 

 esontropia is a broader, heavier, more pyriform shell, with 

 ends more pointed and approximate. The Sandwich Island 

 shell, now named Peasei in collections, has been catalogued 

 in sales, etc., as Gaskoinii ; but the true Gaslminii is a much 

 more delicately and finely marked and sculptured shell. 

 The aperture is narrower, teeth finer, ends much more 

 pointed and close, lateral and basal dots more minute, sieve- 

 like holes in the dorsal colouring smaller and closer, with 

 faintly ringed margins. Peasei is very much lighter and 

 thinner than the true cribraria, with narrower teeth, more 

 pointed ends, and generally more rounded form. The white 

 disks in all these and the two following species, are not 

 depositions, but perforations in the layer of golden-chestnut 

 colour. 



117. Cumingii, Gray, (f. 349, 350, 351).— C. testa oblongo- 

 pyriformi, alba, antice attenuate ; dorso colore fulvescente- 

 castaneo foraminibus rotundis annulatis albis parviusculis 

 perforato picto ; extremitatibus angustis, acuiuinatis, ad 

 latera crenulatim-fovcolatis, nigro-lineatis ; latere dextro 



