34 



is broad, with its edge whitish ; its basal termination is broadly 

 rounded. 



The Pacific types are rarely more than one inch in length, elon- 

 gated, more than half a cylinder ; tubercles decidedly spinous ; 

 aperture rather contracted, thinly coated with enamel within and 

 destitute of the chestnut blotch ; left lip comparatively narrow, its 

 edge barely a little paler, its basal termination acute and curving 

 quite abruptly towards the canal. 



These distinctions being constant, so far as I have seen speci- 

 mens, would seem to be sufficient, together with their remote locali- 

 ties, to authorize a separation under the above name. 



Among the rarer species contained in these California collections 

 were Venus aurantiaca, Sowb., from Santa Barbara, supposed by 

 Mr. Sowerby to belong to the Philippine Islands ; Venus gnidia, Ma- 

 zatlan ; Artemis gigantea y La Paz ; Tellina regia, Mazatlan ; 

 Tellina Burnett, Brod. L. California ; Paraplwlas Californica, 

 Conr. (P. Janellii, Desh.) S. Diego ; Periploma planiuscula, Guay- 

 mas ; Thracia granulosa, La Paz ; Anomia macrochisma, Mon- 

 terey ; Trochus Norrisii, Santa Barbara ; Oniscia tuberculosa, S. 

 Juan ; Cassis coarctata, S. Juan ; Saxidomus Nuttalli, Conr. (Ve- 

 nerupis Petitii, Desh.) S. Diego ; Cancellaria olesa, La Paz ; Can- 

 cellaria cassidiformis, La Paz ; Cyrtulus distortus, Panama ; 

 Ostrea Cumingiana, La Paz ; Pectunculus giganteus, Guaymas ; 

 Chiton Magdalenensis, Mazatlan ; Chiton muscosus, Gould (C. 

 Collei, Reeve) Panama ; Chiton Stokesii, Brod. S. Francisco; Mar- 

 ginella imbricata, Hinds. Santa Barbara ; Cerithum irroratum, 

 Gould, Mazatlan ; Saxicava Cordieri, Desh. Mazatlan ; Tellina 

 Bodegensis, San Francisco ; Cardium elatum, Brod. San Diego ; 

 Sanguinolaria decora, Hinds, San Diego. 



