G. t. parvâ, tenui, albidâ; vertice nucleoso planato, extante, minimo, anfr. uno et dimidio planorbi-formibus, apice conspicuo; dein conoideâ, elevata, solute spirali, suturis impressis; superficie rudi, laminis incrementi interdum conspicuis; laminâ internâ.
Long. 0·26, lat. 0·24, alt. 0·15, div. 80°.
Hab. Monterey, 20-40 fm.; Santa Barbara, 16-20 fm.; Catalina Island, 30-40 fm.; Cooper.
The vertex stands out like a tiny Planorbis, and is more minute than in any species I have examined.
Genus Cæcum, Fleming.
Cæcum crebricinctum, Cpr. n. s. State Collection, No. 388.
C. (Anellum) t., quoad genus, magnâ, tereti, solidiore, rufofusca, interdum radiis intensioribus longitudinalibus ornatâ; annulis gracillimis, creberrimis, rotundatis, haud elevatis circ. lxxx. cinctâ; interstitiis nullis; sculpturâ longitudinali nullâ; aperturâ acutâ, vix contractâ, vix declivi; septo subungulato, submucronato; margine laterali recto; apice acuto, ad angulum circ. 45°, maxime elevato; operculo vix concavo, lirâ spirali elevatâ.
Long. 0·14, lat. 0·04.
Hab. San Diego, 8-10 fms., 12; Monterey, 20 fms., 20, some alive; Santa Barbara, 20 fms., 3, Cooper.
Has the aspect, but not the sculpture, of an Elephantulum.