14 



lato : fissura ovali-rotundata. Long. l-$y, lat. l T \j, alt. 1$ poll. 

 Hab. Callao. 



In shape and color it agrees with F. cctffra, Chem., from the 

 Cape of Good Hope, and also with F. Praya, Quoy. It is re- 

 markable for its elevated, conical form, and dark, radiate ex- 

 terior. 



Rimula cucullata. Testa solida, cinerea, per-inequilateralis, 

 costis ad 40 acutis, compressis, majoribus et minoribus alternanti- 

 bus radiata, et striis concentricis confertis muricata ; apice ele- 

 vato, acuto, adunco, prorsum spectante : fissura lanceolata : aper- 

 tura ovata ; margine sulcis inequalibus alternantibus crenulato : 

 facies interna porcellana; fornice tenui, simplici, arcuato. Long. 

 |, lat. T 7 F , alt. § poll. Hab. Puget Sound. 



A large and curious species, its very inequilateral form giving 

 it the aspect of a Hipponix. It is less elevated in proportion to 

 its base than any other known species. The ribs are very regu- 

 lar, and sometimes still finer rays are found in the interstices. 



Rimula galeata. Testa solida, cinerea, elevata, globoso-coni- 

 ca, apice central!, acuto, prorsum porrecto, striis filiformibus con- 

 fertis radiata, et striis minoribus concentricis decussata : fissura 

 brevis, fusiformis : apertura rotundato-ovalis ; margine expanso, 

 acuto, minutissime crenulato ; fornice costa transversali antice 

 suffulto, fossam trigonalem utroque latere formante. Long. ^-, 

 lat. ^j, alt. 2- R q poll. Hab. Puget Sound. 



Differs from the preceding in shape, sculpture, and in the in- 

 terior rib, which props the fornix, and forms, two pits, which, 

 with the fissure, remind one of the openings for the eyes and 

 nose in the human skull. 



Two small species of Rimula were found at Orange Harbor, 

 one of which is probably R. conica, D'Orb., and the other I name 

 R. cognata, which is similar to the preceding and to R. Noachma, 

 but more depressed. These were found living, and will be again 

 noticed when describing the animal. 



Crepidula rostriformis. Testa solida, Isevis, castanea, ele- 

 vata, recurva, ad basim rotundato-ovalis ; apice postico, adunco : 

 lamina interna parva, alba, profunde sita, versus apicem pene- 

 trans ; margine arcuatim sinuato. Long, f, lat. ^-, alt. § poll. 

 Hab. Straits of De Fuca. 



