rotundatis flexuosis instructa, vertice sub-centrali, colore satu- 

 rate cinnamomea ; facies interna talcoso-argentata, purpureo 

 tincta ; callo centrali crasso, albo, spatuliformi, ad marginem 

 radiato ; impressione musculari lato, profundo : margo crenulatus. 

 Long. 4, lat. 3J-, alt. 1J poll. Hab. Hawaii, Sandwich Islands. 



The colors of the interior, in small specimens, are very rich, 

 and the shell is of a rounded shield-like form, like P. testudinaria, 

 attaining sometimes a very large size, larger than any other spe- 

 cies except P. pyramidala. 



Patella sagittata. Testa tennis, translucida, ovato-rotundata, 

 depressa, fusco-viridis, nigro obscure radiata, subtilissime granu- 

 loso-striata, apice antico, acuto, incumbente ; margine integro : 

 facies interna argentea, cum reflexionibus succineis, et interdum 

 fusco radiata ; fundo (luce transmisso) elegantissime reticulato, 

 et maculis sagittatis radiato. Long. 1^,-lat. 1-j^, alt. f. Hab. 

 Feejee Islands. 



This delicate and beautiful species is allied to P. testudinaria, 

 but is more depressed and more delicate in all its characters, and 

 its peculiar marking, as seen by transmitted light, like some of 

 the Navicellse, distinguishes it. It was the only species collected 

 at the Feejee Islands. 



Patella illuminata. Testa inequilateralis, ovato-conica, fuli- 

 ginosa, maculis sparsis flavidis translucidis illuminata, creberrime 

 radiatim costellata : apertura ovata ; facies interna nigro-picea, 

 sericeo splendens ; fundo flavido. Long. 1 J-, lat. 1^, alt. f poll. 

 Hab. Auckland Islands. 



In shape like P. argentea, with the interior of P. tramoserica. 

 It may be the young of what is figured by Quoy as P. granu- 

 lans. 



Patella fimbriata. Testa elevata, oblique conica, fusco-pur- 

 purea, cinereo tincta, costulis distantibus rotundatis radiata, costu- 

 lis tuberculos fornicatos in seriebus concentricis instructos geren- 

 tibus ; apice acuto subcentrali : apertura ovata, limbo lato, nigro 

 pectinato : facies interna nitida, cseruleo-alba, secundum costulos 

 radiata, fundo saturation. Long. 1}, lat. |$, alt. ^. Hab. 

 Straits of De Fuca. 



Much like a small P. granularis in shape. The undulations 

 within, corresponding to the ribs, are marked with unusual dis- 



