CEiMORIA.— Plate I. 



radiata, intcrstitiis ronrentncc striatis ; apicc antc- 

 mediani ; /ined dnrsali antice declivi, rectius- 

 culo. 



The hooded Cem()i:ia. Shell elevated, fulvous, large, 

 in a young stage almost spirally acuminated; 

 rayed with unequal, angular concentrically finely 

 wrinkled ribs, with concentrically striated inter- 

 stices, apex ante-median, dorsal line sloped, rather 

 straight. 



Gould. United States Expedition. Shells, p. 14. 



Hah. — ? 



This shell gives all the characteristics of the genus 

 on a larger scale than the original type. 



Species G. (Fig. a, l>, Mus. Brit.) 



Cemouia nobilis. Cem. testa breviusaihl, ovatd, conicd; 

 elevatissimd ; estate junim-i fere spirnliter acuminatd : 

 costis octodecim circa distantibus, lavigatis, majori- 

 hus, et intermediis nonriullis tenuissimis radiatd ; 

 apice acuminato, perelevato ; dorm utrinque vald'c 

 declivi. 



The noble Ce.morl\. Shell rather short, ovate, conical, 

 much elevated ; in a young stage almost spirally 

 acuminated ; rayed with about eighteen distant, 

 smooth, larger, and some very thin intermediate 

 ribs ; apex acuminated, much elevated, with the 

 back on both sides much sloped. 



A. Adams. Proc. Zool. Soc. 

 Hah. Okosiris, Japan. 



Species 7. (Fig- a, h, Mus. MacAndrew.) 



Cemoria Noachina. Cem. testa alba, conicd, elevatd, 

 postice subexpaitsd, antice magis angustatd ; costis 

 ina;qiialibus, Ueviusoulis postice distantibus, antice 

 magis numcrosis radiatd : apice elevatn, post- 

 mediani. 



The NoACHiAN CEiMoiuA. Shell white, conical, elevated, 

 posteriorly rather expanded, narrower anteriorly ; 

 rayed with unequal, rather smooth, posteriorly 

 distant, anteriorly more numerous ribs; apex ele- 

 vated, post-median. 



LiNNiEus, Mantissa, 551. 



Patella fissurella, Miiller. 



Patella apertura, Montagu. 



Rimida Flemingii, MacgiUivray. 



Cemoria princeps, Mighsls. 



Ilnb. Northern Europe. 



Species 8. (Mus. Brit.) 

 Cemowa Palklandica. Cem. testd ovatd, alba, elevatd, 



costis subdistantibus, concentrice strialis radiatd : 



apice recurvo, elevato, jMst-mediani. 

 The Falkland Cemoria. Shell ovate, white, elevated, 



rayed with rather distant, concentrically striated 



rilis ; apex recurved, elevated, post-median. 

 A. Adams. Sowerby's Thesaurus. Fissurellida;, Cemoria, 



Sp. 7, Plate X. fig. 14. 

 Hab. Falkland Islands. 



The ribs are more distant and equal than those of 

 Cemoria Noachina, and the oval outline is as broad 

 anteriorly as posteriorly. 



