C E M R I A. 



Genus CEMORIA, Leach. 



Testa palcllifoi-mis, ovafa, conica, costis radiata ; apex 

 inteijrus, postice recurvus ; foramen infra a2>icem 

 positus, inteme lamind arcuatd testacea semiclausus. 



Shell patelliform, ovate, conical, rayed with ribs ; apex 

 entire, posteriorly recurved ; foramen placed below 

 the apex and the margin, half-closed within by 

 an arched testaceous lamina. 



The species of this genus have a Nortlicrn ran^e. 

 In North America, the Northern parts of liritain, 

 Greenland, and Norway, are their habitats chielly to be 

 found. One species was discovered by Mr. Adams in 

 Japan. Although, like Rimula, the shells have tlie 

 foramen jjlaced half-way between the apex and the 

 margin, luihke tliat genus they have it internally half 

 vaulted by a shelly plate. 



Species 1. (iMus. Brit.) 



Cesiokia galeata. C(?»i. testd uvala, fumoso-fascA, 

 costis numeroms rotimdis, suhkevigatis et paticis 

 interstitialihus enuihus radiata latere podico 

 breviilsculo. 



Tile crested Cemoria. Shell ovate, smoky-brown, 

 rayed with numerous rounded rather smooth ribs, 

 and a few thin interstitial ones posterior side 

 rather short. 



GoDLD. United States Expedition. Shells. 



Hab. Puget's Sound. 



A Httle dull-coloured species without many charac- 

 teristic points. 



Species 2. (Mus. Brit.) 



Cemokia cognata. Cem. testd parvd, alba, costis ro- 

 tundis, prominentibus, conce7itrice rugatis, sub- 

 distantibus radiatd, interstitiis concentrice liratis ; 

 apice acuminata, elevato. 



The cognate Cemoria. Shell small, white, r.ayed with 

 rounded, prominent, concentrically wrinkled. 



rather distant ribs, with concentrically ride 

 terstices ; apex acuminated, elevated. 



Gould. Shells of the United States E.xpedition. 



Hah. Orange Harbour, Couthenay. 

 A sharp acuminated species. 



Species 3. (Fig. a, b, Mus. Brit.) 



Ce.mouia coxica. Cem. testd parvd, elevatd, conica, cvstis 

 parvis, rotundis, u/ternatis, concentrice striatis ra- 

 diatd ; dorso elevato, apice valde recurvo. 



The conical Gemohl\. Shell small, elevated, conical, 

 rayed with small, rounded, alternating, concen- 

 trically striated ribs ; back elevated, apex much 

 recurved. 



D'Orbignv. Amerique M('riilionale, p. 171, PL 78. 



Hab. Central America. 



Species 4. (Fig. a, b, Mus. Brit.) 



Cemoria fastigiata. Cem. testd alba, ovald, conicd, 

 altissinid, costis subanrjulatis, nodosis, alternatis, 

 tenuibus radiata ; apice elevato, post-mediani, 

 pauld recurvo; dorso antice subarcuato, postici; fere 

 perpendiculariter cleclivi. 



TuE HIGH-TOPPED Cemorla. Shell white, ovate, conical, 

 much elevated, rayed with rather angular, nodose, 

 alternative, thin ribs ; apex elevated, post-median, 

 a little recurved ; back a little arched anteriorly, 

 sloped nearly perpendicularly behind. 



A. Adams. Proc. Zool. Soc, 1851, p. 228. 



Ilab. ? 



The most elevated of all the species. 



Species 5. (Fig. <;, b, Mus. Brit.) 



Cemoria cucullata. Cent, testd elevatd, fulvd, magna, 

 atate juniori subspiraliter acuminata ; costis in- 

 (equalibiis, angulutis, concentrice tenuiter rugatis 



December, 1873. 



