368 



onibus posterioribus transversis, anterioribus in unam transversalem 

 confluentibus, rostello parvo, disco pedato, limbo antico incrassato ; 

 valva superiore subtrapezoidali, cicatricibus posterioribus magnis 

 limbo interno incrassato, elevato, margine tenuij extus lsevi, 

 brunnea. 



Tound upon corals in the Mediterranean. The upper valve, 

 which is very rarely seen in England, is rather smaller than the 

 attached valve, its posterior muscular impressions are large and 

 prominent, and its outer edge is very thin. This species is but 

 slightly distinguishable from C. per sonata. 



3. Crania Norvegica (pi. lxxiii. f. 15, 16, 17.) nobis. 

 Patella anomala, Mull. Zool. Dan. Patella, distorta, Montagu 

 Test. Brit. 



Testae valva inferiore transversim rotundato-subtetragona, postice 

 retusaj cicatricibus posticis magnis ovatis, antice subangularibus, 

 anticis discretis, ovatis, in centrum fere coalescentibus; rostello 

 obtuso ; disco palmato-radiato ; liinbo antico incrassato, granulato ; 

 valva, superiore tenuiore, rugidosa, subtrapezoidali, brunnea, cica- 

 tricibus posterioribus magnis, Umbo interno incrassato, margine 

 tenui. 



There is little to distinguish this from C. personata and C. ringens, 

 except the separation of the anterior muscular impressions in the 

 attached valve, by the interposition of what Hoeninghaus calls a 

 rostellum "like a nose between the mouth and the eyes" ; in the 

 present species, however, the upper valve is exactly of the same 

 dimensions as the lower. 



Coasts of Ireland and Scotland, abundant in some localities. 



4. Crania rostrata (pi. lxxiii. f. 12, 13, 14.) Keening. I.e. 

 p. 3./. 3. a, b. 



Testse valva, inferiore rotundato-subtrapezoidali, margine postico 

 rectiusculo, cicatricibus posticis orbicularibus ; anticis parvis, semi- 

 lunaribus, antice coalescentibus, rostello parvo, acutiusculo ; disco 

 sinuato, limbo granifero, antice irregulari, incrassato ; valva supe- 

 riore tenuiore, alba, subradiatim rugosa, intus costellis duabus 

 elevatis, radiantibus, ex centro versus marginem posticum decur- 

 rentibus. 



Inferior or attached valve of a rounded, somewhat trapezoidal 

 form, its posterior margin nearly straight, posterior muscular 

 impression orbicular; anterior small, somewhat lunulate, united 

 anteriorly ; rostellum small, [rather sharp ; disk with palmated 

 and digitated impressions ; border granulose, irregular and thick- 



