659 



marginibus dorsalibus subdeclivibus, simplicibus ; area ligamenti 

 nulla; liiieis elevatis concentricis ad latera paululura elcvatis, 

 sublaininatis, creberrimis ; lunula impressa. 



The dorsal edges are more sloping, the shell more ventricose, 

 the concentric ridges more nearly laminated at the sides, and 

 more smooth near the umboes, than in A. exoleta. 



Great Britain, and Seas of Southern Europe. 



14. Artemis sculpta (pi. cxli. f. 15), Eeeve, Conch. Icon. 

 Artemis, pi. ix. f. 52. 



Art. testa orbiculari-subquadrata, paululiim latiore quam alta, 

 tumidiuscula, postice expansa, albida, pallide rubescente, striis 

 impressis radiantibus costellas concentricas decussantibus; costellis 

 concentricis acutiusculis, crebris, ad latera (antice prsecipue) lami- 

 natis, undatis ; margine dorsali elevato, simplici ; lunula oblonga, 

 ampla, lamellatim rugosa. 



Rather more square and ventricose tlian A. exoleta, and differ- 

 ing from any of its varieties in being decussated at the sides by 

 impressed radiating striae crossing the concentric riblets, which 

 are in that part laminated and undulated. 



Locality unknown. In Mr. Metcalfe^s cabinet. 



15. Artemis amphidesmoides (pi. cxli. f. 17, 18, 19), Reeve, 

 Conch. Icon. Artemis, pi. viii. f. 48. A. radiata. Reeve, ib. pi. vii. 

 f. 37 inclusa. 



Art. testa subquadratim orbiculari, postice magna, subflexuosa ; 

 margine dorsali elevato, simpKci, concentrice rugoso-costellato ; 

 costellis elevatis numerosis, subsequalibus ; pallide rufescente, 

 fusco-radiata, prope umbones nonnunquam purpurascente ; lu- 

 nula subrotundata, profunde impressa, 



I cannot separate the variety named A. radiata from this, on 

 account of the accidental contortion of some specimens ; both 

 are remarkable for the expansion of the hinder part of the shell, 

 and the character of the ribs, which differ from those of ^i. exoleta 

 in being more distinct and raised. 



Mouth of the river Gambia, Western Africa ; also island of 

 Burias, Pliilippines ; in coarse sand, at a depth of six fathoms. 

 Cuming. 



16. Artemis trigona (pi. cxh. f. 29), Reeve, Conch. Icon. 

 Artemis, sp. 42. Cythergea trigona (by error), Thes. Couch, 

 part 12. 



