(559 



marginibus dorsalibus subdeclivibus, simplicibus ; area ligamenti 

 nulla; lineis elevatis concentricis ad latera paululum elevatis, 

 sublaminatis, 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), Reeve, Conch. Icon. 

 Artemis, pi. ix. f. 52. 



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

 tumidiuscula, postice expansa, albida, pallide rubescente, striis 

 inipressis radiantibus costellas concentricas decussantibus; costellis 

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

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

 ampla, lamellatim rugosa. 



Rather more square and ventricose than 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, subllexuosa ; 

 margine dorsali elevato, simplici, concentrice rugoso-costellato ; 

 costellis elevatis numerosis, subrequalibus ; pallide rufescente, 

 fusco-radiata, prope umbones noununquam purpurascente ; lu- 

 nula subrotuudata, profuude 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 A. exoleta 

 in being more distinct and raised. 



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

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

 Cuming. 



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

 Artemis, sp. 42. Cytheraea trigona (by error), Thes. Conch, 

 part 12. 



