MONOGRAPH OF THE GENUS 



ARTEMIS. 



Fatn. Veneridse. 



Char. Gen. Testa gequivalvis, insequilateralis^ plus miimsve or- 

 bicularis, plerumque compressa, concentrice striata aut costellata, 

 antice prope umbones plerumque lunulata. Cardo fortis, subsepti- 

 formis, dentibus tribus aut quatuor divergentibus ; ligamento elon- 

 gate, partim iuterno. Impressiones musculares pyriformes; im- 

 pressio pallii sinu profundo acute trigono. 



The shells of this genus are easily distinguishable from C//- 

 thercea, not only by their general form, which is lenticular, but 

 by the deep angular sinus in the impression of the mantle, in- 

 dicating a peculiarity in the animal. Nearly all the shells are 

 of a white or light colour, and have concentric ridges or strife. 

 Three species are found in Europe ; a few in America, Australia, 

 and North Africa ; and the greater number in Japan, China, the 

 Philippines, and other localities in the Eastern Seas. 



Sect. 1. Dorsal margin simple ; concentric ridges flat. 



1. Artemis concentrica (])1. cxl. f. 1), Gmelin (Venus), 

 Syst. Nat. p. 3286. 



Art. testa subrotundata, latiore quam alta, alba, epidermide 

 pallide straminea, concentrice sulcata, sulcis continuis; margine 

 dorsali elevato, simplici ; lunula profunde excavata. 



Rounded, but wider than high; wliite, with a pale straw- 

 coloured epidermis ; concentrically and continuously grooved, the 

 interspaces being narrow and flat; no ligamental area; lunula 

 deeply impressed. 



Porto Portrero, Central America. Guming. 



2. Artemis distans (pi. cxl. f. 3), ? 



Art. testa crassa, ventricosa, postice expansa, alba, epidermide 



4 Q 



