658 



ciso-striata ; sulcis intermcdiis versus latera terminatis; margine 

 dorsali simplici, subarcuato, margine postico rectiusculo ; lunula 

 breviuscula ; epidermide cornea, fulva. 



Of a rather square form, very compressed, and with very finely 

 cut striae ; distinguishable at sight from the others of the group, 

 by its squareness and flatness. 



America. 



11. Artemis plana (pi. cxl. f. 10), Reeve, Conch. Icon. Ar- 

 temis, pi. iii. f. IS. 



Art. testa cotnpressa, subquadrata, alba, epidermide induta, 

 concentrice tenuissime striata, striis in medio obsoletis ; area 

 ligamenti simplici; lunula suboblonga; umbonibus acutis. 



Like A. discus, flat and square, but with the stria? so fine as 

 to be scarcely perceptible and nearly obsolete iu the middle. 



China. 



Sect. 2. Dorsal margins simple ; concentric ridges or sir ice 

 raised. 



12. Artemis exoleta (pi. cxli. f. 12, 43, 14), Linntzus 

 (Venus), Syst. Nat. 12th edit. p. 1134. Cytheraea exoleta, La- 

 marck. Pectunculus capillaceus, Da Costa, Brit. Conch, p. 187. 

 pi. xii. f. 5. Cytheraa sinuata, Turtou, Dith. Brit. pi. viii. f. 7 

 (figura solum). 



Art. testa suborbiculari, compress;!, setate ad latera subqua- 

 drata, pallide fulva, radiis et maculis angulatis rubescentibus 

 nonnunquam varie picta, concentrice elevato-striata, striis subru- 

 gosis subajqualibus ; margine dorsali simplici ; area ligamenti in- 

 distincta vel nulla; lunula convexiuscula, impressa; margine 

 antico prope lunulam elevato. 



The shape is rather round, but when full-grown tending at the 

 sides to square ; the stria? elevated, rather rough, but regular ; 

 the dorsal edge simple, and on the front side raised towards the 

 lunule. Some specimens are prettily variegated with brown mark- 

 ings on broad pinkish rays, and some are beautifully tinted with 

 rose-colour within. 



British and other European Seas. 



13. Artemis lincta (pi. cxli. f. 16), Pulteneij (Venus), Hut- 

 chins Dorset, p. 34. Venus sinuata, Turtou, Conch. Dith. p. 242. 

 Cythereea lincta, Lamarck. 



Art. testa pallide fulva, subnitente, ventricosa, subrotundata ; 



