658 



ciso-striata ; sulcis intermediis versus latera terminatis ; margiiie 

 dorsali simplici^ subarcuato, margine postico recti u sculo ; lunula 

 breviuscula ; epiderinide 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. AuTEMis PLANA (pi. cxl. f. 10), Reeve, Conch. Icon. Ar- 

 temis, pi. iii. f. 18. 



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

 concentrice tenuissime striata, striis in medio obsoletis; area 

 ligameuti simplici; lunula suboblonga; umboiiibus acutis. 



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

 to be scarcely perceptible and nearly obsolete in the middle. 



China. 



Sect. 2. Dorsal margins simple; concentric ridges or strice 

 raised. 



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

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

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

 pi. xii. f. 5. Cythersea sinuata, Tiirton, Dith. Brit. pi. viii. f. 7 

 (figura solum). 



Art. testa suborbiculari, compressa, setate ad latera subqua- 

 drata, pallide fulva, radiis et maculis angulatis rubescentibus 

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

 gosis suba3qualibus ; margine dorsali simplici ; area ligameuti 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 striae 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), PiiUenet/ (Venus), Hut- 

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

 Cythersea lincta, Lamarck. 



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



