670 



Similar in form to A. Japonica, etc., but very remarkable for 

 the coarsely wrinkled character of the elevated riblets at the pos- 

 terior side, compared to the almost obsolete and fine strife in the 

 middle. 



Locality unknown. In Mr. Cuming's collection. 



55. Artemis exaspeeata (pi. cxliii. f. 62), PJdlijipi, Ab- 

 bild. Cyt/i. pi. viii. f. 4. 



Art, testa subquadrata, alba, comprcssa, concentrice creberrime 

 costellata, costellis in medio lsevigatis, prope marginem et ad 

 latera subcorrugatis, ad latera lamellatis et intcrruptim elevatis, 

 ad marginem dorsalem in nodulos productis ; area ligamenti sub- 

 excavata, striata; lunula profunde impress;!. 



White, a little squared at the sides ; very finely ribbed, except 

 at the sides, where the ribs are few, coarse, and wrinkled, a few 

 of them being raised into nodules circumscribing the ligamental 

 area. 



Bay of Manilla, island of Luzon, Philippines; in sandy mud. 

 Cuming. 



56. Artemis bilunata (pi. cxliii. f. 66), Gray, Analyst, 

 1838, part 24, p. 309. 



Art. testa, albida, orbiculari-subtrigona, versus umbones elevata, 

 pallide radiis roseis interruptis picta, concentrice tenuissime striata, 

 lineis ad latera in squamas angulatas productis, postice ad mar- 

 ginem, antice post aream late distinctam et lajvigatam terminatis ; 

 lunula ovali, linea profunda circumscripta ; area, ligamenti an- 

 gustata,, vix depressa; umbonibus parvis, elevatis. 



The striae are very fine in the middle of the shell, but at the 

 sides some of them are produced into angular laminai ; at the 

 front side these laminated points terminate in a radiating series 

 before reaching the margin, so as to leave a broad, distinct, smooth 

 area, which is separated from the true lunule by a deep groove. 

 The shell is beautifully painted by radiating interrupted rays of 

 pale pink. 



Japan. Dr. Siebold. 



57. Artemis Ctjmingii (pi. cxliii. f. 64), Reeve, Conch. Icon. 

 Art. pi. v. f. 3. 



Art. testa subalbida, fusco radiata et tincta, subcompressa, ad 

 latera subangulata, tenuissime striata, ad marginem dorsalem et 



