MA1ACOZOA. TROPIOPODA. LAMELLIBRANCHIATA. 259 



with a lanceolate, obliquely striated impression of which the 

 sides slope inwards ; the valves moderately thick, with twenty 

 or more concentric, convex ridges, narrower than their inter- 

 stices, which, as well as they, are concentrically striated ; the 

 epidermis yellowish-brown ; two strong teeth in the left valve, 

 a medial stronger tooth, and two slight teeth in the right; 

 inne surface white; margin plain. Length an inch, height 

 ten-twelfths. 



Almost precisely similar to Astarte Danmonia, in every re- 

 spect, unless in having the valves thinner, and the margins 

 without crenatures. 



Not uncommon off Aberdeen, and sometimes brought up by 

 the lines. Found also at Gamrie, Banffshire, by Miss Macgil- 

 livray. 



Venus Scotica. Mont. Test. Brit. Suppl. 44. Crassina Scotica. 

 Turt. Brit. Biv. 130. Astarte Scotica. Flem. Brit. Anim. 440. 

 Crassina Scotica. Brown, Illustr. PL 18. f. 9? Crassina com- 

 pressa. Brown, Illustr. PL 18. f. 4, 5. 



3. Astarte sulcdta. Roundish Grooved Astarte. 



Shell rotundato-trigonal subangulated posteriorly, convex; 

 with the anterior end longer, the umbones pointed and con- 

 tiguous ; the dorsal slope convex, with a lanceolate, obliquely 

 striated impression, of which the sides slope inwards ; the an- 

 terior slope somewhat concave, with an ovato-lanceolate 

 obliquely striated impression with concave sloping sides ; the 

 valves very thick, with twenty-five or more concentric convex 

 ridges, of the same breadth as the interstices, which, as well as 

 they, are concentrically striated ; the epidermis olive-brown ; 

 two strong teeth in the* left valve, a median stronger tooth and 

 two small teeth in the right ; inner surface white, dull, glossy 

 toward the margin, which is crenate. Length an inch, height 

 ten-twelfths. 



Very similar to Astarte Danmoniensis, but with more nu- 

 merous rugae, which are of about the same breadth as their 

 interstices, whereas in it they are considerably narrower. 



Not uncommon in deep water, and on hard ground, off 

 Aberdeen. 



Venus sulcata. Mont. Test. Brit 131. Crassina incrassata. 

 Desh. Lamk. Syst. ; Ed. n. vi. 257. Venus sulcata. Lamk. Syst. 

 v. 592; Ed. n. vi. 349. 



4. Astarte elliptica. Elliptical Astarte. 

 Shell ovato-elliptical, compressed ; with the anterior end 



