MALACOZOA. TROPIOPODA. LAMELLIBRANCHIATA. 273 



thin with twenty-six little elevated, convex, glossy ribs, which 

 toward the margins are marked with transverse lamellae, be- 

 coming elevated on the anterior end, and still more so on the 

 posterior, where they sometimes resemble flattened spines ; 

 the colour white, with irregular bands or spots of red, more es- 

 pecially at the posterior end ; the inside white, the margins 

 plicato-crenate. Length four-twelfths and a-half, height four- 

 twelfths. 



Not very uncommon off the sandy coast ; sometimes brought 

 up by the lines : Aberdeen, Peterhead, and Gamrie. 



Cardium fasciatum. Mont. Test. Brit. Suppl. 30. PL 27. f. 6. 

 Cardium fasciatum. Turt. Brit. Biv. 189. Cardium fasciatum. 

 Flem. Brit. Anim. 422 Cardium fasciatum. Peun. Brit- Zool. ; 

 Ed. 2. iv. 191. 



4. Cardium exiguum. Diminutive Cockle. 



Shell subcordate, suborbicular, somewhat oblique, convex ; 

 with the dorsal margin longer than the anterior, which is 

 rounded, the posterior end obliquely subtruncate ; the valves 

 thin, with twenty-four little elevated, convex, smoothish ribs, 

 which, toward the anterior end, are marked with transverse 

 lamellae, and at the posterior with prominent tubercles ; the 

 grooves between the ribs very narrow, toward either end of the 

 shell, but especially at the anterior, transversely striate or 

 marked with minute compressed papillae ; the colour white, 

 sometimes with reddish markings ; the inside white, often red- 

 dish or brownish near the posterior end ; the margins plicato- 

 crenate. Length about four-twelfths of an inch, height some- 

 what less. 



Not very uncommon off the sandy coast ; found at Aberdeen 

 first by Mr. Davidson, and afterwards by Miss Anne Macgil- 

 livray. 



Cardium exiguum. Gmel. Syst. Nat. 3255. Cardium exiguum. 

 Mont. Test. Brit. 82. Cardium exiguum. Turt. Brit. Biv. 187. 

 Cardium exiguum. Flem. Brit. Anim. 422. 



5. Cardium lavigdtum. Smooth Cockle. 



Shell roundish-oval, much produced behind, moderately 

 convex, covered with a yellowish-brown or greenish-grey epi- 

 dermis ; the valves rather thin, marked with very numerous 

 obsolete ribs, the interstices between which are faintly striated 

 longitudinally; the colour beneath the epidermis reddish- 

 white ; the inside glossy white ; the margin crenato-sulcate. 

 Length two inches, height two inches and a-half. 



