280 MAIACOZOA. TROPIOPODA. LAMELLIBRANCHIATA. 



2. Tellina crdssa. Thick Tettina. 



Shell ovato-orbicular, compressed, rather thick, strong, 

 semitransparent, with numerous close concentric, convex, 

 ridgelets, and very minute radiating striulse ; yellowish-white, 

 with longitudinal pink rays, or plain ; the inside glossy, faintly 

 streaked toward the margin ; the siphonal impression very 

 large and oval ; one valve more convex than the other, each 

 with two teeth ; the umhones considerably behind the middle, 

 the frontal slope convex, the dorsal slightly convex, both ends 

 rounded. Length an inch and eight-twelfths, height an inch 

 and three-twelfths. 



A single valve found by Mr. Alexander Murray, at Fraser- 

 burgh, in October, 1842; an entire shell, by Mr. Fergusson, 

 at the Cove, in January 1843. 



Tellina crassa. Penn. Brit. Zool. iv. 87. PI. 48. f. 58. Tellina 

 fausta. Mont. Test. Brit. 64. Tellina crassa. Mont. Test. Brit. 

 65. Tellina crassa. Lamk. Syst. v. 529. Tellina crassa. Turt. 

 Brit. Biv. 109. PI. 7. f. 2. Tellina crassa. Flem. Brit. Anim. 436. 



3. Tellina ttnuis. Thin-shelled Tellina. 



Shell ovate, compressed, very thin, white tinged with pink ; 

 both valves a little bent behind, glossy, with concentric strise, 

 the right a little more convex anteriorly ; the umbones behind 

 the middle, the frontal slope convex, the dorsal descending, 

 somewhat angular ; two small cardinal teeth in each valve. 

 Length an inch and two-twelfths, height nine-twelfths. 



The colour varies considerably, some being yellowish-white, 

 others tinged with pink, and having the interior yellow. 



Common along the sandy shores ; often cast on the beach ; 

 frequently brought up by the fishing-lines. 



Tellina planata. Penn. Brit. Zool. iv. 87. PL 48. f. 29. Tellina 

 tennis. Mont. Test. Brit. 59. Tellina tenuis. Turt. Brit. Biv. 107. 

 Tellina tenuis. Flem. Brit. Anim. 436. Tellina tenuis. Larnk. 

 Syst, T. 526; Ed. 2. vi. 197. 



4. Tellina Fdbula. Streaked-shelled Tellina. 



Shell subovato-oblong, narrowed behind, compressed, very 

 thin, yellowish-white ; both valves a little bent behind toward 

 the right, the left being convex, the right concave at that part ; 

 the right valve obliquely striate, and more convex anteriorly, 

 the left smooth and glossy ; a single cardinal tooth in one valve, 

 two in the other. Length eleven-twelfths of an inch, breadth 

 seven-twelfths. 



