1215 ARCA. ARK-SHELL. Class VI. 



3. MINUTA. G}n. Lin. 3309- Moni. Test. Br. 140, 



Liii. Tf. viii. 92. 



* A. with an oblong-oval shell, one end round- 

 ed, the other somewhat abruptly angular: 

 length three-eighths of an inch, breadth half 

 an inch. 



Not uncommon at Saudzvich, 



** Edge crenated or notched ; beaks 

 recurvated. 



4. LACTEA. Lin. Syst. 1140. No. I73. Mont. Test. Br. \3&. 



Gm. Lin. 330g. A. barbata. Br. Zool. iv. gS. 



Lhi. Tr. viii. 92. 



A. with oblong shells faintly striated ; beset 

 with Bi/ssus so as to appear bearded. In En- 

 gland of the size of a horse-bean, the foreign 

 specimens much larger. Tab. Ixi. Jig. 2. 



*^* Edge crenated ; beaks inflected. 



6, GLYCY- Gm. Lin. 3313. Lin. Tr. viii. 93. t. 3.f. 3. 



MERIS. 



* A. with a somewhat circular shell, gibbous, 

 rather striated ; beaks incurvated ; margin ere- 



