216 ARCA. ARK-SHELL. Class VI. 



3. minuta. Gm. Lin. 3309- Mont. Test. Br. 140. 



Lin. Tr. viii. Q2. 



* 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 Sandwich, 



** Edge crenated or notched 5 beaks 

 recurvated. 



4. LACTEA. Lin. Syst. 1140. No. 173. Mont. Test. Br. 138. 



Gm. Lin. 330Q. A. barbata. Br. Zool. iv. 98. 



Lin. Tr. viii. 92. 



A. with oblong shells faintly striated; beset 

 with Byssus 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. 



5. GLYCY- Gm. Lin. 3313. Lin. Tr. viii. 93. /. 3.f. 3. 



MERIS. 



* A. with a somewhat circular shell, gibbous, 

 rather striated ; beaks incurvated ; margin ere- 



