158 Mr. WiLLfAM Wood's Obfervatiom on the 



margaritlfera, Linn. Sjift. Nat. ed. Gmel. i. /-. 3219. Penn. Br. Zool. 



No. 18. /. 43. / 18. Da Cojl. Conch, t. 15. f. 15. 



Ljji. Conch, t. 149. / 4.— yf». Jng. App. 15. t. t. 



f, I. Chetnn. Cotich. 6. /. I./ 5. Gault. left. t. 102. 



/ C. Klein. Op. t. 10. / 47. Knorr. Vergn. 4. /. 25. 



/ 2. 



Tab. XIV. Fig. 5, 6. 

 The hinge of this fhell is very thick and rugged; the 

 tooth in the upper valve blunt, and uneven at the 

 top. On one fide there is a fulcus, which receives a 

 fmall tooth from the oppofite valve, at the fame 

 time that the large one fits into a correfponding 

 depreflion. 

 This, with the following fliell, completes Da CoftaV 

 genus of Mya. The two former he has placed 

 among the Chamce. 



piSlorum. 



Linn. Syjl. Nat. ed. Gmel. 3218. Penn. Br. Zool. No. ly. 

 t. OfT,. f. 17. Da Coft. Br. Conch, p. 228. /. 1 5. /. 4. 4. 

 — Elem Conch, t. "]. f.\%. Lift. Conch, t. lAH-f- 2, 3. 

 — An. Ang. t. 7.. f. 30. App. t. \. f. 4. Chemn. 

 Conch. 6i t. \. f. 6. Argcnv. Coneh. t. zy. f. 10.— 

 Zoom. i. S. f. 11' 



Tab. XIV. Fig. 7, 8. 



In the hinge of the M. piHorum we meet with an 

 arrangement of teeth different from any other of 

 the Britifh fpecies of this genus. 



Near the beak are fituated two upright teeth, one in. 

 each valve. The largeft of the two is ferrated. — 

 There are likewife three remote teeth, two in one 



fliell, 



