102 



A. TETRAGONA. Lam.Turt. B. p. 167. t. 13. /. 1. 

 F. p. 398. Obliquely quadrangular, whitish brown, 

 with granular decussations, tumid at the beaks from 

 which proceed a nearly central rib to the angular point 

 of the opposite margin; hinge not quite straight in con- 

 sequence of the marginal slope, ventral edge gaping ; 

 inside white with a purplish blotch at one end. ...1. 

 W. Ireland. 



A. BARBATA. Brown in Wern. Soc. 2. p. 512. t. 24. 

 /. 3. F.p. 398. RETICULATA. Turt. B. p. 168. 

 Oblong, rather compressed, rounded at one end and 

 slightly angular at the other, white under an olive 

 brown skin, with numerous nearly equidistant flat ra- 

 diating ridges, covered with a fine brown downy pile 

 and decussated by minute striae; ventral edge straight 

 and nearly closed ; beaks nearer one end and rather 

 approximated; inside glossy with pale rays. $...1,014. 

 Lough Strangford. 



* * Margin entire. 



A.LACTEA. Lin. 1141. D.p. 13$. Lam. 17. List. 

 t. 235./. 69. Pen. 4. p. 216. t. 61. /. 2. Da Cost. 

 p. 171. t. 11. /. 5. Mont. p. 138. Don. 4. t. 135. 

 Lin. T. 8. p. 92. Dor. Cat. p. 36. t. 11. /. 5. 



