44 



prominent ; teeth rounded and projecting inwards. |. 

 .fi Dublin Say. 



TRIBE. MACTRACEA. 



Equivalve, frequently gaping at the lateral extremities, 

 with the ligament internal or partly external . 



GENUS. LUTRARIA. 



Inequilateral, transversely oblong, or rounded, gaping 

 at the extremities ; hinge with either a somewhat 

 complicated tooth, or two, one of which is simple 

 with an adjoining deltoid hollow which is oblique 

 and prominent within ; no lateral teeth; ligament 

 internal, attached in a pit. 



L. OBLONGA. Turt. B. p. 64. t. 5./.G. - MYA. 0. 

 Gm.322l' Ch.f. 12. MACTRA HiANs.Dora. t. 140. 

 Mont. p. \Q\.Pen. 4. p. 196. Lin. T. 8. p. 74. 

 Dor. Cat. p. 33. t. 2. f. 4. D. p. U6-Turt. 

 D.p.Sd.f. 41. Da. Cos. t. 17. f. 4. L. SOLEN- 

 OIDES. Lam. 1. Bl. t. 77. /. 3. Sow. G. f. 1. 

 L. HIANS. F. p. 464. Oblong, posteriorly short and 

 rounded, anteriorly produced and obtuse, margins 

 subparallel, the dorsal slightly incurved ; yellowish or 

 reddish white under a thick dusky epidermis, irregularly 

 wrinkled transversely : hinge with a grooved flattish 

 tooth locking between two. 2i...5. W. Counties. 



