TRIBE MYARIA. 1 9 



Glycimeris Siliqua. Lam. 1. — Bl. t. 80. f. 3.— Reeve, t. 

 28.— Sow. G.—My\ Siliqua. D. p. 49.— Ch. fi 1934. Mya 

 Picea. W. t. 2. fi. 10. Thick, strong, oblong, covered with a 

 black friable epidermis and generally decorticated about the beaks ; 

 within, bluish white. I..I5. — Newfoundland. The valves are 

 often interna 11 y filled with a deposition of extraneous shelly matter." 



G. Edentula. Eich. Zool. Spec. — Mya E. Pallas Ilin. no. 

 93. — D. p. 48. — Wood y G. C. p. 96. Equivalve, oval, with a large 

 hiatus, white, somewhat grooved transversely, and marked with 

 about 33 striae on each valve, which are more distant at the narrower 

 than at the broader end ; hinge edentulous, with a thick reflected 

 lip. . 1 long. — Caspian Sea. 3 



TRIBE MYARIA. 



Shells having a broad spoon-like tooth in each valve, or in one 

 only ; gaping at both extremities, or only at one end : ligament 

 internal. 



MYA. 



Transverse, gaping at both ends, with one large dilated projecting 

 rounded and nearly vertical cardinal tooth in the left valve, and 

 with a hollow in the opposite valve : ligament internal, short, 

 thick and inserted in the hollow of the primary tooth, and in the 

 pit of the other valve. 



M. Truncata.* Lin. 1111. — X>. p. 42. —Lam. l.—Ch.f 1, 

 2.— Don. t. 92.— Pen. 4. p. 78. t. 41./. 14.— Turt. B. p. 31.— 

 Mont. p. 32.— List. t. 428.— W. t. 2. /. 1. Ovate, ventricose, 

 coarse, truncated at the anterior end, posteriorly rounded, ventral 

 margin nearly straight ; white, covered by a brownish-yellow tough 

 wrinkled epidermis, concentrically wrinkled ; tooth round, obtuse, 

 entire, and projecting forwards. 2 .. 2\. — N. Europe* 



M. Arenaria.* Lin. 1112.— Reeve.~t.33.— Sow. G. — Bl. t. 77. 

 f \.—D. p. 42.— Lam. 2.— Ch.fi 3,4.— Mawe. t.A.fi. \.—W.t. 

 2.fi. 2. — Don. t. 85. — M. Acuta and Mercenaria, Say. Ovate, 

 thick, rounded at both extremities, but slightly attenuated and pro- 

 duced at the anterior end, moderately ventricose, dull whitish or 

 pale chesnut under a wrinkled brown or chesnut epidermis ; inside 

 glossy white with the syphonal scar larger than in the last ; hinge 



2 G. Arctica, Lam. 2, is a Panopea. 



3 See too the Lseviuscula, Plicata, and Vitrea of the same work. 



4 M. Ovalis* Turt. Biv. is a young variety of this species. 



c 2 



