TRIBE MYARIA. 19 



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

 28.— Sow. 6^.— Mya Siliqua. D.p. 49.— Ch. f. 1934. Mya 

 PiCEA. W. t. 2. /. 10. Thick, strong, oblong, covered with a 

 black friable epidermis and generally decorticated about the beaks ; 

 witliin, bluish white. I..l|. — Newfoundland. The valves are 

 often internally Jilled with a deposition of extraneovs slielly -matter,- 



G. Edentula. Etch. Zool. Spec. — Mya E. Pallas Itin. no. 

 93. — D.'p. 48. — Wood, 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.^ 



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.— i>. p. 42.— Lam. l.—Ch.f. I, 

 2.— Don. t. 92.— Pen. 4. p. 78. t. 41. f \4.—Turt. B. p. 31.— 

 Mont. p. 32.—List.t.42S.— W. t. 2. f. 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. \\\2.— Reeve. t.33.—Sow. G. — Bl. t. 77. 

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

 2.f. 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 



- G. Arctica, La7n. 2, is a Panopea. 

 ^ See too the Lseviuscula, PUcata, and Vitrea of the same work. 

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



c 2 



