Ch 
te 
S.d. p.47.—Wood. G. C. p. 102.—Turt. D.  p. 
103.—Oval, convex, slightly contracted in the middle, 
white or yellowish white and semi-transparent, with 
obscure and rather remote longitudinal raised striz ; 
beaks prominent, not quite central, teeth in one valve 
obscure. Adhering to Echini by slender filaments. 
M. Bipentata. Turt. B. p.60.—Mya B. Mont. 
44. t. 26. f. 5.—Lin. Trans. 8. p. 41.—Wood. 
G. C. p. 99.—D. p. 45.—F. p. 465.—Turt. C. D. 
p. 102.—Oval, smooth, rather produced at one end, 
whitish, but not glossy, and frequently covered with a 
rough coat; beaks nearer the broader end; one of the 
teeth oblique and spoon-shaped. 4%. im length. In 
old oyster shells. 
M. Ferrucinea. Turt. B. p. 6€0.—Mya F. Mont. 
p. 22. t. 26. f.2.—Wood. G. C. p. 100.—D. p. 46. 
—Turt. C. D. p. 102.—F. p. 465.—Oblong, slightly 
striated transversely, white, often cover-d or blotched 
with an ochracecus coat; becks placed near one end, 
obtuse; one of the teeth in each valve erect, the other 
much bent inwards and sloping downwards. 4....3. 
Scotch and Western Coast. 
M. Oxnonea. Turt. B. p. 61. t. 11. f. LI. 12.— 
