60 INVERTEBRATA OF MASSACHUSETTS. 



destitute of any apparent muscular or palleal impressions except in 

 very old specimens, but faintly marked with radiating lines. Hinge 

 consisting of two teeth diverging from the beaks, so as to leave a 

 triangular vacancy between them ; one of them considerably 

 elevated, and more so in one valve than in the other, while that on 

 the shorter side scarcely rises, at its tip, above the edge of the 

 valve, and its inner surface is excavated and receives the ligament. 

 Length nearly J inch, height ^ inch, breadth T ^ inch. 



Found by Mr. C. F. Shiverick, in New Bedford harbour. 

 Only a few specimens have, as yet, been obtained. 



It is very difficult to refer, with certainty, so small a shell to any 

 described species or even genus. However, by means of specimens 

 of M. substriata furnished me by Dr. Loven, I have become fully 

 satisfied as to the genus. It seems also to accord sufficiently well with 

 the M. bidentata to warrant us in designating it as that species. It is 

 probably a borer like its European co-species, and may, most likely, 

 be found abundantly in the antiquated surfaces of old and thick oyster 

 shells. 



GENUS KELLIA, TURTON. 



Shell somewhat globular, equivalve, closed ; hinge with two ap- 

 proximate teeth, and a remote lateral tooth in one valve, and a 

 concave tooth and remote lateral one in the other. 



K^LLIA RUBRA. 



Shell sub-oval, white, with a thin, purplish epidermis ; leaks 

 prominent. 



FIGURE 23. 

 State Coll., No. 216. Soc. Cab., No. 2321. 



Cardium rubrum, MONTAGU ; Brit. Shells, 83, t. 27, f. 4. PENNANT ; Brit. Zool., 



iv. 189. WOOD ; Gen. Conch., 213. DJLLWYN ; CataL, 131. 

 Cardium loeve, WALKER; Test. Minut., 24. 

 Tellina rubra, TURTON ; Conch. Diet., 168. 

 Kellia rubra, TURTON ; Brit. Biv., 58. FLEMING ; Brit. Mm., 430. 



Shell minute, rather thick, sub-oval, very inequilateral, rather 

 compressed ; beaks rather prominent, and in contact, having 

 before them a deeply excavated, elongated, smooth areola ; ends 



