NYMPHACEA. MOLLUSCA. TELLINA. 67 



SANGUINOLA'RIA SORDIDA. 



Shell sub-oval, thin, white, covered with a dusky epidermis ; an- 

 terior side semi-oval, and longest, posterior termination somewhat 

 angular ; hinge teeth, two in each valve, one of which is cleft. 



State Coll., No. 209. Soc. Cab., No. 2329. 



Tellina sordida, COUTHOUY ; Bost. Journ. Nat. Hist., ii. 59, pi. 3, f. 11. 



Shell sub-oval, compressed, thin and brittle, slightly gaping, in- 

 equilateral, the anterior side being longest and semi-oval ; behind 

 the beaks the margin declines rapidly in nearly a straight line, 

 forming a rounded angle as it joins the base, and bordered by a 

 faint, roughened wave ; surface somewhat undulated by the lines 

 of growth, especially on the anterior slope, and covered by a thin, 

 dusky or dirty-white epidermis ; beaks minute ; cardinal teeth two 

 in each valve, a large one which is cleft, and a very delicate one 

 which is seldom entire ; lateral teeth wanting, or consisting of a 

 feeble compression and elevation of the posterior hinge margin ; 

 sinus of the palleal impression nearly reaching the anterior muscu- 

 lar impression ; interior bluish-white. Length $ inch, height 

 fy inch, breadth |- inch. 



Found in considerable numbers, and in a fresh state, in fish caught 

 off Nahant. 



It is quite clear that this shell belongs to the same genus as Say's 

 Psammobia fusca. The hinge is precisely the same, and the 

 slight wave along the posterior margin is no more conspicuous than in 

 that shell. Its habit and general aspect are also the same. 



GENUS TELIJNA, LIN. 



Shell transverse, sub-equivalve, compressed, angular, and some" 

 ichat rostrated at the posterior end, where there is an irregular, wave- 

 like fold ; two small cardinal teeth, and generally two lateral teeth 

 in each valve. 



TELLINA TENTA. 



Shell white, oval, behind shortest, narrowed, very much warped 

 and widely gaping ; lines of growth very fine ; within polished, and 

 with numerous, fine, radiating lines. 



