A. E. Verrill — Mollusca of the Neio England Coast. 227 



specimens (No. 35,148); station 2084, N. lat. 40° 16' 50", W. long. 

 67° 05' 15", in 1290 fatlioms, seventy specimens (No. 34,862) ; and at 

 station 21 15, off Cape Hatteras, N. lat. 35° 49' 30", W. long. 74° 34' 

 45", in 842 fathoms, lifty living specimens (No. 35,581). 



It is recorded by Jeffreys, off the coast of Ireland, in 13G6 to 1380 

 fathoms; off the coast of Portugal, in 7i0 to 1095 fathoms; and 

 from the "Valorous Expedition," at station 12, in 1450 fathoms. 



Our specimens are regularly concentrically sculptured with narrow 

 grooves and I'aised lines. They agree closely with specimens labeled 

 as var. striolata, in Mr. Jeffreys' collection, at the National Museum, 

 with which I have compared them. They also resemble some of the 

 varieties of Y. pusio. 



Yoldia messanensis (Seguenza.) Variety. 



Leda acuminata Jeffreys, Anu. Mag. Nat. Hist., July, 1870, p. 69 (non Von BucL). 

 Seguenza, Nuculidi terziarie merid. d'ltal., R. Acad. Lincei, 1877, p. 1175, pi. 3, 

 figs. 15, 15a, 15e. 

 Leda 7nessa?iensis Jeffreji^, Proc. Zool. Soc. London, for 1879, p. 576. 



The specimens referred to this species most resemble the variety 

 brevirostris Seguenza, and differ considerably from the typical form. 

 Our specimens are small, broad-ovate, rather thick and swollen, with 

 the beaks nearly central and a little prominent. The postei'ior end 

 is somewhat acute, though blunt at tip, and a distinct, rounded ridge 

 runs from the beaks to the posterior extremity, and just in front of 

 this there is a distinct inflection of the surface and ventral margin, 

 without definite boundaries; the rest of the ventral margin is evenly 

 rounded and the anterior end is obtuse and regularly curved. On 

 the posterior dorsal margin, above the extreme tip, there is a slight 

 rounded angle, and from thence to the beak the outline is nearly 

 straight. The anterior dorsal margin is convex. The surface, when 

 fresh, is somewhat lustrous and iridescent, and covered with a pale 

 yellowish epidermis. The sculpture generally consists of very fine 

 concentric lines of growth, but in some specimens there are, toward the 

 margin, distinct concentric grooves and ridges, the grooves being 

 shallow, concave, with the ridges much narrower. The hinge-margin 

 is wide and strong, with large and broad teeth, of which there are 

 about nine on each side of the center; the cartilage-pit is very small. 



Length, 4'""'; ventral margin to beak, 3'"™. 



Station 2038, in 2033 fathoms (No. 35,212), two dead; station 

 2041, in 1608 fathoms; station 2042, in 1555 fathoms; station 2043, 



Trans. Conn. Acad., Vol. VI. 29 June, 1884. 



