Ds 
—— 
\ 
A. EF. Verrill— Mollusca of the New England Coast. 227 
specimens (No, 35,148); station 2084, N. lat. 40° 16’ 50", W. long. 
67° 05' 15”, in 1290 fathoms, seventy specimens (No. 34,862); and at 
station 2115, off Cape Hatteras, N. lat. 35° 49’ 30”, W. long. 74° 34’ 
45”, in 842 fathoms, fifty living specimens (No, 35,581). 
It is recorded by Jeffreys, off the coast of Ireland, in 1366 to 1380 
fathoms; off the coast of Portugal, in 740 to 1095 fathoms; and 
from the “ Valorous Expedition,” at station 12, in 1450 fathoms. 
Our specimens are regularly concentrically sculptured with narrow 
grooves and raised 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, Ann. Mag. Nat. Hist., July, 1870, p. 69 (non Von Buch). 
Seguenza, Nuculidi terziarie merid. d'Ital., R. Acad, Lincei, 1877, p. 1175, pl. 3, 
figs. 15, 15a, 1be. 
Leda messanensis Jeftreys, Proc. Zool. Soe. 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 posterior 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. Acapv., Vou. VI. 29 JUNE, 1884. 
