A. E. Verrill — Catalogue of Marine Mollusca. 
507 
the beak there is a long, raised lateral tooth or lamina, separated 
from the margin by a deep ligamental groove. 
Length of the shell, 3 mU) ; from beak to ventral margin, 2‘5 mm . 
Off Martha’s Vineyard, station 949, in 100 fathoms, one dead 
specimen. 
If Verticordia and Pecchiolia are to be united, and the latter 
name used for the entire group, as has been done by Jeffreys, in his 
paper last quoted, this species will have to stand as Pecchiolia coelata. 
The two genera appear to me sufficiently distinct, however. 
Mytilimeria flexuosa Verrill and Smith. 
Verrill, Amer. Journ. Sci., xxii, p. 302, 1881. 
Plate LVIII, figure 38. 
Station 947, in 312 fathoms, 1881. One pair of valves, dead, but 
in good condition. 
Kennerlia glacialis (Leach) Carpeuter. 
Carpenter, Proc. Zool. Soc. London, Nov., 1864, p. 603. 
Pandora glacialis Leach, Ross's Voyage, appendix, p. 174. 
Leche, Kongl. Vetensk.-Akad. Hand]., xvi, p. 11, pi. 1, figs. 1 a, b, 1878 (author’s 
copy). 
Kennerlia glacialis Verrill, Amer. Journ. Sci., xx, p. 392, Nov., 18S0; Proc. TJ. S. 
Nat. Mus., iii, p. 397, 1880. 
This differs from the common Clidiophora trilineata Cpr. {—Pan- 
dora trilineata Say), in the absence of the internal radiating ridges, 
in its more inequilateral and irregular form, and in the greater con- 
vexity of the upper valve. The lower valve is very flat, or even 
concave, and is marked externally with several distinct radiating 
lines. 
Living specimens of this arctic shell were dredged at stations 873, 
918, 920, 949, in 45 to 100 fathoms, off Martha’s Vineyard. It had 
previously been recorded from Gaspe, Gulf of St. Lawrence, by 
Whiteaves, and Murray Hay, by Dawson. Spitsbergen, — Friele, 
Leche. 
Fossil in the Post-pliocene of Saco, Me., and St. John, N. lb 
Pholadomya arata Verrill and Smith. 
Pholadomya arata Verrill and Smith, in Verrill, Amer. Journ. Sci., xxii, p. 301, 
1881. 
Plate LVIII, figure 37. 
Stations 940, 949, 950, in 09 to 130 fathoms, 1881, south of 
Martha’s Vineyard. Three specimens, all dead, but one is very 
fresh. ’ Length, 3G" ,,n ; height, 29 mni ; breadth, 20""". 
