MUSEUM OF COMPARATIVE ZOOLOGY. Dai 
This species, which is quite distinct from any of our Northern forms, seems 
to be most nearly related to Cardiomya costellata Deshayes* ; but is too imper- 
fect to identify with certainty. 
Myonera paucistriata Datt. 
Dall, this Bulletin, XII. p. 802, 1886; XVIII. p. 445, 1889; Bulletin U. S. Nat. Mus., 
No. 37, p. 68, 1889; Proc. U.S. Nat. Mus., XII. p. 283, pl. 13, fig. 12, 1889. 
Non Necra paucistriata Bush, Trans. Conn. Acad., VI. p. 473, 1885. 
Plate II, Fig. 18. 
A badly smashed but living specimen, Station 325, off Cape Fear, N. C., in 
647 fathoms. 
Recorded by Mr. Dall as ranging from off Cape Fear, N. C., to off Tobago, 
in 193 to 880 fathoms ; living in 339 to 464 fathoms. 
I regret having to call attention to the inaccuracy in the synonymy of this 
species. Specimens from shallow water off Cape Hatteras, N. C., were for- 
warded to me from Washington under the manuscript name of Newra pauci- 
striata Dall, which name I accepted for my paper, quoted above, without 
question. The true Myonera paucistriata proves to be a quite different species. 
The shallow-water species is small, with an oblique, inflated form, and a 
well developed, upturned, gaping rostrum. It is ornamented on the posterior 
half with three or four conspicuous, divergent, radiating ribs, and a few faint 
riblets, crossed by numerous concentric undulations, which are most clearly 
defined on the anterior half of both valves. It should be placed under the 
subgenus Cardiomya, and may possibly be the C. costellata of Deshayes, recorded 
by Mr. Dall from the same locality. 
2 Periploma abyssorum VERRILL. (7?) 
Plate II. Figs. 12 and 13. 
The broken left valve? of a young specimen, Station 332, off Cape Hatteras, 
N. C., in 263 fathoms. 4 
A very large, new, and rare species recorded by the U. S. F. C. from east of 
Banquereau to off Chesapeake Bay, in 101 to 1,255 fathoms ; not living in less 
than 906 fathoms. 
Professor Verrill has kindly permitted me to give the following description, 
which was prepared by him from specimens dredged by the U.S. F. C., but has 
not as yet been published: — 
“Shell large, broad, rather depressed, thin and delicate, but not very trans- 
lucent, nearly equivalved, gaping somewhat posteriorly, the posterior end being 
bent a little to the right. The beaks are considerably behind the middle, 
1 Dall, this Bulletin, XII. p. 297. 
2 This fragment is hardly worthy of mention, but in the characters which are 
preserved agrees fairly well with the young of the above mentioned species in the 
F. C. collection. 
