PROCEEDINGS OF THE NATIONAL MUSEUM. 719 



Station 3362, in 117.5 fathoms, nmd, off Cocos Tslanrl in the Gulf of 

 Panama ; bottom temperatnre, 36.8° F. ^o. 107275, U.S.N.M. 



A single specimen of this modest little shell was obtained. It differs 

 from L. davidsonij Adams, in its incomplete foramen and less flexnous 

 margin ; it is less inflated and somewhat smaller. From the young of 

 L. uva, Broderip, which is (notwithstanding it has been called 

 "smooth") a finely regularly microscopically striate shell, it maybe 

 distinguished by its smooth surface. L. arctica, Friele, is less like it 

 than Davidsoni is ; and, in short, while the shell has no very marked 

 characters, it can not be safely referred to any described species. 

 Though small, by the solidity of its hinge armature and the manner in 

 which the foi\amen is worn by the peduncular motion, it would seem 

 to be an adult shell. 



Though the shell was in a dry condition when taken up for study, 

 the soft parts were well preserved, and present the peculiarity of having 

 the lateral bands of brachia quite close to one another and rather long; 

 the space between them is smooth and occupied by a stretch of mem- 

 branous tissue, while the central whorl of brachia is below, and, looking 

 vertically down upon the valve placed horizontally, is invisible, the 

 cirrhi, of course, being contracted by drying. It is only on looking 

 sidewise at the valv^e that the coil is seen under the membrane above 

 mentioned and lower than the lateral brachial loops. On soaking the 

 remains in fresh water they expanded considerably and assumed a 

 fairly natiTral elasticity, but the relative position of the median 

 brachial coil remained the same. The external appearance of this shell 

 is almost exactly like that of Macandrevia cranium of the same size. 

 The species is named in honor of J. M. Clarke, esq., associate of Prof. 

 Hall in the revision of the Paleozoic Brachiopoda. 



It is not likely that this species can be related to Liothyrinastearnsii, 

 Dall and Pilsbry, which is a native of Japan (pi. xxx, figs. 8, 9, 11), as 

 that species has a complete foramen, but the flgnires are given for 

 comparison with the other species. 



Genus TEREBRATULINA, Orbigny. 



TEREBRATULINA CAPUTSERPENTIS, L i n n ic u s . 



Plate XXXII, figs. 2, 5. 



TerebratuUna caputaei-pentis yar. unguicula, Davidson, Mon. Rec. Brach. Ft. i, p. 



25, 1886. 

 Terehratnla unguicula, Carpenter, Proc. Zool. Soc, 1865, p. 201, figs. 1^.— Dall, 



Am. Jouru. Conch., vi, 1870, p. 102. 



Stations 2849, 3311, 3330, 3350, and many others, in from low water to 

 500 fathoms, temperature 40° to 44° F., from the southern part of 

 Bering Sea southeast to the coast of California in latitude 33° K, and 

 southwest to Japan and Korea. Also the IsTorth Atlantic, the upper 

 Tertiary rocks of Europe, etc. Figured specimen No. 123155, U.S.N.M. 



For some time I was disposed to regard the North Pacific form as 



