10 DE. T. DAVIDSON ON EECENT BEACHIOPODA. 



Colour light yellowisli white ; loop small and simple. Length 10, width 7, depth 

 6 lines. 



Hah. Dredged by A. Adams at Satanomosaki, Japan, in 55 fathoms. 



Ohs. I am not quite certain that this small species is really a variety of L. vitrea. I 

 have seen only two examples of the shell, and they much resemble the typical var. 

 minor. One of the specimens bore some resemblance to young examples of Liothyris uva 

 from the Gulf of Tehuantepec, but diifers from it, according to A. Adams, in its more 

 solid structure and globose form, and in the foramen being smaller and entire. More 

 Japanese examples will have to be examined before tlie variety can be definitely 

 accepted. 



2. Liothyris arctica, Eriele, sp. (Plate I. figs. 17, 18.) 



. Terebratula arctica, Friele, Sserskilt Aftryk af Nyt Magazin for Natm'videnskaberne, pi. i. fig. i.^ 

 1877. 



Shell small, globose, broadly ovate, rather longer than wide. Valves smooth, glassy, 

 semitransparent, Avhitish ; dorsal valve convex, squarely circular, without fold or sinus ; 

 ventral valve very convex and deep ; beak unusually short, slightly incurved and 

 truncated by a very small foramen margined anteriorly by rudimentary deltidial plates; 

 loop very small and simple. Length 7, breadth 6, depth 4 lines. 



Hab. Dredged by Herman Priele some few miles south-west of Jan Mayen, in 263 

 fathoms depth. Shell abundant, but so brittle that most of the specimens were broken 

 during the dredging-operation. 



Ohs. After having carefully compared a specimen of the shell under description, sent 

 to me by Friele, with others of the var. minor to which it had been referred by 

 Dr. Jeffreys, I could, as Friele had previously done, discover several differences which, 

 although not very great, have induced me to follow its discoverer in considering it a 

 distinct species. L. arctica is much more globose and squarely rounded than L. minor, 

 which is more of an elongated oval. As stated by Eriele, its form approaches most to 

 L. minor of Philippi, but the deviation is shown in the shorter beak and by the position 

 of the foramen, which, in i. arctica, is placed directly above the dorsal valve, the 

 deltidium bekig almost hidden. The loop in i. arctica is very much weaker and 

 thinner, and the cru.ra processes are placed further apart than in Jj. minor. It is the 

 first representative of the genus Liothyris that has been hitherto found in Arctic seas. 



3. Liothyris tjva, Broderip, sp. (Plate II. figs. 5-7.) 



Terebratula uva, Broderip, Traus. Zool. Soc. Lond. vol. i. p. 14.2, pi. .xxii. fig. 2, 1833; Sowerby, Thes. 

 Concli. vol. i. p. 353, pi. Ixx. figs. 53-55, 1846; Reeve, Monogr. of the genus Terebratula, Couch. Icon, 

 pi. iii. fig. ii., 1860 ; Dall, Cat. of the recent species of the Class Brachiopoda, Proc. Acad, of Nat. 

 Sciences of Philadelphia, 1873; Davidson, Report on the Brachiopoda, Voyage of H. M.S. 'Challenger,' 

 Zool. vol. i. p. 31, pi. ii. figs. 3 & 4, 1880. 



Shell oblong-oval, posteriorly compressed on each side, longer than wide, slightly 

 diaphanous, white or of a very light salmon-colour. Dorsal valve convex ; marginal 



