DE. T. DAVIDSON OX EECENT BEACIUOPODA. 11 



liuc flexuously rounded in front ; ventral valve deeper than the dorsal one ; beak incurved, 

 moderately produced, obliquely truncated by a large circular foramen sejiarated from the 

 hinge-line by a narrow concave deltidium. Surface smooth, marked by fine concentric 

 lines of growth. Shell finely punctated. Loop short, simple. Length 1 inch 1 line, 

 width 8 lines, depth 6 lines. 



Hal). Mr. Broderip states that this species was obtained at Tehuantepec by Capt. 

 Dare, while dredging for 3Icleagrince margaritiferce, attached to a dead sea-worn bivalve, 

 at a depth of 10-12 fathoms, and on a bottom of sandy mud. The type, formerly in 

 Mr. Cuming's collection, is now iu the British Museum. The shell was also trawled by 

 the ' Challenger ' Expedition off Twofold Bay, iu 120 fathoms, and dredged off Buenos 

 Ayres by the same expedition at a depth of GOO fathoms, and again off Heard Island, 

 lat. 52° 4' S., long. 71° 22' E., at a depth of 150 fathoms. 



Obs. Ltolhyris uva varies much in shape ; it is usually longer than wide, and oval, but 

 in some examples the length and depth do not differ materially. 



4. LiOTHYKis MosELEYi, Davidsou. Plate II. figs. 1-4. 



Terebratula Moseleyi, Davidson, Proc. of the Royal Society, vol. xx^ii. p. 43G, 1878 ; Report ou the 

 Brachiopoda, Voyage of H.M.S. ' Challenger,' Zool. vol. i. p. 30, pi. ii. figs. 12-1 1, 1880. 



Shell broadly ovate, semiglobose, rather longer than wide, broadest anteriorly, slightly 

 tapering posteriorly, marginally and laterally convex, nearly straight in front, margin 

 sometimes thickened, surface smooth, white. Dorsal valve uniformly convex, without 

 fold or sinus ; A^entral valve slightly deeper than the dorsal one, uniformly convex ; beak 

 moderately produced, slightly incurved and truncated by a circular foramen separated 

 from the hinge-line by a very narrow and small deltidium, beak-ridges not defined. 

 Loop in dorsal valve short and simple, labial appendages occupying about two thirds of 

 the length of the valve, united to each other by a membrane, the central coil making 

 about three turns. Shell-structure perforated by numerous small canals. Colour white. 

 Length 11, breadth 10, depth 7i lines. 



Hab. Dredged by the ' Challenger ' Exjoedition, west of Kerguelen Island, at a depth 

 of 210 fathoms. Types in the British Museum. 



Obs. I have reproduced the description I have given in the ' Challenger ' Report. 

 Five examples of this shell were obtained, all of about the same dimensions. It seems 

 to be a smaller and more circular species than L. citrea and L. sjj/ieuoidea. It is less 

 elongated, and not quite so convex as the last-named species, and does not present the 

 flatness and angularity observable in the mesial and lateral portions of the ventral valve 

 of Ij. sjjhenoidea or in its synonym I/, cubensis. 



I made an examination of the animal of one of the specimens, which did not differ 

 materially from that of i. viti^ea. The mantle is thin, and not furnished with seta3 at 

 its edges. On the dorsal lobe of the mantle I distinctly observed the ramified, bifurcated, 

 flue, thread-like pallial nerves as well as the pallial sinuses, muscles, and brachial or 

 labial appendages, these last occupying a much smaller space in the interior of the 

 shell ; and while the labial branches are visibly shorter, the cirri are of considerable length. 



