DE, T. DAVIDSON ON RECENT BRACHIOPODA. 83 



reflected portion of the loop was mucli larger, and agreeing with the figure I give of it 

 on Plate XIII. fig. 7. 



I may also mention that searcli was made at the Jardin des Plantes for Lamanon's 

 specimens, but none of them could be discovered. 



Having examined some young examples of the shell under description, I found that its 

 loop underwent similar modifications to those I have described as taking place in 

 Terehratella ruhicunda. 



40. Terebratella Blanfordi, Dunker, sp. (Plate XV. figs. 9-12.) 



Terebratula Blanfordi, Dunker, Index Mollusc, maris Japonici, p. 251, pi. xiv. figs. 4, 5, 6, 1882. 



Sliell thin, nearly as wide as long, rotundate quadrate, lateral margins moderately 

 curved ; hinge-line obtusely angular, front line long, with a greater or less inward curve. 

 Dorsal valve moderately convex, with a broad shallow depression commencing at a short 

 distance from the umbo, and gradually widening as it approaches the front. Ventral valve 

 deeper and more convex than the dorsal one, with a similar broad depression commencing 

 at a short distance from the beak and extending to the front. Beak rather small, incurved, 

 and truncated by a circular foramen partly margined by a deltidium ; beak-ridges sharply 

 defined. In the interior of the dorsal valve the loop is long and doubly attached, first to 

 the hinge-plate and then to the median septum, before becoming reflected. Surfaces 

 smooth, marked here and there with fine concentric lines of growth. Colour dull yellow. 

 Length of a large specimen 13, breadth 12, depth 8 lines. 



Ohs. This remarkable and well-characterized species is well described and figured by 

 Dunker, who gives as its habitat Wakayama, Japan. It varies somewhat in contour ; 

 some specimens are more circular, and in some the frontal indentation is greater than in 

 others. Terehratella Ula nfordl is associated in the same sea-bottoms with Terehratullna 

 Crossil, Davidson, and Waldhe'imia Raphaelis, Dall. 



41. Terebratella spitzbergensis, Davidson. (Plate XVI. figs. 1-5.) 



Terebratula , Lyell, On the Proofs of a gradual Rising of the Land iu certain parts of Sweden, 



Phil. Trans. Roy. Soc. 1835, p. 3G, pi. ii. figs. 32, 33. 



Terebratula caput -serpentis, Hisinger, Lcthfea Suecica, p. 83, 1837 (not of Linnaeus). 



Terebratella Spitzbergensis, Da-iddson, Proc. Zool. Soc. 1852, p. 72; Ann. & Mag. Nat. Hist. 2nd ser. 

 vol. xvi. p. 442, pi. X. fig. 3, 1855; and Proc. Zool. Soc. 1871, p. 305, pi. xxx. fig. 13; M'Audrew, 

 List of the MoUusca from Spitzbergen, Ann. & Mag. Nat. Hist. 2nd ser. xvi. p. 465, 1855 ; O. Torell, 

 Bidrag Spitzbergens MoUuskfauna, p. 121, pi. i. fig. 1, 1859 ; E. Suess, Ueber die Wohnsitzeder Brachio- 

 padcii, Sitzungsb. k. Akad. Wissench. Wien, p. 204, 1859 ; L. Reeve, Conch. Icon. jjl. vii. fig. 2, 1861, 

 and Ann. & Mag. Nat. Hist. 3rd ser. vol. vii. p. 178, 1861. 



Magasella Spitzbergensis, Dall, Amer. Journ. of Conch, vol. vi. p. 37, 1870; Terebratella, id. Proc. 

 Acad. Nat. Sci. Philadelphia, p. 185, 1873. 



Terebratella spitzbergensis, Jeffreys, Proc. Zool. Soc. 1878, p. 409, pi. xxiii. fig. 2 ; H. Priele, The 

 Development of the Skeleton in the genus JValdheimia, Arch, flir Mathematik og Naturvidenskab, pi. vi. 

 1877; G. Dunker, Index Mollusc, maris Japonici, 1882, p. 252. 



Shell small, ovate, longer than wide. Valves uniformly and nearly equally convex ; no 

 fold or sinus in either valve ; beak in ventral valve moderately produced, incurved and 



SECOND SERIES. — ZOOLOGY, VOL. IV. 12 



