28 THE NAUTILCS. 



from Mr. R. E. Call, and placed among his "pyramidata." Mr. 

 William A. Marsh has examples, which have been labeled 

 " southern variety of pyramidata." Mr. Walker thinks the shell 

 is however a Pleurobema, rather than a Quadrula and he places it in 

 the scheme of classification next to Pleurobema taitianum, Lea. 

 Compared with that species, ours is less convex, with a more or less 

 distinct sulcus back of the convexity. Uniologists having southern 

 pyramidata, may perhaps find specimens of P. tombigbeanum in the 

 lots. 



SOME NEW BRACHIOPODS. 



BY WM. H. DALL. 



During the researches of the U. S. S. Albatross party in 1906 a 

 good many brachiopods were obtained, and the range of some known 

 species much extended. The examination indicates that two species 

 of those obtained are undescribed. Diagnoses are now given and 

 figures are in preparation. 



Terebratula (Liothyris) sakhalinensis n. sp. 



Shell large, solid, of a rather dark and ruddy brown color and 

 nearly smooth surface which bears faint concentric lines of growth 

 and usually fainter, irregularly radial impressed lines on the anterior 

 portion of the shell ; valves moderately convex, the anterior margins 

 slightly flexuous, the middle of the ventral valve is slightly squarely 

 impressed and produced, the extension fitting into an analogous 

 excavation in the dorsal valve ; beak stout, moderately recurved, 

 usually much eroded, with a large, entire foramen ; the deltidial 

 plates form a solid arch with no mesial groove ; internally a thick- 

 ened collar or short tube surrounds the peduncle, and an evident, 

 but not prominent, short septum extends mesially about 2 mm. from 

 the collar forward, in one specimen. Hinge of the ventral valve 

 solid, with no props to the dental processes ; in this valve the pallial 

 sinuses exhibit two strong parallel trunks which extend nearly to the 

 anterior margin before they begin to bifurcate ; the genital glands 

 extend as a fine, brown, irregular reticulation over the main cavity 

 of the sinuses outside the inner line of the respective trunks on either 

 side ; dorsal (or hasmal) valve with a small but evident cardinal 



