90 DR. T. DAVIDSON ON EECENT BRACHIOPODA. 



length of the shell ; mesial septum most elevated anteriorly, extending to within a third 

 of the length of the valve ; principal stems of the loop attached first to the hase of the 

 hinge-plate, and then at about a third of their length by a transverse lamella to the upper 

 edge of the anterior extremity of the septum, when, after extending for some distance, 

 they become widely reflected, the reflected lamella being much broader than that of 

 the principal branches. 



Sab. Dredged by Mr. A. Adams at Uraga in 21 fathoms; Gotto in 48 fathoms; 

 and at Satanomosaki in 55 fathoms : all in Japanese waters. 



Obn. This pretty little shell was briefly described, but not figured, in 1860 by A. Adams. 

 It is an imj)ortant species, and nearly approaches in shape and character to the 

 Upper Pliocene Terebratella septata, described by Philippi in vol. ii. of his work, ' Eauna 

 Molluscorum E-egni utriusque Sicilise,' p. 69, pi. xvii. fig. 7, 1814, and by Seguenza in 

 vol. i. Memorie della Soc. Ital. di Scienze Natural!, 1865. Terebratella septata is, 

 however, a much larger shell than the Japanese Terebratella Maivce, measuring 

 over an inch in length by ten lines in breadth. The principal branches of the loop 

 seem to be closer, and the reflected portion broader, than in the two specimens of the 

 recent shell that I have been able to examine. Dr. Gwyn Jeffreys considered Tere- 

 bratella MaricB to be the living representative of the Sicilian species ; but this point 

 cannot be definitely determined until more specimens of the Japanese species have been 

 examined and compared. 



UMcertain Species. 



46. Terebratella pulvinata, Gould, sp. (Plate XVI. fig. 15.) 



? Terebratula pulvinata, Gould, Proc. Boston Soc. Nat. Hist. vol. iii. p. 347, 1850; U.S. Exploring 

 Expedition, Shells, p. 467, pi. xliv. figs. 581 a-e. 



Terebratula [Waldheimia) pulvinata, Gould, Otia Coucli. pp. 97 & 255, 186.2; Cooper, Geogr. Cat. 

 California Moll. p. 3, no. 4, 1867. 



Terebratella pulvinata. Carpenter, Check-List West Coast N. Amer. Shells, 1860; Dall, Amer. Journ. 

 Conch, vol. vi. p. 117, 1870. 



Terebratula pulvilla, Carpenter, Rep. Brit. Assoc. 1856, p. 213. 



Sliell orbicular, about as broad as long, widest posteriorly, tapering anteriorly, sides 

 and front margins rounded, hinge-line obtusely angular. Dorsal and ventral valves 

 regularly convex ; beak small, truncated by a circular foramen lying close to the umbo 

 of the dorsal valve, but slightly separated from it by a small deltidium in two pieces 

 Colour light yellowish white. Length 10, breadth 10^, deptli 5 lines. In the interior of 

 the dorsal valve the loop is long and doubly attached, first to the base of the hinge-plate, 

 then to a mesial septum which extends from under the hinge-plate to about two thirds 

 of the length of the valve. 



Eab. Puget Sound, Oregon. 



Obs. I have only seen the figures given of this shell by Dr. Gould, and a photograph 

 of the type sent to me by Mr. Dall. I feel very uncertain with respect to its 

 specific value, and have long been under the impression that it might be only one 

 of the young stages of Waldheimia venosa. Mr. Dall, however, writes to me : — 

 " Terebratella pulvinata is, I believe, an excellent species. It resembles, externally, 

 the young flatfish forms of Waldheimia venosa, but it is a perfect and mature Terebratella 



