DE. T. DAVIDSON ON EECENT BEACHIOPODA, 81 



it to me Mr. Dall wrote that it was his Terebmtella occkleiitalis, which may prove to be a 

 southern race of Terehratella transversa of Sowerby ; and I quite believe this to be the 

 case. The lines of growth, Mr. Dall states (under T. caurma, Eevision of the Terebratulidae, 

 Amer. Journ. Conch, vol. vi. 1870, pp. 120, 121), " are usually strong and often imbricated, 

 especially when the radiating ribs are strong. . . . The punctures are smaller, more cir- 

 cular, and fewer in number than in Terehratella pulvinata. An examination of the young 

 shells only about '2 inch in extreme width, showed some interesting points. The septum 

 is calcified very early, and is thick, prominent, bifurcate at its extremity, and serrated on 

 its anterior edge. The bifurcation is the first indication of the septal processes, which 

 are the last to be calcified ; and when the extremely thin hcemal processes are yet incom- 

 plete, the young shell closely resembles a Magas. In the beak of the neural valve just 

 inside the foramen, is a very prominent thin lamina or septum which half closes the 

 foramen. In the adult the muscular system is not largely developed. The pedicel 

 muscles are the strongest. The cardinals are slender and their bases are spread over a 

 wide extent of the neural valve, but the muscular impressions are imperceptible. The 

 adductors are small and slender. The brachia foUow the lateral loops of the apophyses 

 and cross below the mouth on the reflected portion and the septal processes. There is 

 no central spiral lobe. The fringes are in a single row, flattened and extremely thin ; 

 in an adult they are about "IS inch long. They are much more slender than in Terebra- 

 tulina or Megerlia. When fully extended they are far from the margin of the valves. 

 The mouth is circular, situated between the adductors. The visceral part of the system 

 is protected by a tliin tough membrane. The colour of the animal is reddish or brownish, 

 the ovaries vary in the same way. The perivisceral fluid is of a reddish-yeilow colour. 

 The umbones of both valves are generally eroded by contact with stones. The animal 

 seemed to have the power of turning half around on its peduncle at will." 



Although the name traiisversa, Sowerby, should be retained for the species, the 

 smooth variety is less abundant than the costated one. The ribs are, in some specimens, 

 quite simple, and the variety occidentalis has, according to Dall, been sometimes mistaken 

 for the Waldheimia Grayi, Davidson, from Japanese waters. 



39. Terebratella coreanica, Adams & Reeve, sp. (Plate XIII. figs. 3-9.) 



Poulette de la Tartarie, Lamanon, Voyage de la Perouse autour du Monde, vol. iv. p. 119, pis. 1 and 8, 

 1797. 



Terebratula coreanica, Adams & Reeve, Voyage of H.M.S. ' Samarang,' p. 71, pi. xxi. fig. 3, 1850. 



Terebratella coreanica, Davidson, Ann. & Mag. Nat. Hist. 2nd ser. vol. ix. p. 3G7, 1853. 



Terebratella Bouchardii, Davidson, Ann. & Mag. Nat. Hist. 2nd ser. vol. ix. p. 367, 1852, and Proc. 

 Zool. Soc. 1852, pi. xiv. figs. 4-6; Woodward & Gray, Cat. of the Brach. in Brit. IMus. p. 88, 1853; 

 E. Suess, Uebcr die Wohnsitze der Brachiopoden, Sitzungsb. k. Akad. Wissensch. Wicn, p. 206, 

 1859. 



Terebratella miniata, Gould, Proc. Boston Soc. Nat. Hist. vol. rii. p. 323, 1861. 



Terebratula {Terebratella) Coreanica, Reeve, Monogr. of Terebratula, Conch. Icon. pi. rii. fig. 28, a,b, 

 1861 ; A. Adams, Ann. & Mag. Nat. Hist. 3rd ser. vol. ii. p. 99, 1863; L. v. Schrenck, Reisen und 

 Forschungcn im Amur-Landc, Zool. p. 468, pi. xviii. fig. 7, 1867. 



? Terebratella Lamanoni, L. v. Schrenck, ibid. 1867. 



? Terebratella Coreanica, Carpenter, Supp. Rep, Brit. Assoc. 1863, p. 636. 



