82 DR. T. DAVIDSON ON EECENT BEACHIOPODA. 



Tercbratella Coreanica, Dall, Amer. Journ. Conch, vol. vi. p. 121, 1861, and Proc. Acad. Nat. Sci. 

 Philadelphia, p. 183, 1873 ; Davidson, Proc. Zool. Soc. 1 871, p. 304, pi. xsxi. figs. 4-5 ; G. Dunker, 

 Index IMollusc. Maris Japonici, p. 252, 1882 ; C. E. Leschke, Japonische Meeres Conchylien, Suppl. 

 p. 181, 1884. 



Shell large, semicii'cular, or somewhat transversely or elongated oval, broadest poste- 

 riorly, slightly winged, with an almost straight or obtusely angular hinge-line, or broader 

 about the middle, with a more obtusely angular hinge-line ; lateral margins flexuous, more 

 so in front. Dorsal valve convex, sometimes ventricose, channelled or depressed longi- 

 tudinally along tlie middle. Ventral valve deeper than the dorsal one, strongly keeled 

 longitudinally ; beak incurved and truncated by a circular foramen, incomplete in some 

 specimens, in others margined anteriorly by a deltidium in two pieces ; beak-ridges 

 strongly marked. In the interior of the dorsal valve the hinge-plate and cardinal process 

 are large and well defined ; a mesial septum of small elevation extends to about half the 

 length of the valve. Loop large, attached to the base of the hinge-plate and by a 

 transverse lamella to the anterior extremity of the septum before again proceeding and 

 doubling itself in the shape of a loop. Shell smooth, orange-red throughout, or fulvous- 

 white rayed with bright red, and traversed by concentric lines of growth stained with 

 red at their edges ; shell punctate. Proportions variable, a large example measured : 

 length 1 inch 10 lines, breadth 1 inch 11 lines, depth 1 inch 1 line. 



Bah. Corean Archipelago (Belcher) ; Ilakodadi, Japan, in 7 fathoms, and Straits of 

 Korea in 48 fathoms (A. Adams) ; dredged also at Hakodadi, in 1868, by L. v. Schrenck, 

 and in 1872 by Capt. St. John in Tsuga Strait, in 35 fathoms ('Sylvia' Expedition); 

 Sea of Tartary (Lamanon, Voyage de la ' Perouse,' 1798). 



Ohs. This beautiful large red species was dredged, if I am not mistaken in my identi- 

 fication, by Lamanon in 1797, iu the Sea of Tartary. He described and figured the shell, 

 its loops and labial appendages, with tolerable accuracy, and showed that its loop was 

 twice attached, although his large figure 11 is evidently incorrectly drawn. He gave it 

 the name of " Poulette de la c6te de Tartaric," and subsequently, in 1867, Dr. L. v. 

 Schrenck named it Terebrattila Lamanoni, after its discoverer. In 1850, Adams and 

 Reeve described and figured two smaller examples, delicately painted with irregular 

 crimson-scarlet rays, dredged by Sir Edward Belcher during the voyage of H.M.S. 

 ' Samarang,' under the name of Terehrtdella Coreanica; and this name must be retained 

 for the shell. To some larger examples Gould, in 1861, gave the name of Terehratella 

 miniata, and I now consider the shell I described in 1852 by the name of Terehratella 

 BoucJiardii to be merely an elongated bleached example of Terehratella coreanica. This I 

 am more ready to believe, as I subsequently procvired an exactly similar-shaped specimen 

 from tlie locality where Terehratella coreanica abounds, marked with red as in that species. 



Terehratella coreanica is extremely variable in shape, as may be seen from the illus- 

 trations I give of it in PI. XIII. figs. 3-9. The largest examples I have seen of the shell 

 were obtained at Hakodadi during Dr. v. Schrenck's Russian Government dredging-expe- 

 dition in Amur Land, 1854-56. Dr. v. Schrenck gives seven figures in pi. xviii. of his 

 work ; but fig. 7, representing the loop, is not correct, as I ascertained from a type specimen 

 he kindly presented to me shortly after his return. In the specimen in question the 



