122 DE. T. DAVIDSON ON EECENT BEACHIOPODA. 



pale yellow. Two specimens measured — length 11 lines, breadth 8 lines ; length 

 9 lines, breadth 8 lines, depth 4 lines. 



In the interior of the dorsal valve the hinge-plate is widely divided, and between the 

 lateral portions are two large eye-shaped depressions left by the peduncle-muscles, 

 between which a slightly raised mesial septum begins and extends to about half the 

 length of the valve. From its anterior extremity arise low, short, deviating, flattened, 

 and forked lamellae expanded at then* extremities. 



Hab. South Africa, near the Cape of Good Hope. 



Ohs. This species is distinguished from Krcmssina rubra by its general shape, the 

 flatness of its dorsal valve, and its colour. In some specimens, such as in Sowerby's type, 

 the ribs are very little marked and obliterated near the margin, but in others they are 

 sharply defined ; the mesial depression is, at times, also scarcely perceptible. Both 

 K. cognata and K. rubra are, however, much more nearly related to each other than to 

 other species of the genus. Mr. Lovell Reeve alludes to the spine-like projections 

 round the inner margin of Kraussina cognata, a character common to several, if not 

 all, the species of the genus. I have noticed them in Kraussina rubra as well as in 

 K. Lamarckiana. At one time I was under the impression that the Terebratula cognata 

 of Sowerby might be an unusually large specimen of Kraussina pisum, but I am now 

 very doubtful whether such is the case. 



71. Kraussina Deshayesi, Davidson. (Plate XX. figs. 31-31 b.) 



Terebratula capensis, Adams & Reeve (uot of Gmelin), Voyage of H.M.S. ' Samarang,' p. 71, pi. xxi. 

 fig. 4, 1850. 



Kraussia Desliayesii, Davidson, Proc. Zool. See. p. 6, pi. xiv. figs. 20, 21, 1852 ; and Ann. & Mag. Nat. 

 Hist. vol. ix. p. 270, 1852; Woodward & Gray, Cat. of the Brachiopoda in the Brit. Mus. p. Ill, 1853; 

 E. Suess, Ueber die Wohnsitze der Brachiopoden, Sitzungsb. k. Akad. der Wissensch. Wien, Bd. xxxvii. 

 p. 211, 1859. 



Terebratula {Kraussia) Desliayesii, L. Reeve, Conch. Icon. Monogr. of Tereb. pi. ix. fig. 35, 18G1. 



Kraussina capensis, Adams & Reeve (not of Gmelin), Dall, Amer. Journ. of Couch, vol. vi. p. 140, 1870. 



Shell orbicular, subovate, about as long as wide, valves nearly equally deep or convex. 

 In the dorsal valve a deep longitudinal depression or sinus extends from the umbo to the 

 front, with a corresponding elevation or fold in the ventral one ; beak short, incurved, 

 and truncated by an incomplete foramen, margined anteriorly by the umbo of the dorsal 

 valve and by two small lateral deltidial plates; beak-ridges sharply marked, leaving 

 between them and the hinge-line a flattened space. Surface of valves marked with 

 numerous fine radiating riblets, increasing in number by the interpolation of shorter ones, 

 the whole surface of the valves being crossed by concentric lines of growth. Shell-structure 

 largely punctate. In the interior of the dorsal valve two deviating central lamella? rise 

 from the anterior extremity of the very slightly raised mesial septum. Colour light 

 yellow, marked with crimson rays. Length 5J lines, breadth 5 lines, depth 2 lines. 



Bah. Dredged by Sir Edward Belcher ofi" the Cape of Good Hope, in a depth of 

 120 fathoms. 



