Ill DE. T. DAVIDSON ON EECENT BEACHIOPODA. 



third or fourth of its length, when a flatfish mesial depression, about four lines in brcadtli, 

 commences and extends to the front. Ventral valve deeper and more convex than the 

 dorsal valve, keeled along its posterior half, gently depressed mesially along its anterior 

 half. Beak incurved, truncated by a small circular foramen, margined anteriorly by two 

 small narrow deltidial plates ; beak-ridges well defined, leaving between them and the 

 hinge-line a narrow flattened false area. Colour yellowish red, varying in intensity or 

 more vividly coloured at the concentric lines of growth, and sometimes rayed with 

 bright red. Length 1 inch 8 lines, breadth 1 inch, depth 7 lines. 



In the interior of the dorsal valve the loop is long, the hinge-plate divided along the 

 middle. Mesial septum, not very prominent, extends from between the hinge-plates to 

 rather less than half the length of the valve. 



The principal lamellse forming the loop after having become attached to the base of 

 the hinge-plate soon give off a horizontal lamina which attaches itself to the anterior 

 edge of the mesial septum, and after having attained its greatest length again becomes 

 reflected, the upper lateral portions of the deflected loop l)ecoming connected to the 

 principal stems by an oblique lamella, close to the point where the horizontal lamella 

 leaves for its attachment to the mesial septum. 



Hah. Dredged by A. Adams, from a clear stony bottom off the small island of 

 Kuro-Sima, at a depth of 35 fathoms, Japan; by Prof. R. Plumpelly at the wharf at 

 Yokohama, Japan ; and by Capt. St. John in the Strait of Corea, in from 23 to 35 fathoms. 



Ohs. Since Sowerby described this pretty shell in 1846, many much larger and finer 

 examples have been obtained from Japanese waters. The shell does not appear to vary 

 much in shape, and is distinguished from Laqueus 2^ict/(S by its straight or slightly 

 indented front. In 1870 Dall proposed a new species under the name of Laqueus suffusus 

 (PL XIX. figs. 6, 7 h), but this he relioquished in 1873, locating his so-termed species as 

 a synonym of L. ruheUvs ; but I am myself more inclined to regard it as a young 

 condition of Laqneus jjiclns. In colour L. rnbell as \a.vies considerably, some sjjecimeus 

 are ashy white, others are of a general salmon-colour, which deepens into orange-red near 

 the lines of growth or margins of the shell. In some examples, besides a general reddish 

 tint, a few rays mark the lateral portions of the shell, but these are rarely so strongly 

 defined as in Sowerby's figure, in which the coloration is exaggerated. 



G7. Laqueus pictus, Chemnitz, sp. (Plate XVIII. figs. 14-18.) 



Anomia pida, Chemnitz, Concli. -Cabinet, vol. xi. p. 247, pi. 203. figs. 2011, 2012, 1785 ? ; Anton, Yer- 

 zcicluiiss der Couch, p. 23, 1839. 



Terebratula picta, G. B. Sowerby, Thes. Conch, i. p. 351, pi. kx. figs. 43, 44, 1846; Kiister, ed. 

 Martini & Chemnitz, Conch. -Cabinet, pi. ii e. figs. 8, 9, 1813; Davidson, A Sketch of a Classification 

 of Eecent Terebmtuhe, Ann. & Mag. Nat. Hist. 2nd ser. vol. ix. p. 304, 1852. 



fVa/dkeimia picta, Wood\var(i & Gray, Catalogue of Brachiopoda in the Brit. Mus. ]). 59, 1853; 

 A. Adams, The Genera of Recent Mollusca, p. 575, 1858 ; E. Suess, Ueber die Wohnsitze der Brachiopodcn, 

 Sitzungsb. k. Akad. der Wisscnsch. Wien, Bd. xxxvii. p. 201, 1859. 



Terebraiu/a [IVuldhehiiia) picta, L. Reeve, Conch. Icon., Monogr. Terebratula, pi. iii. figs. 9 «, b, 18G0; 

 Ann. & Mag. Nat. Hist. 3rd ser. vol. vii. p. 175, I8G0. 



