DE. T. DAVIDSON ON EECENT BEACHIOPODA. 115 



Waldheimia p'lcla, A. Adams, Ann. & Mag. Nat. Hist. 3rd ser. vol. xi. p. 99, 1863 ; Dal), Amer. 

 Journ. of Cuucb. vol. vi. p. 112, 1870. 



Laqueus pictus, Davidson, Proc. Zool. Soc. 1871, p. 301, pi. xxxi. fig. 10; G. Dunker, Index Moll, 

 maris Japonici, p. 252, 1882. 



Shell ovate, longitudinally oval, broadest about the middle, somewhat acuminated or 

 rounded anteriorly. Dorsal valve uniformly convex, no fold or sinus. Ventral valve 

 rather deejier than the dorsal one, beak incurved, slightly overlying tin; mnbo of the dorsal 

 valve, and truncated by a small circular foramen sHghtly se})arated form the hinge-line 

 by a deltidium in two pieces ; beak-ridges sharply defiued, leaving between them and the 

 hinge-line a narrow flattened false area ; marginal line almost straight. Colour yellowish 

 red, sometimes bright red and marked in an irregular manner with zigzag light-yellowish 

 ramifying spots. Length 1 inch 4* lines, breadth 1 inch, depth 8 lines. 



In the interior of the dorsal valve the hinge-plate is well defined and notched along 

 the middle ; no distinct cardinal process. A slightly raised mesial septum extends along 

 the bottom of the valve from the middle of the hinge-i^late to less than half its length ; 

 the loop is long ; the principal stems, after having become attached to the base of the 

 hinge-plate, soon give off a horizontal lamella, which become attached to the anterior 

 edge of the mesial septum, and again extends until it reaches its greatest length, when it 

 is deflected to form the loop ; before the reflected part has attained its terminations it 

 gives off on each side an oblique lamella which becomes attached to the principal 

 stems of the loop, close to the point whence the horizontal lamella leaves for its attach- 

 ment to the mesial septum. 



Hab. Dredged by A. Adams, in 55 fathoms, off Satanomosaki, Japan, and by Capt. 

 St. John, in 23 and 24 fathoms, in the Corea Strait. 



Ohs. This is a fine shell, much sought after by collectors. Its red colour is rarely as 

 bright as it is sometimes represented to be, the shell being generally of a dull yellow-red 

 with radially interrupted spots of light yellow. Young sjjecimens tajier considerably 

 anteriorly, are broader posteriorly, and of a salmon-colour. L. pictus has been successively 

 placed in the genera Terebratula, Terebratella, and Waldheimia ; but I Avas at last able 

 to ascertain that its loop was positively that of a Laqueus. L. Reeve gives Terebratula 

 erythroleuca, Quoy, as a synonym of the species under description ; but this is a mistake, 

 for it is really a synonym of the Anomia sanguinea of Chemnitz. He also quotes Java 

 as the habitat of Laqueus pictus, but I have never seen any specimen from that locality. 



Subfamily MAGASlNiE. 



Genus BOUCHARDIA, Davidson, 1849. 



Of tliis genus only one species has hitherto been discovered ; its generic characters 

 have been described under Bouchardia rosea and need not be repeated here. 



68. Bouchardia rosea, Mawe, sp. (Plate XX. figs. 13-18.) 



Anomia rosea, Mawe, Intr. to Conch, tab. iv. fig. -l-, 1823. 

 SECOND SEBIES. — ZOOLOGY, VOL. IV. 16 



