M0LLU8CA — inCDUCV. 



30;" 



raisod radiatinj;- lyijc, kiiohhecl at the vciitni 

 in<^ towards the umbo. A pair of auri- 

 cuhii- ciuia occur on either side of the 

 hiiijj;c. The iiiii<,a' plate and ventral 

 niar.i;in are rou,i,diened by fine vermi- 

 culate scratches. Chondrophore minute, 

 triangular, the depth of the hinge plate. 

 Length, 6 ; breadth, 6 mm. 



This seems to represent the A. lucidum, 

 Jeffreys, of Northern Seas. 



One perfect right valve and several 

 fragments were taken off Port Kembla 

 in ()3-75 fathoms. 



margin and vanisFi- 



Amusium tiietidis. 

 Fig. 49. 



CYCLOPECTEN, Verrill. 



CYCLOPECTEN FAVUS, sp. nov. 



(Fig. 50') 



Stations 13, 49. 



Valves dissimilar in shape, size and sculpture. The left larger 

 and more convex, thin, 

 opaque white in the centre, 

 transparent at the peri- 

 phery, smooth except for a 

 few delicate concentric 

 growth lines. Hinge line 

 straight, about two-thirds of 

 the length of the valve; 

 auricles nearly equal, lat- 

 ticed by radiating and con- 

 centric threads. Umbo pro- 

 jecting, with a callus crest. 

 Ventral margin rounded, 

 produced posteriorly. 

 Hinge plate narrow, finely 

 wrinkled. Chondrophore 

 small, projecting into the 

 cavity of the valve. 



Right valve smaller, 

 overlapped ventrally by its 

 fellow, less oblique, pale 

 3'-ellow, opaque. Umbo not 

 projecting, auricles unequal, 

 the anterior narrow and 

 produced. Beneath it a 

 byssal notch, but no pecti- 

 nated teeth. Sculptured by 

 concentric a-rowth lines and 



CYCLOPECTEN FLAVU.S. 



Fig. 50. 



