306 



THETIS SCIENTIFIC RESULTS. 



superficially by numerous fine, irregular, radiating threads, con- 

 nected by close-set transverse bars which include narrow hexagonal 

 spaces. This structure is seen to peel off in places, and is, 

 therefore, probably epidermial, and perhaps corresponds to the 

 pustules of the Atlantic species. 



Left valve, length, 3-2 mm. ; height, 2-7 mm. 



Right valve, length, 2-6 mm. ; height, 2-5 mm. 



The species is referred to Verrill's genus Cyclopecten,''''' one 

 member of which, C. murrayi, Smith,! has already been reported 

 from Australia. 



This and the next are readily distinguishable from co-generic 

 forms by their obliquity and the honej'comb structure of the 

 right valve. 



A couple of perfect shells and numerous separate valves were 

 taken off Port Kembla in 63-75 fathoms, and off Cape Three 

 Points in 41-50 fathoms. The Museum contains specimens which 

 Mrs. Helena Forde collected ^n the beach at Pambula, N.S.W. 



CYCLOPECTEN OBLIQUUS, sp. nov. 



(Fig. 51.) 



Stations 13, 49. 



This species is slightly larger than the preceding, which it 

 closely resembles. Without a lens the right valve of C. obliqims 

 is indistinguishable from that of C. favus ; my drawing would 

 stand equally well for either. Under high magnification, and by 

 transmitted light, the liexagonal spaces in C. obliquus, but not in 



C. favus, appear to be stippled. 

 From this cause, by reflected 

 light, the valve of C. favus is 

 glossy, that of C. ohliqitus dull. 

 The left valve (fig. 50) is 

 easily distinguished by its 

 elevated concentric lamellfe, 

 about 35 in number. Between 

 the lamella; are irregular veins. 

 The valve figured is 4-6 mm. 

 in length and 4*2 mm. in 

 bi'eadth. 



Numerous separate valves 

 and a perfect specimen occurred 

 off Cape Three Points in 41-50 

 fathoms, and off Port Kembla 

 in 63-75 fathoms. 



Cycloi'ectkn obliquis. 

 Fig. 51. 



* Verrill— Trans. Connect. Acad., x., 1899, p. 70. 



+ Hniith— Chall. Rep., Zool., xiii., 1885, p. 303, pi. xxii., f. 1. 



