298 



" THETIS " SCIENTIFIC RESULTS. 



AUSTROSAREPTA, Hedley. 



AUSTROSAREPTA PICTA, Hedley. 



Austrosarepla picta, Hedley, Proc. Linn. Soc. N.S.W., xxv. 

 1899, p. 430, f. 1, 2. 



Station 49. 



Three sinsie valves from off Port Kembla in 63-75 fathoms. 



Family ARCIDJE. 



BATHYARCA, Xobelt. 



BATHYARCA PERVERSIDENS, sp. nov. 



(Fig. 45.) 



Stations 13, 49. 



Shell small, short, trapezoidal, solid, inflated, slightly inequi- 

 lateral, rounded anteriorly and 

 posteriorly, slightly sinuate at the 

 byssal gape, a faint depression 

 extending from the gape to the 

 beaks, which are prominent. 

 Sculpture : fine radial riblets, 

 about their own breadth apart, 

 here and their surmounted by 

 short scales, are traversed and 

 broken by concentric growth 

 furrows. Ligamental area narrow. 

 Hinoe line straight, narrow and 

 vertically striated for the median 

 third, broadened at either end, 

 anteriorly with two, posteriorlj'^ 

 with four irregulai'l}'^ horizontal or 

 oblique striated teeth. Margin 

 crenulated within, except around 

 the bj'ssal gape. Length, 3*25 ; 

 height, 2-5 mm. 



This species is included in the 

 genus Bathyarca, named by 

 Kobelt,* and defined by Verrill & 

 Bush.t 



Separate valves occurred plenti- 

 fully oft" Port Kembla in 63-75 

 fathoms, and off' Cape Three Points 

 in 41-50 fathoms. 



BaTHTARCA I'EEVERSIDENS. 



Fig. 45. 



* Kobelt—Conch. Cab., viii., 2, Area, JS91, p. 2U. 



t Verrill & Bush— l^roc. U.S. Nat. Mup., xx., 1S!)h, p. S42. 



