MOLLUSCA KHOM EIf;HTY FATHOMS — IIEDLEY. 301 



This species appears to be the c-Dinmoiiest ' 'rnssafeUifis cm our 

 continental shelf. Besides the present station, where it occured 

 plentit'ulh', Mr. Halligan and I (h-edged numerous specimens in 

 lUO fathoms, sixteen miles east of Wollongtmg. In both these 

 localities it was associated with <■ '. securi forme. But the record 

 of ('. sc'cnri forme from 111 fathoms off Cape Byr<m,-'' is, T regret 

 to say, based on a single valve of 0. 'hscns. 



Myodora ALBiDA, Te7i. Woods. 



Myodora albida, Ten. Woods, Proc. Roy. Soc. Tas., 1875 (1876), 

 p. 160. J/. (•orrn(/af((, Verco, Trans. Roy. Soc. S. Austr. xx., 

 1896, p. 229, pi. "viii., f. 1. 



This species has not l)een noted from the coast of New South 

 Wales. A single liroken valve was secured b}' the expedition. A 

 perfect specimen occurs in the Hargreaves collection labelled 

 " outside Sydney Heads." It was probably dredged when a 

 pai-tv of Sydney Natui-alists were entertained on board H.^I.S. 

 " Clmllenger. "•-•'" 



CoRiAREUS, yen. nov. 



A genus allied to Lastm, with a weaker, less complex liinge, 

 a larger, thinner, radiately sculptured valve clothed with a thick 

 dense epidermis. Type, C. vitreus, Hedley ; second species, 

 Montaenta semiradiata, Tate.* 



CORIAREUS VITREUS, .S/:>. nOV. 



(Plate Ivi., figs. 28, 29, 30). 



Valve ovate-oblong, slightly inflated, equivalve, closed all 

 round, inequilateral, posterior twice the lengtli of the anterior, 

 highly polished, thin and brittle. Colour, milk white. The 

 epiflermis is peculiar : a thick, dense, felted, entire 

 rusty-brown coat, which appears as if some foreign 

 substance had caked on the valves, and which flakes away when 

 dry in irregular masses. Sculpture : a few distant, concentric, 

 raised threads mark rest stages in growth ; there are numerous 

 sharply elevated, thin, radial riblets, irregularly disposed 

 and spaced, but chiefly grouped in the centre of the valve; 

 towards the margin additional riblets are inteicalated. Hinge : 



^ Hedlev Rec. Austr. Miis., vi., 2, 1906, p. 42. 

 2» Sprv-' Cruise of Cliallenger, 1876, p. 169. 



30 Tate— Trans. Rov. Soc. S. Austr., 1888., p. 63, pi. xl., f. 2 ; Hedley— 

 Proc. Linn. Soc. X. S. Wales, 1906, p. .'542, pi xxxi., f. 1-2. 



