lOO "ENDEAVOUR" SCIENTIFIC RESULTS. 



This species is nearest related to Chione despecta, Hedley,i 

 from loo fathoms oft Wollongong, New South Wales, than 

 which the novelty is larger, more inequilateral, longer in pro- 

 portion to height and more closely ribbed. When I described 

 C. despecta seven years ago I failed to distinguish the muscle 

 scars. Now I find there is no pallial sinus. But the dis- 

 crepancy between its hinge and that of typical Chio7ie warned 

 me of possible error. Revising the generic position with the 

 aid of the new and related species, I am now constrained to 

 refer both to Corbis. Hitherto only a single recent species, 

 a large and handsome shell from the coral reef zone, has been 

 admitted to this genus. The hinge characters do not exactly 

 correspond. These two small species appear to have suffered 

 such atrophy as descent to calm, deep water might be 

 expected to induce in the hinge development of small and thin 

 shells. 



Hah. — Numerous specimens in loo fathoms forty miles- 

 south of Cape Wiles, South Australia. 



Chione mesodesma, Qiioy c!"-^' (kiimard. 



Venus uicsodesma, Quoy &' Gaimard, \'oy. "Astrolabe,"" 



Zool., iii., 1835, p. 532, pi. lxxxi\-., f. 17, 18; id.. Smith,. 



Rep. Voy. Chall., Zool., xii., 1885, p. 131. 



A few specimens in 100 fathoms forty miles south of Cape 



Wiles. >Ir. W. L. May and I took it in abundance in 10& 



fathoms off Cape Pillar, Tasmania. 2 These specimens were 



worn, and, without close scrutiny, were passed for Chione- 



gaUifuihi, Lamarck. This is the first definite Australianr 



record, though New Holland was assigned to the species in 



the original description. 



B. GASTEROPODA. 



PUN'CTIRELI.A EI'MAKUM, Sp. HOT. 



(Plate xviii., figs. 13, 14.) 



vShell laterally compressed, thin, translucent, erect, the 

 posterior profile usuallv slightly convex and the anterior 

 slightly concave. Sculpture : Delicate concentric growth 

 lines, small tubercles, conspicuous in profile, are set in radial 

 rows. Summit irregularly notched, subcircular seen from 

 above, cleft with a short, steep posterior limb seen from the 

 side, the spiral apex disappearing from half-grown specimen^ 

 Septal plate deeply inserted, nearly perpendicular. Length 

 2'i5, breadth i'35, height i'85 mm. 



1 Hedley— Proc. Linn. Soc. N.S. Wales, xxviii., 1904. p. 193. pi. x.. f. 35-8. 



2 Hedley & May— Rec. Austr. Mus.. vii.. 1908, p. Ill 



