BY C. HEDLEY. 70 1 



courtesy of Dr. P. Bartsch. I have not yet recognised the species 

 among the fauna of New South Wales; possibly it is exotic. 

 When I saw a single valve, which constitutes the type, I was 

 reminded of My sella anomala Angas. But on comparison of 

 actual specimens by Dr. Bartsch, it proved different. 



Neolepton novacambrica, sp.nov. 

 (Plate Ixxix., figs.29, 30, 31, 32.) 



Shell small, thin, rounded, rather longer than high, glossy and 

 smooth. Colour white. Faint concentric sculpture. Umbo 

 tumid, prominent. In the left valve, a small posterior and a 

 central arched cardinal with a long thickened anterior limb. In 

 the right, a prominent bifid anterior, and a smaller, simple, pos- 

 terior cardinal. Height, 2*0; length, 2' 2; depth of single valve, 

 06 mm. 



ffab. — 80 fathoms, 22 miles east of Narrabeen, N.S.W. 

 Numerous specimens. 



This is related to Neoleptoii antipodum Filhol,"*'' from New 

 Zealand, which is much larger, more solid, and boldly concen- 

 trically sculptured. 



Erycina helmsi, sp.nov. 

 (Plate Ixxx., figs.37, 38, 39.) 



Shell small, ovate, rather solid and inflated, slightly inequi- 

 valve, inequilateral, produced anteriorly, posteriorly and ven- 

 trally rounded, umbo prominent. Hinge more developed in the 

 right valve, a minute subumbonal cardinal, and a well developed 

 anterior and posterior lateral in each valve The chondrophore is 

 oblique, and is elongate interiorly and posteriorly. Muscle-scars 

 distinct. Colour buff with irregular purple rays which may 

 coalesce to the exclusion of the ground-colour. Length, 2*5; 

 height, 2-1; depth of single valve, 0-8 mm. 



Ilab. — Specimens were taken by the veteran conchologist, to 

 whom the species is dedicated, Mr. Richard Helms,! on the 

 Zostei^a-heds, at Deewhy Lagoon, N.S.W., in association with 



♦Hedley, Trans. N.Z. Inst., xxxviii., 191)6, p. 73, PI. i., fig.5. 

 t Since this was written, Mr. Helms died, July 17th, 1914, in his 72nd 

 year. 



