26 



RECORDS OF THE AUSTRALIAN MCJSEUM. 



strip descending from the umbo. The thin epidermis is puckered 

 into raised threads, coarser posteriorly, which sometimes follow 

 and sometimes obliquely cross the main sculpture. Where unworn 



Fig. 7. 



the surface seems minutely granular. The chondrophore is small, 

 shallow, and directed downwards. Length, 15 5 mm.; height 

 11 "2 mm. 



The species is based on a single, rather worn, right valve, 

 labelled by Mr. J. Brazier "five miles east of Sydney Heads, 

 seventy-five fathoms." The depth should, I think, be forty-tive 

 fathoms. From that locality Mr. Brazier received a quantity 

 of shells, including Cassis tkomsoni,*'' on June 3rd, 1874, when 

 a party of Sydney naturalists was entertained on board " H.M.S. 

 Challenger." I suppose that the specimen I describe was then 

 obtained. 



Sarepta? tellinaeformis, n. sp. 

 (Fig. 8). 



Shell equilateral, oval, tumid, thin and translucent ; ventral 

 margin more rounded than the dorsal, posterior end more produced 

 than the anterior. Substance at first sight dull and porcellanous, 

 but on close examination showing occasional pearly lustre. Umbo 

 prominent, neither lunule nor area. Colour dull white. No 

 radiating sculpture, but closely, evenly, and entirely covered with 

 fine concentric hair lines. Ventral margin smooth. Hinge plate 

 slightly arched, interrupted by a broad, shallow, projecting, oblique 

 chondrophore. On the shorter, anterior portion, are about fifteen, 

 and on the posterior about eighteen small teeth ; the proximal 

 lamellate, the distal forked Above the margin, below the umbo, 

 and communicating with the chondrophore is a small hemispherical 

 ligament pit. Muscular scars faint, pallial line entire. Length, 

 9-5 mm.; height, 7 5 mm. 



" Brazier— Proc. Linn. Soc. N.S.W., i., 1875, p. 9. 



