478 MOLLUSCA OP MAST HEAD REEF, QUEENSLAND, I., 



Beneath the coat of sand the valve is flesh-coloured, and con- 

 centrically sculptured. Interior porcellaneous, sometimes white, 

 sometimes orange-buff. Inner margin smooth, bevelled. Pallial 

 line slightly sinuate. Hinge with three cardinals in each valve, 

 the posterior grooved, no laterals. Length 19 mm.; height 17mm.; 

 depth of single valve 6 mm. 



Several separate valves from 17-20 fathoms. 



Macrocallista roseotincta Smith. 

 Gytherea (Callista) roseotincta Smith, Chall. Rep. Zool. xiii. 1885, 

 p. 136, pl.i. figs. 6-66. 

 This species is new to Australia; indeed it appears only to 

 have been taken once, in the Philippine Islands. Numerous 

 dead shells were dredged in 17-20 fathoms around Mast Head. 



Tellina fabrepacta Pilsbry. 

 Pilsbry, Proc. Acad. Nat. Sci. Philad. 1904, p.555,pl.xli.figs.ll-12. 

 On receiving a paper from Dr. Pilsbry on some new Japanese 

 molluscs, I at once recognised the figure of this as one which 

 commonly occurred in 17-20 fathoms off Mast Head. The identi- 

 fication was confirmed by the author of the species, who was 

 surprised to receive his novelty from so remote a locality. 



Abra truncata, n.sp. 

 (Plate xxxviii., fig.34.) 



Shell thin, compressed, a long and narrow wedge, the dorsal 

 and anterior margins forming a right angle, posterior and ventral 

 margins rounded. Colour white. Sculpture: concentric elevate 

 lamellae, wide-spaced and prominent posteriorly, finer and crowded 

 towards the umbo, arrested abruptly on reaching the dorsal area, 

 across which they continue as fine threads. No muscle-scars are 

 perceptible on the glazed interior. The abbreviation of the 

 anterior side has probably contracted the hinge. In the single 

 left valve before me it appears to consist of a medium oblique 

 deeply entering chondrophore and a well developed anterior and 

 posterior lateral. Height 3-6 mm.; length 7 mm.; depth of single 

 valve 1 mm. 



A separate valve from 17-20 fathoms. 



