364 UECORDS OF Tllh: AUSTRALIAN MUSEUM. 



TURQUETIA INTEGRA, sp. nov. 



(Plate Ixvi., fig. 7, 8, 9, 10). 



Shell small, moderately solid, rather inflated, nearly ei[uilateral, 

 oblong, higher behind than before, dorsal margin straight, anterior 

 and posterior rounded, ventral slightly sinuated. Colour cream. 

 Umbo inflated, prominent. A slight shallow median sulcus exter 

 nally. Sculpture : fine irregular incremental lines. Hinge, a 

 narrow external ligament, no laterals, a tubercular subumbonal 

 cardinal and socket in each valve Pallial line entire. Height, 

 3-5, length, 6 ; deptli of single valve I'O mm. 



A few separate valves were taken in 800 fathoms. My figure 

 and description is based on a better example dredged in 250 

 fathoms, twenty-three miles east of Sydney by Mr. Petterd and 

 myself. 



The generic allocation of this species has been a matter of 

 difliculty to me, and I have taken refuge, though not with feelings 

 of security, in Turquetia. This at least corresponds to the extent 

 of having a simple pallial line, no laterals and one cardinal in each 

 valve. Our species is larger and has not the short truncate pos- 

 terior side of the type. Turquetia was proposed by Velain'^^ for a 

 small bivalve from St. Paul Island in the Indian Ocean. Its 

 hinge was more fully explained by Bernard'-'. 



2!» Velain— Archiv. Zool. Expcv., vi., 1877, p. 134, pi. v., f. 15-17. 

 23 Bernard— Bull. Mus. Hist. Nat., iv., 1898, p. 84, f. 6. 



