( .)78 PELECYPODA. [Eulamtllibramhia. 



sometimes bluish. Interior white, porcellanous, with a few faint 

 radial plications at the pallial line. Margins smooth, thick, and 

 blunt. Hinge-plate strong and broad ; right valve with 4 cardinals, 

 the anterior oblique, short and thick, directed forwards ; the second 

 very stout, triangular, subvertical ; the third very oblique, long, 

 grooved above ; and the fourth parallel to the latter, consisting of a 

 low and long lamella ; the 2 anterior lateral teeth distinct, short, 

 the anterior connected with the anterior cardinal ; left valve with 

 3 cardinals, the 2 anterior teeth diverging, connected above, A -shaped ; 

 the posterior cardinal on the dorsal margin, long and sharp ; the 

 anterior lateral reduced to a stout tubercle. Ligament deep-seated 

 between the valves, extending from the beaks to the end of the hinge- 

 plate ; the resilium well developed. Adductor-scars subequal, ovate, 

 the anterior deeper. Pallial line very distinct, far removed from the 

 margin ; the pallial sinus deep, ascending, narrowly triangular, its 

 apex narrowly rounded, pointing towards the middle of the anterior 

 scar and extending a little beyond the middle of the disc. 



Length, 61 mm. ; height, 55 mm. ; diameter, 32 mm. Length, 

 52 mm. ; height, 48 mm., diameter, 31 mm. (New Zealand specimen). 



Type in the British Museum. 



Hah. Lyall Bay ; Nelson. 



The type is from Torres Strait, and the species is also recorded 

 from Victoria. 



Sect. 3. AUSTRODOSINIA, Ball, 1902. 



Type : Cytherea anus, Philippi. 



Lunule deeply impressed ; escutcheon impressed and bordered by 

 prominent keels ; pallial sinus short and angular ; anterior cardinals, 

 and especially the anterior lateral, with the pit into which it is received 

 sharply corrugated. 



New Zealand and Japan. 



KEY TO SPECIES. 



A. Shell rather coarsely concentrically ribbed ; pallial sinus pointing 



below the anterior adductor-scar . . . . . . . . anus. 



B. Shell with finer and closer concentric sculpture ; pallial sinus 



pointing at the middle of the anterior adductor-scar . . subrosea. 



3. Dosinia anus, Philippi, 1848. Plate 60, fig. 9. 



Cytherea amis, Phil., Zeitschr. f. Malac., 1848, 132. Artemis anus, Phil.. 

 Couch. Icon., vi, 1850, f. 10; Thes. Conch., ii, 1852, 674, pi. 144, f. S2 : 

 Crit. List, 44 ; Hutton, J. de Conch., xxvi, 48. Dosinia anus, Phil. : 

 Romer, Nov. Conch., Dosinia, 1862, 29, pi. 5, f. 4 ; C.M.M., 71. Artemis 

 nstralis, Q. & G. : Gray, Dieff. KZ., 1843, 24!), not of Quoy and Gaimard ; 

 M.N.Z.M., 150. Dosinia mistralis, Gray: Hutton, P.L.S. N.S.W., ix, 

 523 ; Index, 89. 



Shell subquadrate - orbicular, solid, compressed, concentrically 

 sharply ribbed and laminated, very light brown, inequilateral. Beak* 

 rather prominent, acute, situate at about the anterior fourth, curved 



