263 



Dimensions. — Antero-posterior, 15-5 ; umbo-ventral, 12; sec- 

 tional diameters, 5-25 mm. 



Locality. — St, Yincent-Gulf, in 17 to 18 fathoms {Dr. Verco). 



This species is related to T. lanynida, E. A. Smith, but it has 

 a lamelliform and not striated ornament. Mr. Brazier reports to 

 me that "the species is quite new; it is smaller, and allied to 

 T. margaritina, Lamarck, from King George Sound; it is a great 

 deal smaller, and in miniature like T. ostracea, Lamarck, from 

 India." The dentition of T. Viyicentiana will not justify its 

 inclusion in the subgenus FahuJina, to which Yon Bertin refers 

 T. aitstralis, Desh., and T. maryaritina, Lamarck. 



LueinopsiS pellueida, ■'<i:>ec. nor. Plate xl., fig. 2. 



The shell, the diagnostic characters of which here follows, has 

 an external resemblance to Kellia rotunda and Diplodonta globu- 

 lar is, more especially to the latter by reason of the external liga- 

 ment. But the internal characters are proper to Lucinopsis, as 

 determined by actual comparison with its type-species, L. undata. 



The left valve has three cardinal teeth ; the central tooth is 

 vertical, triangular, and its summit medially excavated, appearing 

 as if bifid ; the anterior tooth is lamellar, short, and moderately 

 divergent; the posterior tooth is longer, lamellar, and widely 

 divergent ; the anterior cardinal margin has a deep and wide 

 groove. 



The right valve has two divergent lamellar teeth, and the 

 cardinal margin in front is furrowed. 



The pallial sinus is large, rounded, and ascending, reaching to 

 the middle line of the valve. 



Shell rather globose, somewhat circular, and nearly equilateral ; 

 it is whitish, slightly glossy, and translucent, ornamented with 

 tine concentric lines and folds of growth, and with delicate radial 

 stride on the posterior area. 



Dimensions. — Antero-posterior, 12-5 ; umbo-ventral, 12 ; sec- 

 tional diameters. 7"5. 



Dredged in life (two examples) from 12 fathoms in Yankalilla 

 Bay, St. Yin cent-Gulf (Dr. Verco). 



Crassatella earnea, -^pec nor. Plate xi., figs, i, la. 



Shell suborbicular, rather compressed, almost equilateral ; the 

 dor'^al margin about equally sloping on both sides, a little arched 

 in front, but ratlier straighter beliind ; anterior side rounded, 

 post-ventral margin slightly obliquely truncated (more conspicu- 

 ously so in young examples) ; ventral inargin moderately curved. 



Surface concentrically ribbed, the ribs attenuate laterally, and 

 may or may not be developed to th(3 ventral margin. 



The colour is a pale yellow-brown with darker coloured blotches 

 in the median area and before and behind the umbos ; sometimes 



