264 



there are two interrupted brownish-coloured rays bounding the 

 median area. 



The interior is rose-tinted and the inner edge of the valves 

 along the ventral margin is minutely crenulated. 



Dimensions. — Antero-posterior diameter, 22 ; anterior radius, 

 10-5; posterior radius, 11-5 ; dorso-ventral diameter, 19. 



Habitat. — Dredged in life from nine to fifteen fathoms in 

 Yankalilla Bay, and ofi' Rapid Head by Dr. Verco. 



This species is very like C. aurora and C. Banksii, Adams and 

 Angas, inhabiting Bass-Straits, with regard to colour, ornament 

 and crenated margin of valves. It is, however, of a different 

 form, is as widely removed from C. aurora as that species is from 

 C. Banksii ; thus C. Banksii is oblong-ovate, C. aurora, trans- 

 versely ovate, and C. carnea is more rotund ; they may eventually 

 prove to be variations in shape of an aggregate species. 



The proportion of length to the height in C. carnea is 14 to 12, 

 and in C. aurora, it is 15 to 11. 



PeetuneuluS SOPdiduS, •spec. nov. Plate xi., fig. 8. 



Shell solid, triangularly ovate, moderately convex or slightly 

 depressed, cardinal area short and narrow, somewhat angulated 

 posteriorly, the post-dorsal region impressedly flattened and 

 narrow. 



Surface radiately ridged ; ridges 20, broad, subangulated, not 

 prominently elevated, separated by linear furrows ; there are five 

 faint ribs on the post-dorsal area ; the whole surface crossed by 

 close and fine concentric stria^. 



Colour sordid-white, with a few minute chesnut spots about the 

 umbones, and blotches of the same colour about the hmge-line. 

 Interior white, with a faint chesnut-tinge about the post-adductor 

 impression. Inner margin strongly crenated. 



Dimensions.' — Antero-posterior, 20 ; umbo-ventral, 18 ; sec- 

 tional diameters, 10*5 mm. 



Dredged in life (one example), from 9 to 1 1 fathoms, ofi" Rapid 

 Head, St. Vincent-Gulf (Dr. Verco). 



It has not the shape of P. Gealei of tlie same size, but the 

 general style of ornament is the same; though the ribs of the 

 present shell are more depressed and angular, there is no defined 

 interstitial furrow, and the concentric ornament is finer. 



Leda VereoniS, -^pec. nov. Plate xi., fig. 4. 



Shell elongate-ovate, moderately compressed, subequilateral ; 

 concentrically lirate ; covered Avith a greenish - gray glossy 

 epidermis. 



The dorsal margins are equally sloping, the front one a little 

 convex, the posterior slightly concave ; the posterior side is 



