PERMO-CARBONIFEROUS PELECYPODA— ETHERIDGE. 181 



(Compare Cypricardia(Avicida?) veneris, Dana, loc. cit., pi. 9, f. 3, 

 3a and b.) 



Sp. Char. — Shell more or less compressed pod- or filbert-shaped, 

 very inequilateral ; dorsal and ventral margins almost parallel, 

 the former straight, and the latter but little curved, with a slight 

 inflection at about its antei'ior third ; no diagonal ridges, but the 

 valves uniformly and very slightly convex throughout, except for 

 shallow cinctures running obliquely from the umbones posteriorly 

 to the ventral margins ; umbones inconspicuous, depressed. 

 Anterior ends very small, slightly protruding, the margins rounded; 

 posterior ends compressed, the margins obliquely rounded above 

 and below. Ligamental fulcra large, leaving deep impressions in 

 casts ; ligamental (?) pits transversely elongated, inclined to tri- 

 angular, represented in casts by sharp crests. Anterior adductor 

 impressions very large, rather deltoid, concentrically grooved, the 

 thickened posterior edges leaving wide groove-like depressions in 

 casts, which extend to immediately in front of the umbones. Six- 

 teen to twenty radiating costas proceed from the umbones to the 

 posterior margins commencing just behind the shallow oblique 

 cinctures, with the whole surface crossed by close concentric tine 

 lines, which imbricate the cost?e. 



Obs. — As this was the first species described by Morris, it must 

 be regarded as the type. His fig. 1, of the»4'eference quoted above, 

 gives a faithful and accurate representation of the shell, and it 

 will be observed that the radiating cost?e are there visible on the 

 cast, the test having broken away along the hinge line in both 

 valves. Fig. 2 is an equally good illustration, but on this, although 

 again a cast, the costa? are not visible at all. In DeKoninck's 

 figure of this species the umbones are too acute and projecting, as 

 they do not in reality overhang the anterior ends. 



There appears to be every probability of Dana's Cypricardia 

 ( Avicula ?) veneris being nothing more than a small individual 

 of this species. 



Loc. and Nor. — Jamberoo, Black Head, and Crooked River, 

 near Gerringong, Illawarra District — Upper Marine Series. 



Stutchburia compressa, Morris, sp. 



(PI. xxxi., fig. 2, and xxxiii., fig. 1.) 



Orthonotal costaia, Morris, loc. cit., pi. 11, fig. 2, (non f. 1) 

 Orthonotal compressa, Morris, loc. cit., p. 274, pi. 13, f. 4. 

 Orthonota compressa, Eth. fil., loc, cit., p. 74. 



Obs. — The specific value of this form mainly depends on the 

 presumed absence of the posterior radiate sculpture, but as this is 

 seen on one of Morris' types of S. costata, and not on the other, it 

 may be taken as a specific character, I have therefore included 

 the figure without the posterior radii as a synonym of S. compressa, 



