BY R. ETHERIDGE, JUNE. 531 



Loc. and Horizon. — Stony Creek, Stanwell, near Rockhampton 

 ( 21ie late James Smith, Colin. Geo. Survey Queensland, Bris- 

 l)ane). Gynipie Series. 



Class — -Pelecypoda. 



Order-LUCINACEA. 



Family— ASTARTID^. 



Genus— C Y PRi c A HDE LL A, Hall, 1858. 

 (Trans. Albany Inst., 1858, iv. Pt. 1, p. 17.) 



CyPRICARDELLA RECTANGULARIS, Sp.7lOV. 



(PI. XXXIX. fig. 5.) 



Sp. Char. — Shell small, generally rectangular, short, rather 

 produced antero-ventrally. Hinge line or cardinal margin short, 

 much less than the width of the shell ; ventral margin wide and 

 rounded, graduating into the antero-ventral extremity, which 

 owing to the deep excavation of the anterior margin appears 

 produced ; posterior margin straight, at right angles to the hinge 

 line. Diagonal ridge prominent, but obtusely rounded ; posterior 

 slope flattened, forming almost an equilateral triangle. Surface 

 bearing between thirty and forty regular, close, rounded, concentric 

 ruga?, sharply bent on crossing the posterior slope. 



Obs. — This little shell, referred to Cypricardella purely on 

 external form, is allied to G. bellistriatus, Conrad, sp.,* and is 

 also allied to Cypricardia rhombea, Phill.,t of the British 

 Carboniferous Limestone, which in all probability is a Cypricar- 

 della also. Prof. James Hall J even figures a short variety of 

 Conrad's species, very like the present shell, were it not for the 

 produced anterior end of the latter. Still in this respect it may 

 be compared with G. tewiistriatus, Hall,§ and although the before- 



" Pal. N. York. 1885, v. Pt. 1, No. 2, p. 308, t. 73, f. 21. 



till. Geol. Yorksh., 1836, Pt. 2, p. 209, t. o, f. 10. 



:;: Loc. cit. t. 74, f . 7. 



§ Loc. cit. t. 73, f. 23. 



