317 



L. 341. Specimens of both valves in wliich the costoe are much 

 elevated ; from Bairnsdale. Presented hy W. U. Grigson, Esq. 



L. 512. Three examples of the adult ; (locality ?) New Zealand. 

 Presented hy Colonel L. W. Wilmer. 



L. 4815. Example of the neanic stage of growth ; from Muddy 

 Creek. Presented hy John Dennant, Esq. 



L. 9917. Both valves, costae not much imbricated ; from Muddy 

 Creek. Purchased. 



Pecten peroni, Tate. 



1886. Pecten peroni, Tate, Trans. Rny. Soc. South Aust. vol. viii. pi. x. 



figs. \a-b. 

 1893. Pecten peroni (?), Tate and Dennant, id. vol. xvii. pt. 1, p. 224. 



This may readily be distinguished hy its closely-set and fine 

 scaly radiating costa3 ; the primary ribs, with the growth of the 

 shell, become flanked by minor scaly costae, which are very 

 minute at first, but rival in size their accompanying primary rib 

 near the margin, in the adult ; auricula) well developed, unequal ; 

 shell longer than broad. 



Dimensions. — Height 44 mm. ; length 38 mm. 



Form, and Loc. — Eocene : Aldinga, South Australia. 



L. 9914. Example of the adult, both valves. Purchased. 



Pecten consobrinus, Tate. 



1886. Pecten consobrinus, Tate, Trans. Roy. Soc. South Aust. vol. viii. 



p. 104, pi. iii. fig. 6. 

 1893. Pecten consobrinus, Tate and Dennant, id. vol. xvii. pt. 1, p. 224. 



Shell equilateral, slightly convex, the left valve rather flattened ; 

 there are eight primary, radial ridges, and altogether about 100 minor 

 costaj which are unequal in size, the interspaces being minutely 

 granular; the last-mentioned feature is very characteristic. 



The author compares it with P. hifrons, with which it is closely 

 allied. 



Dimensions. — Height 42 ram. ; length 41 mm. 



Form, and Loc. — Miocene : South Australia. 



