308 SPONDTLUS. 



smaller ralve), -nfo-; greatest widtli, -nro; depth of larger ralve, 

 "A-Q-; depth of small valve very variable." — M^Cmj. 



The specific characters and dimensions are taken from Sir F. 

 M'Coy's description, as none of the specimens in the Museum 

 collection are perfect, except two very small examples, which are 

 not characteristic. 



Form, and Loc. — Eocene : "Victoria and South Australia. 



L. 357. Eight valve, costse small, but principal ones bearing 

 very long spines; from Bairnsdale. Presented ly W. H. Grigson, Esq. 



L. 6586. Examples of both valves of the neanic stage of 

 growth ; from Muddy Creek. Purchased. 



L. 10600. Imperfect right valve, of large dimensions ; from 

 Willunga, JS. T. L. Brown Coll. 



Spondylus pseudoradula, M'Coy. 



1877. Spondylus pseudoradula, M'Coy, Prod. Pal. Yict. dec. v. p. 17, 



pi. xlv. fig. 2. 

 1886. Spondylus pseudoradula, Tate, Trans. Roy. Soc. South Aust. vol. viii. 



p. 121. 

 1893. Spondylus pseudoradula, Tate and Dennant, id. vol. xvii. pt. 1, p. 224. 



Shell thinner than S. gcederopoides, from which it may readily 

 be distinguished in being less ventricose, and by the small spinose 

 and granose ridges between the major spinose costfe, which are 

 much reduced in size in many individuals ; the auricles are nearly 

 equal and are relatively larger than in that species. 



Dimensions. — Height 39 mm. ; length 35 mm. 



Form, and Loc. — Eocene : Muddy Creek, Victoria. 



L. 4816. Three examples of the left valve. 



Presented ly John Dennant, Esq. 



L. 9837. Examples of both valves, showing extreme variation 

 in regard to external ornament. Purchased. 



Spondylus, sp. 



L. 10601. Internal cast of a species allied to S. pseudoradula; 

 from the Tertiary of NuUarbor Plains, South Australia. 



JI. Y. L. Brown Coll. 



