814 



Chlamys was proposed for a genus of Coleoptera in 1801, and 

 cannot therefore be used for the mollusc. 



There is no absolute synonym of Chlamys that could be employed, 

 but the writer is not inclined to suggest a new term, believing that 

 by a greater breadth of treatment than is now in vogue, one of the 

 numerous sectional names already in existence will ultimately 

 be applied to those Pectinid^ that have hitherto been called 

 Chlamys. The Australian forms here alluded to are therefore 

 retained in Pecten, for the present. 



Type. — Ostrea maxima, Linnaeus. 



Pecten murrayanus, Tate. 



1886. Fecten murrayanus, Tate, Trans. Eoy. Soc. South Aust. vol. viii. p. 105, 



pi. vii. figs. 5«-5. 

 1889. Pecten murrayanus, Dennant, id. vol. xi. p. 49. 

 1893. Pecten murrayensis, Tate and Dennant, id. vol. svii. pt. 1, p. 224. 



Shell orbicular, one valve convex, the other flat ; radiating 

 costse from twenty to twenty-four in number, rounded, prominent, 

 crossed by conspicuous, regular, closely-set, undulating lineations 

 which are approximately coincident with the margin ; interior 

 ridged and furrowed, corresponding with the main features of the 

 external ornament; auriculae well developed, unequal in size, rayed 

 and vertically striated on the exterior. 



It may be distinguished from P. solarium, Lamarck, of the 

 European Tertiary, by the Australian fossil having fewer costse, 

 and smaller auriculse. 



Dimejisions. — Height 51 mm. ; length 55 mm. 



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



L. 4812. Several examples of both valves ; from Muddy Creek. 



Presented by John Pennant, JEsq. 



L. 6578, L. 9916. Many specimens of the adult, both valves ; 

 from Muddy Creek. Purchased. 



L. 10531, L. 10532. Examples of both valves ; from Fowler's 

 Bay District. H. T. L. Brown Coll. 



L. 10548. Flat valve ; from the River Murray cliffs, near 

 Adelaide. Presented ly William Fvans, Esq. 



L. 10549. Imperfect flat valves ; from NuUarbor Plains. 



S. Y. L. Brown Coll. 



