315 



Pecten sturtianus, Tate. 



1886. Pecten sturtuinu.i, Tate, Trans. Roy. Soc. South Aust. vol. viii. p. 109, 



pi. vii. figs. 2a-c. 

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

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



Characterized by the regular radiating costse being scaly, the 

 interspaces being transversely or obliquely lineated ; auriculae 

 unequal, the posterior on the left valve being elongately produced, 

 narrow, and deeply excavated by a byssal sinus. 



Dimensions. — Height 17 mm.; length 16 mm. 



Form, and Loc. — Eocene (?) : Victoria. 



L. 340. Two examples; from Bairnsdale. 



Presented hy W. H. Grigson, Esq. 



L. 4814. Left valve ; from Muddy Creek. 



Presented ly John Dennant, Esq. 



Pecten asperrimus, Lamarck. 



1819. Pecten asperrirnus, Lamarck, Hist. Nat. Anim. sans Yert. t. vi. p. 174. 

 1842. Pecten australis, Sowerby, Thes. Conch, vol. i. p. 76, pi. xix. figs. 219, 



220 {non Philippi). 

 1853. Pecten asperrimus, Eeeve, Conch. Icon. vol. viii. pi. xx. fig. 75. 



1885. Pecten asperrimus, E. A. Smith, Voy. " Challenger," Zool. vol. xiii. 



Lamellibranchiata, p. 294. 



In the adult the primary radiating costse are flanked by two 

 or three minor ribs on each side, the small ones being closely 

 scaly, the interstices from summit to summit of the primary costse 

 being broadly V-shaped. 



Dimensions. — Height 83 mm. ; length 78 mm. 



Form, and Loc. — Post-Pliocene : Limestone Creek, Glenelg river, 

 Victoria. 



L. 6567. Examples of the adult, both valves. Purchased. 



Pecten antiaustralis, Tate. 



1882. Pecten aspen-imus, var., Tate, Trans. Roy. Soc. South Aust. vol. iv. 

 p. 34. 



1886. Pecten antiaustralis, Tate, id. vol. viii. p. 106, pi. ix. figs. la-c. 



Distingui.shed by the ornamentation of the costae, each of which 

 consists of a large central rib flanked by one or two small lineations 



