108 



Localities. — Chalk rock o£ the Bunda Cliffs, G-reat Aus- 

 tralian Bight ; Polyzoal rock, Aldinga Bay ; at mouth of the 

 River Onkaparinga ; and at Surveyor's Point, Yorke Peninsula 

 {R.T.). 



The species may appropriately be named in honour of Sir 

 John Eyre, from the circumstance of its occurrence at Wilson 

 Bluff, G-reat Australian Bight, whose graphic description of an 

 attempt to scale this bold headland must be familiar to those 

 who have read the narrative of his adventurous overland 

 journey to Perth. 



Pecten Flindersi, spec. nov. Plate viii., fig. 7. 

 Shell obovate to triangular, orbicular, equilateral, or slightly 

 inequilateral, equivalve moderately convex, umbos depressed, 

 acute, ornamented with from 35 to 40 flatly rounded ribs with 

 broader interspaces. The ribs are smooth or surmounted by 

 distant minute scales ; the interspaces are marked with per- 

 pendicular engraved lines. 

 Ears as in P. Eijrei. 

 Dimensions. — Millimetres. 



Length. Height. Thickness. No. ribs. 



54 dQ 23 35 



51 54 — 40 



43 50 — 30 



35 37 11 37 



77 80 38 40 



60 — 15 50 



Localities. — Griauconite limestone, Aldinga Bay; glauconite 

 sands, Adelaide bore ; clays at Muloowurtie, Yorke Peninsula. 

 F. Flindersi has a general resemblance to F. ricdis, Gr. B. 

 Sowerby in Darwin's G-eol. Observ., of the Chilian Tertiary, 

 but that shell has fewer ribs with narrower interspaces. 



Species-name in commemoration of Captain Flinders, the 

 intrepid Australian navigator. 



Pecten Peroni, spec. nov. Plate x., figs, la — 16. 



Shell ovate-orbicular, equilateral, equivalve, nearly flat, 

 umbos acute, depressed, ornamented with numerous acute or 

 subacute scaly ribs flanked on each side by a scaly riblet ; 

 interspaces very shallow, a little wider than the ribs, minutely 

 granular. The primary ribs vary from about 35 to 40, and with 

 the riblets are covered by crescentic scales or short triangular 

 spines. Ears as in F. Fi/rei, but the posterior ones with the 

 dorsal margin usually serrately fringed. 



Dimensions. — Length, 39 ; height, 42 ; thickness through 

 both valves, 11 millimetres. 



Localities. — Polyzoal limestone, Aldinga Bay ; Adelaide 

 bore. 



