33 
Deltopecten, sp. 
(Plate IX, Pig. 12') 
Observations . — Por the purpose of future identification we figure an 
internal cast that we are unable to place in any of the foregoing species of 
the genus. 
The valve was moderately convex, with a short cardinal margin, a 
fairly wide hinge-plate, hearing coarse resilium furrows and a deltoid chondro- 
phore. The cast of the umho is pointed and narrow, hut does not overtop the 
cardinal margin. The auricles are imperfect, but one is certainly flat and 
rectangular. No trace of external sculpture remains, hut there is clear 
evidence of at least three widely-spaced llattened latilamina?. 
"We regret we are unable to identify this cast, for geologically speaking, 
it is of imjiortance as the only Peetinoid shell yet met with in the Tokal 
Conglomerate. 
Locality and Horizon. — Tokal, Paterson {T. W. E. David). — Permo- 
Carboniferous- Lower Marine Series. 
Collection . — Mining and Geological Museum. 
PECTINID.®. 
ENTOLIUM, Meek, 1805. 
Untoliun} , Mo(‘k, Progress Pie])ort (leol. Survey California, ISfi.o, T, App. I?, p. 47S (Aineiieau 
Mesozoic type K. av rarlum, Me(“ki). 
,, Meek, Hayden’s Pinal Jlejjoi't U. S. Ceol. Surv(*y Nebraska, Pt. 2, 1S72, p. 
(American I’.aheozoic type —Veclen avicnlidus, Swallow-). 
Observations . — The late Prof. .Tames Hail believed Entolium to be in 
great part a synonym of Pernopecten, Winehell, but the relation of the two 
genera is an intricate one, and the explanation olfered^by the great American 
' The actual ft/ps sdected by Meek for his subgenus Entolium was liie European Jurassic Pecten deiniiisux, 
Phill. The general question is, unfortunately, still further eouiplicateJ by Prof. A. E. Vcrrill seleel ing this shell 
as the type of his genus Protamussium. (Tran?. Connecticut Acad. Arl.s and Sei., 1899, X, Pt. 1, p. 71). He appears 
to have overlooked Meek’s previous selection. 
^ European Palajozoic type is Pecten Sowerlyi, McCoy. 
’ Hall. — Pal. N. York, 1885, V, Pt. 2, p. Ivii. 
