Maryland Geological Survey G69 



Occurrence. — I i:\NiX(is Fok.mation, I'aukukad Member. Williams 

 l?oa(1, on Polish ]\I()Uiitain, KHiO; 2VL> miles above mouth of Sideling 

 Hill Creek. 



Collection. — IMarvland (Jeological Survey. 



Genus PHANEROTINUS Sowerby 



Phanerotinus laxus (Hall) 



Plate LXVII, Fig. 26 



Eiiomphalus laxus Hall, 1861, Descriptions of New Fossils, p. 2(i. 

 Euomphalus laxus Hall, 1862, 15th Rept. N. Y. State Cab. Nat. Hist., p. 54, 



pi. vi, flg. 2. 

 Euomphalus {Ecculiomphalus ?) laxus Hall, 18TG, Illustrations Devonian 



Foss. Gastropoda, pi. xvi. 

 Ecculiomphalus comes Hall, 1879, Ibid. pi. xvi. 

 • Euomphalus laxus Hall, 1879, Pal. of N. Y., vol. v, pt. ii, p. 60, pi. xvi, figs. 



8, 9, 16-18. 

 Phanerotinus laxus Grabaii and Shimer, 1909, Index Foss. N. Amer, vol. i, 



p. 656, fig. 901. 



Descrijifion. — "Shell discoid; lower side limadly iimbilieate. Volu- 

 tions aljout four, nearly in the same plane, the inner ones rising moder- 

 ately above the plane of the outer one, disjoined th.roughout their entire 

 extent, very gradually and regularly e.xpanding from the apex; section 

 circular. Aperture (so far as known) subcircular. scarcely expanded. 

 Surface marked by crowded concentric stria', which are sometimes regu- 

 lar and ecpial. and on some parts of the shell more closely arranged, and 

 all directed a little forward, from the inner side of tlie voluti(Ui."' Hall, 

 1879. 



Diameter 25 mm. ; diameter of vohition at aperture 7 mm. 



A single specimen of this species has been observed in the Parkhead of 

 Maryland. 



Occurrence. — Jennings Formation, Parkhead Member. Two and 

 a half miles above month of Sideling Hill Creek. 



Collection. — IMarvland Geological Survev. 



