429 



MURC. 



XIII. 



Da/y 



Illh.—See specimens (three) 210-47 (00, p. 232) of doubtful 



species, much worn and unsatisfactory, in Fellows' collections 



at Bellefonte. Trenton limestone^ lie, 

 Murchisonia gypsea, Dawson. Acad. GeoL, 1868, p. 310, 

 _^^^23 fig. 123, a cast of a shell like, but larger than, M, 

 ^^""A nana^ De Kon. and with only two revolving ridges 



on the whorls. Carl, lime, of Windsor, N. 8.— XI? 



Murchisonia insculpta. (Hall, Trans. Alb. Inst., Vol. 4, 

 1856.— Whitfield, Bull. 3, Am. Mus. Nat. Hist., 

 N. Y., 1882, page 85, plate 9, fig. 18). Collett's 

 Indiana Rt., 1882, page 359, plate 32, fig. 18, 

 Iw^ Jj? '^^9'^^^^^foy^Ttimes. 'Resembles Murch, (Pleu- 

 rotomaria) conula^ with some difi'erences. In 

 some specimens with single volutions, the strong nodes are the 

 characteristic feature. Some show cross striae. — Subcar- 

 honiferous. SpergenHill, &c.,Ind. X/.— Note. All these Sper- 

 gen Hill forms were drawn and described in the Museum of the 

 Central Park at New York, and although copied from the Indi- 

 ana report, should be credited to the Museum. (Whitfield's 

 MS. letter, Jan., 1889.) 

 Murchisonia leda, Hall. 14th An. Kt., N. Y., 1861, p. 103 ; 



15th An. Kt., 1862, plate 4, fig. lO^—JJp^er 

 Helderherg formation^ YIIIc. 



Murchisonia linearis, Billings. Can. Nat. and Geol., Vol. 



'//d. Murchisonia linearis (BillinpTs) 4, 1859, Calciferous Sandstone 



formation. GeoL Canada, 1863, 



Geof.Cdn. 



3 J, page 119, fig. 31. — II a, 

 Murchisonia macrospira, Hall. Pal New York, Vol. 



macrospira (Hall). 



GboJCsh 



/ass 



2, 1852, p. 346, pi. 

 83, f. 5. QuelpTi for- 

 mation. Geology of 

 Canada, 1863, p. 339 

 fig. 344.— Vl\ — 

 Hall's fig. is a mould 

 of 4 whorls, with 

 strong keel and a 

 canal on the last. 



