Mono. 



418 



5, fig. 1, cast left by the dissolution of the fossil ; fig. 2, plaster 

 cast of the hole in fig. 1. Fig. 3, a smaller specimen. Fig. 4, 

 a section through the tube of a third specimen. Traces of ten- 

 tacles discernible around the upper edge of the funnel in both 

 specimens. (Figs, natural size.) Found by Ellis Clark, Jr., 

 \ mile northwest of Helfrick's spring, in the bed of Jordan 

 creek, Lehigh county, Pa. Recognized by Dr. Otto Torrell, 

 director of the Geol. Survey of Sweden, as a species of his 

 genus Monocraterion found in a sandstone at Lugnas, W. 

 Gothland, in Cambrian (Harlech or Longmynd) rocks, below 

 the Paradoxides hicksii beds. — (See Acta Univer. Lund. 1869 

 Pet. Suec. Form. Camb. page 13.) — Probably low in Calcifer- 

 ous limestone formation. // a. Found again in 1887 by W. 

 Charles Laubach of Riegelsville, Bucks Co., Pa., in a limestone 

 quarry, three-quarters of a mile northwest of Durham Iron 

 Works ; many specimens. — They are probably worm-burrows 

 made by some animal quite different from the worm which 

 made Scolithus linearis. 



Monomerella newberryi, H. & W. See Appendix. 



Monopteria gibbosa. {Pterineagibhosa^Meek&Woi^ihen.) 



Proc' Chicago A. N. S., 1866, p. 

 20, Illinois Report 1866, Vol. 2, 

 page 340, plate 27, fig. 11) Col- 

 lett's Indiana Rt. 1883, page 

 139, plate 30, figs. 11, 12, natu- 

 ral size., outside and front views 

 of two separate right valves. — 

 XIII. Coal Measures of Galla- 



One very plain example found by Heil- 



prin among the Mill 

 creek limestone speci- 

 mens in Mus. Wj^om- 

 ing Historical Soc. at 

 Wilkesbarre, Pa. — 

 XIII, 1000' up in the 

 Anthracite Coal Meas- 

 itA MONOPTERrA GIBBOSA* ures. See Geol. Pa. 

 An. Kt., Ib85, p. 444, 445, figs. 11, 11 a. 

 Closely allied to M. auricula, Stevens, 



I2i 



ton county, Illinois.— 



n MONOPTERIA GIBBO!J'\. 



