104 CARBONIFEROUS AMMONOIDS OF AMERICA. 



Occurrence. — Paralegoceras netvsomi was found in the Lower Coal 

 Measures near Morrillton, Conway County, Ark., T. 5 N., R. 16 W., sec. 

 14, on the Arkansas River. Specific name in honor of the discoverer, J. F. 

 Newsoni. The type specimen is deposited in the geologic collection of the 

 Leland Stanford Junior University. 



Paralegoceras texanum Shumard. 

 1863. Goniatites texanus, B. F. Shumard, Trans. St. Louis Acad. Sci., Vol. II, p. 109. 

 The following description is quoted from Shumard's paper: 



Shell large, discoidal, strongly rounded on the dorsum [abdomen], gently convex 

 on the sides, umbilicus deeply excavated, exhibiting the inner volutions, and having 

 a diameter equal to two-thirds the greatest width of the last volution; margin 

 subangulated; transverse section of last volution semielliptical; its dorso-ventral 

 diameter about equal to, or a little greater than, the width from side to side. 



A small fragment only of the shell is preserved in one of the specimens in the 

 Texas State collection. It is extremely thin, and the surface is marked with numer- 

 ous parallel revolving lines, crossed with llexuous transverse lines, presenting a neat 

 cancellated appearance. There are also faint indications of transverse costaj 

 perceptible near the margin of the umbilicus. xSV/ite deeplj' sinuous; dorsal 

 [ventral] lobe cleft by a profound linguteform sinus with a broad base, into two 

 narrow, elongated branches, which are not so wide as the sinus between, and which 

 are gently expanded in the middle and narrowed to an acute point at their 

 extremities by an oblique truncature of their inner margins; dorsal [ventral] saddle 

 lingureform, longer than wide and larger than the branches of the dorsal [ventral] 

 lot)e; superior lateral lobe having nearly the same form as the branches of the 

 lateral lobe, but larger. 



This description places it beyond doubt that the species is a Paralego- 

 ceras, but as it was never figured, and the type is lost, it is difficult to say 

 whether P. texanum is equivalent to any of the other species of this genus. 

 It may be the same as P. iowense Meek and Worthen. 



Occurrence. — Lower Carboniferous, St. Louis-Chester stage, Bend for- 

 mation, Wallace Creek, San Saba County, Tex. 



Genus ScHiSTOCERAS Hyatt. 

 Type of genus, Schistocerati hyatti Smith. 

 The genus Schistoceras was established by Hyatt " to include — 



a single species which is not figured or described, but can be readily distinguished 

 by its large bottle-shaped, sipbonal saddle. This is the onh' characteristic by which 



"Proc. Boston Soc. Nat. Hiat., Vol. XXII, p. 336. 



