733 



Poly. 



h, 



JO a. 



vex face of the fish-tooth, partially restored in outline ; J, pro- 

 file section. Belleville, III, from limestone over coal 5 (?) ; a 

 smaller ex. of this species (?) from limestone over coal 8. — 

 XIII-XTf 



Polyrhizodus deutatus, Newberry & Worthen, Geo. Sur. 



111., Vol. 2, 1866, page 60, plate 

 3, figs. 10, 10<^, hind view, and 

 section of a fish-tooth, which 

 has a strong family resemblance 

 to ChoTYiatodus multiplicatuSy 

 and C. loriformis^ through which two it is related to the Bolidi- 

 toothedlPetalodonts ; but its root is divided into distinct radir 

 cles, like P. ponticulus. Chester, 111. Chester limestone (next 

 under the Conglomerate.) — XL 



Polyrhizodus littoni, St. John & Worthen, Geo. Sur. 111., 

 Xf. PLaieib iA-a.. I'^b- ^4-0 Vol. 6,1875, 



^^mm^Mf'W'^^^^mK^ . / "-^^v, page 385, 



( plate 13, 



J figs. 14(2, 5, 



{?, nearly 



perfect fish-tooth, concave and convex faces, ^nd profile sec- 

 tion, to compare with P, williamsi^ St. John & Worthen ; from 

 Alton, 111. St, Louis limestone, XL. 



Polyrhizodus modestus, Newberry, Pal. Ohio, Vol. 2, 1875, 

 P^-^ 10 10 a P^g^ ^^^ plate 58, fig. 10, front face ; 10 ^,pro- 

 ^>>^ file of the only complete little tooth found, 

 M with fragments of others, in tne Cleveland 

 Pc^r 'Ohll.!'' II, ^5s) shale,, Bedford, Cuyahoga Co., evidently dif- 

 ferent from the other species of this genus of fish (McCoy, 

 1848) figured in the Ge®l. Eeports of Illinois, Vol. 2.— F///-X 



Polyrhizodus nanus, St. John & Worthen, Geo. Sur. 111., 



Vol. 6, 1875, page 386, plate 13, figs. 15, a, 



NMW. 



CeolJlL 



r5oL. 



^ 



15 c 



>l. 



.# 



5, convex face and section of little dwarf 

 (nanus) fish-tooth; <?, <5?, enlargements X2, of 

 5i. . VffM. f/.B the same ; unique specimen, although found 

 in a bed abounding in fish-teeth, etc., but its minute size ex- 

 plains the fact. Bentonsport, Iowa; upper part of Keokuk 

 limestone. XL. 



