EDE. FIS.] 



PISCES. 



597 



nitidus, Cope, 1880, Pal. Bull. No. 32, p. 



19, Permian. 



EDESTUS, Leidy, 1856, Jour. Acad. Nat. Sci., 

 2d ser., vol. 3, p. 159. [Ety. edestes, a 

 devourer.] Maxillary bone segmented ; 

 segments beveled anteriorly and exca- 

 vated posteriorly for co-adaptation; 

 teeth resembling tbose of Carcharodon, 

 one co-ossified with each maxillary seg- 

 ment. Type E. vorax. 



giganteus, Newberry, 1888, Ann. N. Y. 

 Acad. Sci., vol. 4, p. 1, Coal Meas. 



heinrichsi, Newberry & Worthen, 1870, 

 Geo. Sur. 111., vol. 4, p. 350, Coal Meas. 



minor, Newberry. 1866, Geo. Sur. 111., 

 vol. 2, p. 84, Coal Meas. 



vorax, Leidy, 1856, Jour. Acad. Nat. Sci. 

 Phil., vol. 3, 2d series, p. 159, Coal 

 Meas. 



FIG. 1129. Edestus vorax. 



Elonichthys peltigerus, see Palaeoniscus pelti- 

 gerus. 



ERISMACANTHUS, McCoy, 1848, Ann. and 

 Mag. Nat. Hist., 2d series, vol. 2, p. 119. 

 [Ety. ereisma, a prop or stay ; akantha, 

 spine.] Spine of three parts ; one com- 

 pressed, finely striated, which entered 

 the flesh ; the second short, compressed, 

 rapidly tapering, curved backward, 

 sides with longitudinal ridges, and two 

 rows of downward curved teeth on the 

 posterior concave margin ; the third, a 

 prop-like part extending forward nearly 

 at right angles with: the base, arched, 

 compressed at the basal half, depressed 

 distally, and covered with tubercles 

 and some spines on the under side. 

 Type E. jonesi. 



maccoyanus, St. John & Worthen, 1875, 

 Geo. Sur. 111., vol. 6, p. 461, St. Louis Gr. 



EUNEMACANTHUS, St. John & Worthen, 1883, 

 Geo. Sur. 111., vol. 7, p. 120. [Ety. eu, 

 beautiful ; nema, a line ; akantha, spine.] 

 Distinguished from Ctenacanthus by 

 the plain dorsal ridge, tuberculated in- 

 tercostal sulci, and upward direction of 

 the denticles on the angles of the pos- 

 terior face. Type E. costatus. 

 costatus, Newberry & Worthen, 1866, 

 (Ctenacanthus costatus,) Geo. Sur. 111., 

 vol. 2, p. 120, St. Louis Gr. 



ECRYLEPIS, Newberry, 1856, Proc. Acad. 

 Nat. Sci. Phil. [Ety. eurys, broad ; lepis, 



scale.] Small ; body fusiform ; head 

 obtuse; tail elongated, lobes unequal; 

 fins small, with delicate fulcra; dorsal 

 and anal fins opposite, and far back on 

 the body ; yentrals near middle of abdo- 

 men ; cranial surface tubercular ; max- 

 illary, mandibular, and jugular plates 

 corrugated ; scales smooth, ornamented, 

 or serrated; teeth numerous, conical, 

 short. Type E. tuberculata. 

 corrugata, Newberry, 1856, Proc. Acad. 

 Nat. Sci. Phil., and Ohio Pal., vol. 1, p. 



350, Coal Meas. 



granulata, Newberry, 1856, Proc. Acad. 



Nat. Sci. Phil., and Ohio Pal., vol. 1, p. 



352, Coal Meas. 

 insculpta, Newberry, 1856, Proc. Acad. 



Nat. Sci. Phil., and Ohio Pal., vol. 1, p. 



351, Coal Meas. 



lineata, Newberry, 1856, 



Proc. Acad. Nat. Sci. 



Phil., and Ohio Pal., 



vol. 1, p. 353, Coal 



Meas. 

 minima, Newberry, 1873, 



Ohio Pal., vol. 1, p. 353, 



Coal Meas. 

 ornatissima, Newberry, 



1856, Proc. Acad. Nat. 



Sci. Phil., and Ohio Pal., 



vol. 1, p. 352, Coal Meas. 

 ovoidea, Newberry, 1856, 



Proc. Acad. Nat. Sci. 



Phil., and Ohio Pal., vol. 



1, p. 351, Coal Meas. 

 striolata, Newberry, 1873, 

 Ohio Pal., vol. 1, p. 355, Coal Meas. 

 tuberculata, Newberry, 1856, Proc. Acad. 

 Nat. Sci., and Ohio Pal., vol. 1, p. 350, 

 Coal Meas. 



FIG. 1130. Eurylepis tuberculata. 



EUSTHENOPTERON, Whiteaves, 1881, Am. 

 Jour. Sci. and Arts, 3d ser., vol. 21, p. 

 495. [Ety. eu, very; sthenes, stout; 

 pteron, a fin.] Fin rays of anal and 

 second dorsal fins supported by three 

 osselets articulated to a broad inter- 

 spinous apophysis ; vertebral centers 

 not ossified ; caudal osselets articulated 

 to modified heemal spines. Type E. 

 foordi. 



foordi, Whiteaves, 1881, Am. Jour. Sci. 

 and Arts, 3d ser., vol. 21, p. 495, Upper 

 Devonian. 



FISSODUS, St. John & Worthen, 1875, Geo. 

 Sur. 111., vol. 6, p. 413. [Ety. ftssus, 

 split ; odous, tooth.] Teeth small, in 

 the form of root and general contour 



