598 



PISCES. 



[GIS. — HAR. 



like Peltodus, but distinguished by the 

 cleft condition of the crest. Type F. 

 bifidus. 

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

 Sur. 111., vol. 6, p. 414, 

 Kaskaskia Gr. 

 tricuspidatus, St. John & 

 Worthen, 1875, Geo. Sur. 

 fig. usi.-Fta- Jfi vol 6, p. 415, Kaskas- 

 sodus bi- kia Gr. 

 fldus. Gampsacanthus, St. John & 



Worthen, 1875, Geo. Sur. 111., vol. 6, p. 

 471. [Ety. .gampsos, curved; akantha, 

 spine.] Spines long, laterally com- 

 pressed, tapering, costate, with larger 

 and smaller tubercles ; posterior margin 

 denticulate ; base expanded ; pulp cav- 

 ity large. Type G. typus. 



Fig. 1132.— Gampsacaiitlms typus. side view Of a 

 spine magnified 2 diam., and transverse sec- 

 tion. 



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

 Sur. 111., vol. 6, p. 474, Keokuk Gr. 



squamosus, St. John & Worthen, 1875, 

 Geo. Sur. 111., vol. 6, p. 473, St. Louis Gr. 



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

 Sur. 111., vol. 6, p. 472, St. Louis Gr. 

 Gisacantiius, St. John & Worthen, 1875, 

 Geo. Sur. 111., vol. 6, p. 440. [Ety. 

 geison, a border; akantha, a spine.] 

 Spine curved posteriorly, anterior angle 

 a simple raised keel ; lateral faces bear- 

 ing longitudinal rows of tubercles; pos- 

 terior face longitudinally keeled. Type 

 G. stellatus. 



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

 Sur. 111., vol. 6, p. 441, Kaskaskia Gr. 



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

 Sur. 111., vol. 6, p. 440, St. Louis Gr. 



Fio. 1133.— Glymmatacanthus irishi. Fragment 

 of spine. 



Glymmatacanthus, St. John & Worthen, 

 1875, Geo. Sur. 111., vol. 6, p. 446. [Ety. 

 glymmatos, engraved ; akantha, spine.] 

 Fin ray vertically elongated, posteriorly 

 arched, laterally compressed ; lateral 

 faces covered with stellate or striated 

 tubercles. Type G. irishi. 



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

 Sur. 111., vol. 6, p. 447, Kinderhook or 

 Waverly Gr. 

 petrodoides, St. John & Worthen, 1883, 

 Geo. Sur. 111., vol. 7, p. 250, Kaskas- 

 kia Gr. 

 rudis, St. John & Worthen, 1883, Geo. 

 Sur. 111., vol. 7, p. 249, Keokuk Gr. 

 Glyptolepis, Agassiz, 1836, Poiss. Foss., 

 vol. 2, p. 179. [Ety. glyptos, sculptured ; 

 lepis, scale.] Fins long, sometimes pen- 

 dulous; anterior dorsal opposite ven- 

 tral, and posterior dorsal opposite anal ; 

 tail fin long, spreading below ; shoulder 

 bones huge; teeth minute; scales of 

 great size in proportion to the animal, 

 and deeply sculptured. Type G. el- 

 egans. 

 microlepidotus, Agassiz, 1836, Poiss. 



Foss., vol. 2, p. 179, Devonian, 

 quebecensis, Whiteaves, 1889, Trans. 

 Roy. Soc. Can., vol. 6, p. 77, Low. 

 Devonian. 

 Gnatiiokhiza, Cope, 1883, Proc. Am. 

 Phil. Soc, vol. 20, p. 629. [Ety. 

 gnathos, jaw ; rhiza, root.] Founded 

 upon some ganoine teeth. The def- 

 inition is too meager for identifica- 

 tion, and the genus may never again 

 be recognized. Type G. serrata. 

 eerrata, Cope, 1883, Proc. Am. Phil. 

 Soc, vol. 20, p. 629, Permian. 

 Gyra< antiii'n, Agassiz, 1833, Recherches 

 sur les I'oissons Fossiles, t. 1, p. 87. 

 [Ety. gyros, a circle ; akan- ^ 

 tha, spine.] Fin spines 

 very large, gradually ta- 

 pering to the apex, and 

 slightly arched back 

 ward; inserted base 

 small, rapidly tapering ; 

 posterior margin feebly 

 armed with two rows of 

 small denticles; surface 

 of the sides covered with 

 very oblique ridges, which 

 meet at an angle on the 

 anterior face. Type G. 

 formosus. 

 a 11 en i, Newberry, 1873, 

 Ohio Pal., vol. 1, p. 331, 

 Cuyahoga shale, 

 compressus, Newberry, 

 1873, Ohio Pal., vol. 1, p. 

 230, Cuyahoga shale, 

 cordatus, St. John & Wor- 

 then, 1883, Geo. Sur. 111., 

 vol. 7, p. 251, Keokuk Gr. 

 duplicates, Dawson, 1868, 

 Acad. Geol., p. 210, Coal 

 Meas. 

 magnificus, Dawson, 1868, 

 Acad. Geol., p. 210, Sub- 

 carboniferous. Fig. 1134.— (iy- 

 Harpacodus, Agassiz, 1869, facauthus ai- 

 Catal. Foss. Fish, Collec- £ n e ; A ^ eri ^ 

 tion of Earl of Enniskil- 

 leh, and St. John & Worthen, in Geo. 

 Sur. 111., vol. 6, p. 354. [Ety. harpe, a 



