590 



PISCES. 



[CHI.— CI,A. 



lured, and ranged diagonally in wavy 

 lines. Type C. trailli. 



canHdei)8 : 8, Whiteaves, 1881, Am. Jour. 

 Sci. and Arts., 3d ser., vol. 21, p. 49(5, 

 Up. Devonian. 

 CniTo.voDLs, St. John & Worthen, 188:?, Geo. 

 Stir. III., vol. 7, p. 109. [Eiy. chiton, a 

 smock or c >at ; od<>w, tooth.] Mandib- 

 ular posterior teeth trapezoidal, arched 

 in the direction of inrollment; median 

 teeth narow, In rolled longitudinally; 

 mixllary posterior teeth subquadri lat- 

 eral, arched, and in rolled along the 

 outer margin. Typp C. tpingeri. 



antiquus, St. John <& Worthen, 1883, Gpo- 

 Sur. III., vol. 7, p. 116, Low. Burling- 

 ton Gr. 



latus, Leidy, 1856, (Cochliodus latus,) 

 Trans. Am. Phil. S.c, vol. 11, p. 87, pi. 

 5, fig. 17, Keokuk Gr. 



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

 Sur. III., vol. 7, p. lit), Sr. Louis Gr. 



rugosus, Newberry & Worthen, 1866, 

 (Pee d'dus rugosus, P. ornatus, and P. 

 eonvolutus,) Geo. Sur. III., vol. 2, pp. 

 94, 95; vol. 4. p. 886, Keokuk Gr. 



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

 Sur. III., vol. 7, p. 112, Up. Burling- 

 ton Gr. 



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

 Sur. III., vol. 7, p. 117. Keokuk Gr. 

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

 Sur. 111., vol. (!, p. 415. [Ely. cholos, de- 

 fective; odt/ut, tooth.] D.stinguished 

 from Pel tod us ami 

 Fissodu-s by the 

 eccentrically lobed 

 crest and extreme 

 downward pro- 

 longation of the 

 lateral extremities 

 of the coronal 

 fold in the convex 

 f.ice. Type C. inseqnalK 



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

 Sur. III., vol. 6, p. 416, Coal Meas. 

 Chomatodus, Agassiz, 1843, Recherches sur 

 les I'oissons Fossih-s, t. 3, p. 107. [Ety. 

 choma, a pile or heap; od<>us, tooth.] 

 Teeth transversely much elongated, 

 compressed, and depressed ; crown hav- 

 ing the homologous parts of Petalodus, 

 and the form and structure of Polyrhi- 

 zodus; root short, sometimes obsolete, 

 undivided. Type C. linearis. 



affinis, Newberrv <fe Worthen, 1866, Geo. 

 Sur. III., vol. 2, p. 54, Keokuk Gr. 



angularly see Tanaodus angularis. 



arcuatus, St. John, 1870, Proc. Am. Phil. 

 Son., vol. 2, p. 435, and Pal. E. Neb., p. 

 2-13, Cod Meas. 



chesterensis, St. John & Worthen, 1875, 

 Geo. Sur. 111., vol. 6, p. 363, Kaskas- 

 kia Gr. 



comptus, St. John & Worthen, 1875. 

 Geo. Sur. 111., vol. 6, p. 356, Burling- 

 ton Gr. 



costatus, Newberry & Worth en, 1866, Geo. 

 Sur. 111., vol. 2, p. 83, Keokuk Gr. 



,Fio. 1108— Cholodns 

 , . inaHiuiilis. Con- 

 vex lace. 



6, p. 360, St. 



1109.— Chomatodus 



hxTar-satll.s. 



cultellus, Newberry & Worthen, 1866, 



Geo. Sur. 111., vol. 2, p. 52, Kaskas- 



kia Gr. 

 elegans, Newberry & Worthen, 1866, Geo. 



Sur. III., vol. 2, p. 86, Keokuk Gr. 

 graciUimus, see Tanaodus gracillimu*. 

 inconstans, St. John & Worthen, 1875, 



Geo. Sur. III., vol. 



Louis Gr. 

 incras»atus, St. John 



& Worthen, 1875, 



Gt O. Stir. Ill vol. 



6, p. 359, St. Louis 



Gr. FlG 



insignis, Leidy, 1856, 



Trans. Am". Phil. 



Sue., vol. 11, p. 87, St. Louis Gr. 



linearis, Agassiz, 1843, iPsammodus line- 



an-,1 Recherches Puis. Foes., t. 3, p. 



108, Subcarb. 



loriformH, Newberry & Worthen, 1866, 



Geo. Sur. III., vol. 2, p. 58, Keokuk Gr. 



molaris, Newberry & Worthen, 18(>6, Geo. 



Sur. III., vol. 2, p. 56, Keokuk Gr. 

 -multi pi icatua, see Tanaodus multiplicatus. 

 ob»curu*, (-ee Tanaodus obscuru*. 

 parallelus, St. John & Worthen, 1875, 

 Geo. Sur. 111., vol. 6, p. 358, War- 

 saw Gr. 

 pusillus, Newberry & Worthen, 1866, 

 Geo. Sur. III., vol. 2, p. 53, Keokuk Gr. 

 varsoviensis, St. John & Worthen, 1875, 

 Geo. Sur. III., vol. 6. p. 393, Warsaw Gr. 

 venustuH, Leidy, see Venustodus leidyi, 

 where the specific name is made to des- 

 ignate the genus, and the author the 

 specific name, c ntrary to the rules of 

 nomenclature; also see Veuustodus ve- 

 il ust us. 

 Cladodus, Agassiz, 1843, Recherches sur les 

 Poissons Fossiles, t. 3, p. 196. [Ety. 

 kladox, twig; o"ou8, tooth.] Teeth with 

 broad, horizontal, semicircular, thick, 

 bony, coarsely fibrous base, rounded 

 behind, truncated in front; crown di- 

 vided into long, sharp, subulate, con- 

 ical points, arranged along the straight 

 truncated edge of the base; mi dial 

 cone much lirger than the secondary 

 ones, of whit h latter the exer.ial cones 

 aie the larger; all the cones striated 

 longitudinally, ami either circular in 

 section or with simple cutting edges, 

 slightly compressed. Type C. mirabilis. 

 acuminatum N e w - 

 bt rry, 1857, Proc. 

 Acad. Nat. Sci. 

 Phil., vol. 8, p. 99, 

 and Ohio Pal., vol. 

 2, p. 45, Subcarbo- 

 nilerous. 

 alternatus, St. John 

 & Worthen, 1875, 

 Geo. Sur. III., vol. 

 6, p. 265, Waverly 

 ob Kinderhook Gr. 

 angulatus, Newberry & Worthen, 1866, 

 Geo. Sur. 111., vol. 2, p. 24, Keo- 

 kuk Gr. 



Fig. 1110.— Clndodus 

 actuulualus. 



