690 



PISCES. 



[CHI. CXA. 



lured, and ranged diagonally in wavy 

 lines. Type C. trailli. 



canadensis, YVhiteaves, 1881, Am. Jour. 

 Sci. and Arts., 3d ser., vol. 21, p. 496, 

 Up. Devonian. 



CHITOXODUS, St. John & AVorthen, 1883, Geo. 

 Sur. 111., vol. 7, p. 109. [Ety. chiton, a 

 smock or coat ; odom, tooth.] Mandib- 

 ular posterior teeth trapezoidal, arched 

 in the direction of inrollment ; median 

 teeth narow, inrolled longitudinally; 

 maxillary posterior teeth subquadrilat- 

 eral, arched, and inrolled along the 

 outer margin. Type C. spingeri. 



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

 Sur. 111., vol. 7, p. 116, Low. Burling- 

 ton Gr. 



latus, Leidy, 1856, (Cochliodus latus,) 

 Trans. Am. Phil. Soc., vol. 11, p. 87, pi. 

 5, fig. 17, Keokuk Gr. 



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

 Sur. 111., vol. 7, p. 119, Sf. Louis Gr. 



rugosus, Newberry & Worthen, 1866, 

 (Po3fJlodus rugosus, P. ornatns, and P. 

 convolutus,) Geo. Sur. 111., vol. 2, pp. 

 94, 95 ; vol. 4, p. 366, Keokuk Gr. 



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

 Sur. 111., vol. 7, p. 112, Up. Burling- 

 ton Gr. 



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



Sur. 111., vol. 7, p. 117, Keokuk Gr. 

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

 Sur. 111., vol. 6, p. 415. [Ety. cholos, de- 

 fective; odous, tooth.] Distinguished 

 from Peltodus and 

 Fissodu*, by the 

 eccentrically lobed 

 crest and extreme 

 downward pro- 

 longation of the 

 lateral extremities 

 of the coronal 

 fold in the convex 

 face. Type C. inseqnalis. 



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



Sur. 111., vol. 6, p. 416, Coal Meas. 

 CIIOMATODUS, Agassiz, 1843, Recherches sur 

 les Poissons Fossiles, t. 3, p. 107. [Ety. 

 choma, a pile or heap; odous, 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, Newberry & Worthen, 1866, Geo. 

 Sur. 111., vol. 2, p. 54, Keokuk Gr. 



angularis, see Tanaodus angularis. 



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

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

 243, Coal 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 & Worthen, 1866, Geo. 

 Sur. 111., vol. 2, p. 85, Keokuk Gr. 



,Fio. 1108 Cholodus 

 . , insequalis. Con- 

 vex mce. 



cultellus, Newberry & Worthen, 1866, 



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



kia Gr. 

 elegans, Newberry & Worthen, 1866, Geo. 



Sur. 111., vol. 2, p. 86, Keokuk Gr. 

 gracillimus, see Tanaodus gracillimus. 

 incoustans, St. John & AVorthen, 1875, 



Geo. Sur. 111., vol. 6, p. 360, St. 



Louis Gr. 

 incrassatus, St. John 



& Worthen, 1875, 



Geo. Sur. 111., vol. 



6, p. 359, St. Louis 



Gr. . FIG. 1109. Chomatodus 



msignis, Leidy, 1856, incrassatus. 



Trans. Am. Phil. 

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

 linearis, Agassiz, 1843, (Psamuaodus line- 

 arin,) Recherches Pois. FOBS., t. 3, p. 

 108, Subcarb. 



loriformis, Newberry & AVorthen, 1866, 



Geo. Sur. 111., vol. 2, p. 58, Keokuk Gr. 



molaris, Newberry & AVorthen, 1866, Geo. 



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

 multiplicatus, see Tanaodus multiplicatus. 

 obscurus, see Tanaodus obscurus. 

 parallel us, St. John & AA r orthen, 1875, 

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

 saw Gr. 



pufdllus, Newberry & AVorthen, 1866, 

 Geo. Sur. 111., vol. 2, p. 53, Keokuk Gr. 

 varsoviensis, St. John & AVorthen, 1875, 

 Geo. Sur. 111., vol. 6, p. 393, AVarsaw Gr. 

 venustus, Leidy, see Venustodus leidyi, 

 where the specific name is made to des- 

 ignate the genus, and the author the 

 specific name, contrary to the rules of 

 notnenclatare; also see Venustodus ve- 

 nustus. 



CLADODUS, Agassiz, 1843, Recherches sur les 

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

 klados, twig ; odous, 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 ; medial 

 cone much larger than the secondary 

 ones, of which latter the exeraal cones 

 are the larger; all the cones striated 

 longitudinally, and either circular in 

 section or with simple cutting edges, 

 slightly compressed. Type C. mirabilis. 

 acuminatus, N e w - 

 berry, 1857, Proc. 

 A cad. Nat. Sci. 

 Phil., vol. 8, p. 99, 

 and Ohio Pal., vol. 

 2, p. 45, Subcarbo- 

 niferous. 



alternatus, St. John 

 & Worthen, 1875, 

 Geo. Sur. 111., vol. 

 6, p. 265, AVaverly 

 or Kinderhook Gr. 

 angulatus, Newberry & Worthen, 1866, 

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

 kuk Gr. 



FIG. lllO.-Clndodns 

 aeum hiatus. 



