588 



PISCES. 



[ASP. — BOT. 



richthys, but many times larger and 

 covered with large, hemispherical, 

 smooth, enameled tubercles. Type A. 

 clavatus. 

 clavatus, Ntwberry, 1873, Ohio P;d.. vol. 

 1, p. 323, Portage Gr. 



Fio. 1102.— Aspidichthys clavatus. 



Axpidodus, Newberry & Worthen, 1866, Geo. 

 Sur. 111., vol. 2, p. 92, syn. for Pse- 

 phodus. 



convohttu8, see Psephodus convolutus. 



crennlatus, see Psephodus crenulatus. 

 Asteracanlhus sideriug, see Bythiacanthus 



siderius. 

 AsTEROi'TYCHius, McCoy, 1854, British Pal. 

 Rocks, p. 615. [Ety. astir, star ; ptyx, 

 wrinkle.] Bony fin-ray compressed, 

 long, slender, gradually tapering to a 

 point at the distal end, and abruptly 

 tapering at the striated proximate end 

 or base of insertion ; sides moderately 

 convex, converging to the anterior edge, 

 which is strongly, keeled ; posterior 

 face with a moderate cavity, each lat- 

 eral edge having a row of small, pointed 

 teeth, directed upward ; sides with 

 smooth, thread-like ridges, separated 

 by broader, flat, longitudinally striated 

 spaces on which are irregularly scat- 

 tered, smooth, spinous tubercles. Type 

 A. ornatus. 



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

 Sur. 111., vol. 6, p. 439, Coal Meas. 



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

 Sur. 111., vol. 6, p. 436, Keokuk Gr. 



stludovici, St. John & Worthen, 1875, 

 Geo. Sur. 111., vol. 6, p. 437, St. 

 Louis Gr. 



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

 Sur. 111., vol. 7, p. 248, Up. Coal 

 Meas. 



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

 Sur. 111., vol. 6, p. 438, Kaskaskia Gr. 



triangularis, Newberry & Worthen, 1870, 

 Geo. Sur. 111., vol. 4, p. 370, Burling- 

 ton Gr. 



vetustus, St. John and Worthen, 1875, Geo. 

 Sur. 111., vol. 6, p. 435, Waveily or Kin- 

 derhook Gr. 

 Asterosteus, Newberry, 1875, Ohio Pal., 

 vol. 2, p. 35. [Ety. aster, star; osteon, 

 bone.] Head long, narrow, broadening 

 in the occipital region ; surface covered 

 by a sheet of tuberculated enamel; 



nasal pits strongly marked ; condyle- 

 like posterior projections. Type A. 

 stenocephalus. 



stenocephalia, Newberry, 1875, Ohio Pal., 

 vol. 2, p. 36, Corniferous Gr. 

 Batacanthus, St. John & Worthen, 1875, 

 Geo. Sur. 111., vol. 6, p. 468. [Ety. 

 batos, prickly bush ; akantha, spine.] 

 Spines long, tapering, curved forward; 

 apex obtuse ; transverse section sub- 

 circular or oval, with anterior angle 

 and posterior face; lateral surfaces 

 rounded, covered with stellate tuber- 

 cles with intercostal sulci ; base moder- 

 ately inserted ; pulp cavity subcentral. 

 Type B. baculiformis. 



baculiformis, St. John <k Worthen, 1875, 

 Geo. Sur. 111., vol. 6, p. 469, Keo- 

 kuk Gr. 



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

 Sur. 111., vol. 7, p. 253, Keokuk Gr. 



Btellatus, Newberry & Worthen, 1866, 

 (Drepanacanthus (?) stellatus,) Geo. Sur. 

 111., vol. 2, p. 125, Keokuk Gr. 

 Bathychii.oduk, St. John & Worthen, 1875, 

 Otto. Sur. 111., vol. 6, p. 252. [Ety. 

 bathys, deep ; cheilos, lip ; odoxts, tooth.] 

 Teeth minute, laterally elongated, sub- 

 elliptical, sinuous in front; median 

 cusp with cutting edges flanked by a 

 pair of diverging denticles of similar 

 shape, with a minute ,, 



denticle between the lat- 4\ Ljt 

 eral and median cusps. fttV'ftf '**f 

 Type B. macisaacsi. 



macisaacsi, St. John & 



Worthen, 1875, Geo. Sur. FlG 1103< _ Ba _ 

 111., vol.6, p. 252, Middle Uiychllodus 

 Devonian. macisaacsi. 



Bothkiolepis, Eichwald, 1840, Bull. Soc. St. 

 Petersburg. [Ety. bothrion, a furrow; 



Fig. 1104.— Botliriolepis canadensis. 



lepis, a scale.] Cephalic shield some- 

 what semielliptical in outline and cov- 

 ered with plates, as in Pterichthys and 



