354 
AC11NOPTERT0II. 
Territ. 1870 (1871), p. 424, and Vert. Cret. Form. West 
(Itep. U.S. Geol. Surv. Territ. vol. ii. 1875), P* ^42, 
pi. xlii. fig. fi. — Upper Cretaceous (Benton Group); Bunker 
Hill, Kansas. [Imperfect trunk.] 
Pelycorapis berydnus, E. I). Cope, Bull. U.S. Geol. Surv. Territ. 
vol. iii. (1877), p.587.— Upper Cretaceous (Pierre Group); 
Kansas. [Imperfect trunk.] 
Pelycorapis varius, E. D. Cope, Bull. U.S. Geol. Surv. Territ. 
1874, no. 2, p. 39, and op. cit. (1875), p. 182 (generic 
name wrongly spelt PiUcorctpis ). — Upper Cretaceous 
(Benton Group) ; near Sibley, Kansas. [The type species. 
Imperfect trunk.] 
Family AMMODYTIDiE. 
Premaxilla excluding maxilla from border of upper j avr ’ 
dentition feeble or absent ; opercular apparatus complete, with f° w 
brancliiostegal rays. Lower pharyngeal bones separate, leitebr- 
numerous, from 45 to 05 in the total length ; centra of abdomina 
vertebra; without transverse processes. Pelvic fins, when presen • 
without spine hut with only about 6 divided rays; one extern e^ 
dorsal fin, without an anterior spinous portion. Scales, w 
present, in regular series. 
Ammodytes and the other existing genera of this family a 
characterised by the absence of pelvic fins and the great exteusi 
of the dorsal and anal fins. They are eommon on the sand} si'® 1 " 
Europe and North America, and are also known in the In< 
Ocean. 
Genus COBITOPSIS, Pomel. 1 
[Catal. Method. Vert. Foss. Loire, 1853, p. 134.] 
Trunk much elongated and slender. Snout acutely pointed, b^ 
not much produced; jaws toothless. Vertebrae about 24 to - 1 
the abdominal, 21 or 22 in the caudal region ; the cent ra elon 0 a ^ 
and much constricted. Paired fins small, the pectoral pair * nse „ C g 
on the flank, the pelvic pair very remote ; dorsal and anal 
similar and directly opposed, close to the caudal fin which is sl'c 
forked. Scales apparently absent. 
For the determination of the systematic position of this genus, the u 
is indebted to Mr. G. A. Boulenger. 
