PAL^EOXISCIDJE. 
451 
p. 14). There are no examples in the Collection, and the following 
is the only recognized species : — 
Benedenichthys cleneensis , R. H. Traquair, Eaune Calc. Carb. Belg. 
pt. i. (1878), p. 16, pi. ii., and Trans. Roy. Soc. Edinb. 
'sol. xxix. (1879), p. 354, pi. iii. fig. 17 (Benedenius) : 
Palceoniscus deneensis, P. J. Van Beneden, Bull. Acad. Roy. 
Belg. yoI. xxxi. (1871), p. 512, pi. iv.—Carboniferous 
Limestone : Denee, Belgium. [Imperfect fish ; University 
of Louvain.] 
Genus OKEIIiOIjEPlSj Agassiz. 
[Poiss. Loss. vol. ii. pt. i. 1835, p. 128.] 
Trunk elongated and gradually tapering from the maximum 
depth at or immediately behind the pectoral arch. Mandibular 
suspensoiium o clique : dentition consisting of an inner series of 
laige, well-spaced conical teeth, with an outer series of numerous 
verj small teeth; head and opercular bones ornamented with 
striations, irregular rugae, or elongated tubercles. Pius of moderate 
size, consisting of numerous very delicate rays, articulated and 
branching; fulcra prominent, and the ridge-scales of the upper* 
caudal lobe distinctly divided into two halves at the apex. Pelvic 
fins with extended base-line; dorsal fin scarcely longer than deep, 
the anal elongated, and the former not arising in advance of the 
origin of the latter: upper caudal lobe short and stout, the fin 
inequilobate and only slightly forked. Scales minute, relatively 
thick, and coated with ganoine, having an internal vertical rib, not 
overlapping. 
The most elaborate description of Cheirolejpis , with numerous 
figures, is that of Pander, published in 1860 1 2 ; and additional ob¬ 
servations, with corrections, were subsequently contributed by 
Traquair". By Pander the genus was regarded as representing a 
peculiar family, Cheirolepidse, afterwards adopted by Huxley 3 ; but 
the researches of Traquair seem to justify its being assigned to the 
Pakeoniscidae. 
1 C. H. Pander, Ueber die Saurodipt., Dendrodont., Glyptolepid., u. Cheiro- 
lepid. devon. Sjst. (1860), pp. 69-73. 
2 R. H. Traquair, Ann. Mag. Nat. Hist. [4] vol. xv. (1875), pp. 237-249, 
pi. xvii. 
3 T. H. Huxley, Pigs. & Descrips. Brit. Organic Remains (Mem. G-eol. Surv. 
1861), dec. x. pp. 38-40. 
2 g 2 
