4 
decrease ag’aiu l)aek\vards and finally become extremely delicate. The 
transverse articnlations arc very numerous and 1 ) 01^111 not far from the base of 
tbc rays ; while distal bifurcation is conspicuous in all l)ut about ten of the 
anterior rays. 
To demonstrate the striking difference between the Coclacanth fin thus 
dcscril)ed and the obtusely lobato pectoral of the existing Crossoptcrygian 
Foli/pteriis, an outline-sketch of tin; latter is given in PI. II, Pig. 2. It will 
be observed that in Fohiptenis the endoskeletal supports of the lobe arc 
arranged much as in modern sharks, whereas those of the Ccelacanth more 
closely approach the basal ia of an ordinary Actinoptcrygiau fish. 
Orric;*— ACTINOPTERYGII. 
PlewiVy— PALiEONISCID.®. 
Genus — COCCOLEPIS, Agassiz, 1844. 
(Poiss. Toss., IJ, Pt. 1, p. .300.) 
Gen. Char . — Trunk elegantly fusiform. Mandibidar suspensorinm 
oblique ; dentition consisting of an inner series of large laniaries flanked 
externally with minute teeth ; external bones tubercnlated or rugose. Pins 
large or of moderate size, all the rays articulated and branching distally ; 
fulcra minute or absent. Pelvic fins extended ; dorsal and anal fins triangvdar, 
the former opposed to the space between the latter and the pelvic fins ; upper 
caudal lobe mucb elongated, the fin deeply cleft and somewhat unsymmetrical. 
Scales thin and deeply imbricating, ornamented with tuberculations of 
ganoine. 
Ohs . — The genus thus defined is represented by small species in 
the Lithographic Stone (Lower Kimmcridgian) of Bavaria\ and in the 
Pnrbeck Beds” and Lower Lias^ of England. It is therefore of much 
interest to find a large fish in the Ilawkesbury-Wianamatta Scries of Tal- 
bragar exbibiting characters so similar as not to be more than specifically 
distinguishable. 
' Coccolt'pi.^ BucIJaiiiU, L. Agassiz, Poiss. Foss., 1844, Pt. i, p. 300, ])1. xxxvi, ligs. (i, 7. 
^ Cocrohpis AiKlreirxi, Smith Woodwanl, Brit. Mn.s. Cat. Foss. Fishes, 1891, Pt. ii, p. r)24. 
® Coccoloph liaxsica, Smith Wooihvard, Ann. Mag. Nat. Hist., 1890, v. [O] p. 43.5, pi. xvi, ligs. 2-4. 
