fAL^O VISCID JE. 
517 
depth of trunk contained about five and a half times in the total 
length. Head and opercular apparatus occupying one quarter of the 
total length; snout acutely pointed ; teeth long and slender, sharp, 
and somewhat bent inwards ; tuberculations of cranial roof regular 
and closely arranged, striae upon maxilla and mandible also numerous, 
but irregular, those of the expanded hinder portion of the maxilla 
chiefly concentric with the posterior and upper margins, those of 
the mandible chiefly longitudinal, but short, irregularly anastomos¬ 
ing and bifurcating. Pelvic fins two-thirds as large as the pectorals, 
arising nearer to the anal than to the latter; dorsal fin slightly 
larger than the anal, terminating opposite the anterior rays of this 
fin. Scales with prominent, sparse, superficial ridges of ganoine. 
Form, $ Log. Lower Lias: Dorsetshire. 
P. 3485. Type specimen described by Egerton, and figured loc. cit. 
pi. ix.: Lyme Eegis. The pectoral fin-rays are rightly 
noted as devoid of transverse articulations, though such 
are indicated by error in the figure; and there is some 
inaccuracy in the drawing of the superficial ornament of 
the jaws and branchiostegal rays. The striations upon 
these bones are not regular and parallel, but elongate len¬ 
ticular in form, closely interlaced, and apparently some¬ 
times branching. As remarked by Egerton in the appen¬ 
dix to his description, the apparently small size of the 
anal fin is due to its imperfect state of preservation. 
Enniskillen Coll. 
P. 557. An almost complete specimen described (with figure of 
caudal region) by Egerton, loc. cit., appendix, p. 2, pi. ix.* ; 
Lyme Eegis. The head is seen partly from beneath, 
partly from the left side, and displays the jaws, dentition, 
branchiostegal rays, opercular bones, and a fragment of 
the cranial roof. The latter bone is tuberculated; the 
operculum and suboperculum show only lines of growth 
with a few scattered pittings ; and the jaws and branchio¬ 
stegal rays are characteristically striated. Some inferior 
external bones, apparently imperfect infraclavicles, are 
marked with coarse short rugae and rounded tubercles. 
The supposed ossified vertebral centra are either small 
pleurocentra and hypocentra, or (as seems more probable) 
merely the expanded bases of the arches ; and the upper 
caudal lobe is of the ordinary Palseoniscid and Acipen- 
seroid type. The fins and scales do not require further 
