166 REPORT—1874. 
plates. Lateral plates triangular, with a reflected process at the outer angle ; radiately 
sculptured. Vertebre. Centra completely ossified, somewhat broader than long, 
constricted in the middle, biconcave. Scutes. A ventral armour, consisting of im- 
bricated oat-shaped scutes, occurs between the pectoral and pelvic limbs. 
Measurements (from Prof. Huxley’s Memoir). 
in. 
rere OPeattH Of SONS Mort ss sen cue me deh + > os hems (about) 5 
Gera AMONG shoe pie t tiny so Rte Me pete wrmiere eye ce.g.e s+ os cue em df 
WenennvoLmrembexl! (ary TOOtM. nt hia uet emiuect eye oes syne «ic anes 2 
Total length of head, trunk, and tail (slightly imperfect) ........ 43-4 
P. prsciForMis, Huxley. 
Locality. Edinburgh Coal-field. 
References. Huxley, Q. J. Geol. Soe. vol, xviii. p. 294, t. x. figs. 1, 4 [1862]. 
Ichthyerpeton, Huxley. 
Vertebre, Centra discoidal; caudal vertebrae imperfectly ossified P Ribs 
(posterior dorsal region). Short, tapering. Seztes. A ventral shield of minute 
scutes disposed in a chevron pattern. Hind limb, “Four distinet digits, with 
three short and thick phalanges in each, can be distinguished; the fifth digit is not 
apparent.” 
Measurements (from Prof. Huxley’s Memoir and Plate). 
Antero-posterior depth (superficial) of vertebral centrum ........ 15 
Bengthvol 10 thoracic: vertebrae’ .). 50 - + wlele «+ vow'e oh eietel tests om eels 16 
I, BrapLEy®, Huxley. 
Locality. Jarrow Colliery, Kilkenny. 
References. Huxley, “Description of Vertebrate Remains from the Jarrow 
Colliery, Kilkenny,” Trans. Royal Irish Acad. vol. xxiy. p. 17, t. xxiii. 
fig. 1 [1867]. 
Pholiderpeton, Huxley. 
Teeth (structure). Maxillary and mandibular series nearly uniform; a detached 
tooth of large size has been distinguished upon the same slab with a skull and 
vertebral column; the teeth are conical, pointed and recurved at the apex. Cranial 
sculpture. Close and irregular pitting. Vertebre. Centra well ossified, discoidal, 
biconcave. Ribs. Long, stout, and curved, some bicipital. Scwtes. A ventral 
armour of large bony scutes, most of which are elongate, pointed at one end and 
rounded at the other, with a raised central ridge. 
Measuremenis. : 
in. 
Average length of maxillary teeth .......... 0... ccc cee veeueees 45 
Antero-posterior depth (superficial) of largest vertebral centrum .. “4 
Greatest width of vertebral centrum ............ 0.0. cece rece eed. 
Length of longest rib preserved (chord) ............00 ccc ee ees ‘ 
P. scuTiceruM, Huxley. 
Locality. Toftshaw, near Bradford, Yorks. 
References, Huxley, Q. J. Geol. Soc. vol. xxy. p. 309, t. xi, [1869]. 
VI. ARCHEGOSAURIA, 
Archegosaurus, Goldf. 
Skull (figure), Triangular, with rounded angles, sides slightly convex. Orbi 
Situate in the posterior half of the skull (A. Decheni), or abovs the middle (4. 
