ON THE CLASSIFICATION OF THE LABYRINTHODONTS. 171 
K. Gatvant, Huxley. 
Locality. Jarrow Colliery, Kilkenny. 
References. Huxley, “Description of Vertebrate Remains from the Jarrow 
Colliery, Kilkenny,” Trans. Royal Irish Acad. vol. xxiv. p44, t. xix. 
IX. AISTOPODA. 
Qphiderpeton, Huxley. 
Skull, In all the examples hitherto discovered the skull was in an unsatisfactory 
state of preservation. Prof. Huxley remarks concerning one of these that “the roof 
of the skull is broad, and has an obtuse and rounded anterior end ; the ramus of the 
mandible is strong, and has a curved lower contow, its articular end being especially 
curved up.” Vertebre. The number may have amounted to one hundred or more; 
centra elongate, contracted in the middle; spinous processes low, shorter antero- 
posteriorly than the centra. Ribs. Long, nearly straight. Limbs. Probably want- 
ing; no trace of fore or hind limb has occurred in any one of several specimens 
which have been discovered in Ireland and Northumberland. Sceutes. A ventral 
shield, long and narrow, made up of elongate, imbricate, slightly curved scutes, dis- 
posed in a chevron pattern, 
Measurements (from Prof. Huxley’s Memoir). 
Total length of the largest example (incomplete) 
Length of middle vertebra of ditto... ...... csc eee twee cree 25 
Length of the largest skull 
O. Brownricen, Huxley (0. nanum, Hancock & Atthey ?)*. 
Locality. Jarrow Colliery, Kilkenny (O. Brownriggii); Newsham Colliery, 
Northumberland (0. nanum). 
References. Huxley, “ Description of Vertebrate Remains from the Jarrow 
Colliery, Kilkenny,” Trans. Royal Irish Acad. vol. xxiv. p. 14, t. xxii. [1867]. 
—Hancock & Atthey, Nat. Hist. Trans. Northumberland and Durham, 
vol, iii. p. 79 [1869]. 
Delichosoma, Huxley. 
Skull (figure). “ Narrow, tapering from the occiput to the snout, so as to have 
the form of an isosceles triangle ; the lower jaw repeats the form and general dimen- 
sions of the head, and has very slender rami” (Huxley). Vertebre. Complete 
number unlmown; about fifty in the single incomplete specimen hitherto disco- 
yered ; centra stout, slightly constricted; neural spinous processes low; zygapo- 
physes apparently well developed. ibs. Slender, straight, short (hardly longer 
than the vertebrae), rapidly tapering. Limb. No trace of fore or hind limb in the 
single example known. 
Measurements (from Prof. Huxley’s Memoir). 
in. 
A tol ear iterststeMe Narre ss, shir cs 4 a.% > sidielcad op sates. vb op cidde ce « 32 
Greatest bresditiofdidll....<......0.scc 0s ceencwecune cle ceee 13 
Merigin OF WO AMtetIOn VELLCDTS occ ec ssc cet ee ess ests vues 55 
Total length of head, trunk, and tail (incomplete) ...........4+. 37 
D, Emersont, Huxley. 
Locality. Jarrow Colliery, Kilkenny. 
References. Huxley, “Description of Vertebrate Remains from the Jarrow 
near Kilkenny,” Trans. Royal Irish Acad. vol. xxiv. p. 16, t. xxi. fig. 3 
18687]. 
* Doubtfully distinct. The specimen is very imperfect, and differs chiefly in size from 
0. Brownriggii. 
33)/ 
