1904.] LABYRINTIIODONT SKULLS. 173 



the inner edge of the quachute (qu.). The quadratojngal is in 

 contact with the quadrate only at its lower end, thus leaving a 

 rathei' large postero-temporal vacuity (ptv.) which is especially 

 well seen on the left side. 



The complete occipital region, as here interpreted, is shown 

 in the accompanying restored sketch (text-fig, 34, p. 172). It 

 obviously conforms much more closely to the Amphibian type 

 than to the arrangement in any known reptile. It therefore 

 agrees with the evidence deiived from the palate and the 

 supi-atemporal plates, showing that the Labyrinthodonts are 

 Amphibia. 



The characters of the ciunial roof, the anterior end of the 

 palate, and the teeth, prove that the skull now described belongs 

 to the genus Capitoswarus. It cannot, however, be referred to 

 any of the known species of this genus. It differs from the skull 

 of the type- species, C.arenacetis, from the Keuperof Franconia*, 

 in the nan-ower and more tapering form of its rostral region, the 

 more elongated shape of the oi-bits, and its more nearly circular 

 pineal foramen. It is distinguished from the skulls of C. nasutus t 

 and G. rohusius +, among other characters by the slighter excava- 

 tion of its occipital border and by the shape of the outer pair of 

 its supratemporal plates. It is also distinguished from the im- 

 perfectly known skull of G. fronto § by the different shape of 

 its auditory notch and the coarseness of its external orna- 

 mentation. The new specimen therefore represents a hitherto 

 unrecognised species, which may be named G. sianionensis. 



II. Aphaneramma rostratum, gen. et sp. nov. (Plate XII.) 



The imperfect Labyrinthodont skull from Spitzbergen was 

 found by Profs. J. W. Gregory and E. J. Garwood in the Trias 

 of Sticky Keep, associated with a few short and deep, biconcave 

 vertebral centra, which probably belonged to the same animal. 

 It is broken into five pieces, which show little beyond impressions 

 of the bones. Three fragments are internal moulds, while the 

 other two pieces bear marks of the exterior. The right half of 

 the postorbital region and the middle portion of the rostrum are 

 missing. Enough, however, is preserved to indicate that the 

 skull must have been of a much elongated shape, with a slender 

 snout. It is very little depressed behind, and the occipital plane 

 slopes backwards. Its extei-nal surface was ornamented with 

 large reticulating rounded ridges, which wei'e sometimes inter- 

 rupted, as shown by the impression of part of the left cheek 



* Graf zu Miinster, Neues .lahrb. fiir Min. 1836, p. 580; II. von Meyer, 'Die 

 Saurier des Muscliolkalkcs ' (18d7-5o)_, p. 152, pi. lix. fig.s. 5-7. 



t H. von Meyer, J^alaiontogr. vol. vi. (1858), p. 222, pis. xxiv.-xxvi. 



X H. von Meyer, ' Die Saurier des Musclielkalkes ' (1847-55), p. 146, pi. lix. 

 figs. 1-4, pi. ixi. fig. 10. Cyclotosaurus rohustus, E. Fraas, Palscontogr. vol. xxxvi. 

 (1889), p. 121, pis. ix., X., pi. xi. figs. 1-4. 



§ H. von Meyer, Palajontogi-. vol. vi. (1858), p. 229, pi. xxviii. fig. 2. 



