1 70 DR. A. SMITH WOODWARD ON [June 7, 



11. On Two New Labyriiithodont Skulls o£ the Genera 

 Cajjitosaurus and Aphaneranima. By A. Smith Wood- 

 WAKD, LL.D., F.R.S., F.Z.S. 



[Received June 3, 1904.J 



(Plates XI. & XII.*, and Text-figure 34.) 



Among the remains of Labyrinthoclonts acquh-ecl by the British 

 Museum during recent years, there are two skulls of unusual 

 interest. One was obtained from the Triassic sandstone of 

 Staffordshire, while the other was found in a formation, appa- 

 rently of the same geological age, in Spitzbergen. The first 

 specimen is of importance as displaying the occipital region 

 of the skull more cleai'lj^ than any Labyrinthodont hitherto 

 described ; and the second specimen adds facts concerning the 

 shape and relations of the quadrate bone. Each fossil represents 

 a new species, while the second is the only skull of a Labyrintho- 

 dont as yet described from the Arctic Regions. 



I. Capitosaurus stantonensis, sp. nov. (Plate XL) 



Tire discovery of the Staffordshire specimen in the Lower 

 Keuper sandstone of Stanton, near Uttoxeter, was briefly noticed 

 by Mr. John Ward four years agof. The block of sandstone 

 containing the skull w^as split along the j)lane of the cranial roof, 

 leaving most of the roof-bones adherent to one slab, while the 

 impression of these, with the rest of the skull, remained in the 

 counterpart-slab. When Mr. Ward examined the fossil it was 

 still in the condition in which it had been exposed by the acci- 

 dental fracture ; so that his description could only be of a general 

 and preliminary nature. Since its acquisition by the British 

 Museum, both parts of the specimen have been skilfully prepared 

 by Mr. G. Barlow ; and the principal characters of the skull, as 

 now observable, are illustrated in Plate XL 



The skull does not appear to have been much distorted by 

 crushing, and its shape closely resembles that of the skull of a 

 broad-nosed crocodile. All the external bones are similarly 

 ornamented with a coarse network of shai'p ridges. The occipital 

 border is slightly excavated, and the deep notches for the auditory 

 meatus {cm.) are nearly, if not completely, surrounded by bone. 

 The specimen is a little fractured in this region. The orbits 

 (orh.) are set far back, only of moderate size and regularly oval 

 in shape, with the long axis directly antero-posterior, not oblique. 

 The pineal foramen [jmi.) is a rather large circular vacuity. 



* For explanation of the Plates, see p. 176. 



t J. Ward, "On tlie Occurrence of Labyrinthodont remains in the Keuper Sand- 

 stone of Stanton," Trans. N. Stall's. Field Club, vol. xxxiv. (1900), pp. 108-112, 

 pis. iv., V. 



