82 C. W. Andrews — On Kemterpetum Galvani, Huxley. 



Engineers, vol. x. 1890, pi, ix. fig. 2) as Keraterpetum Galvani. 

 This figure, which is natural size, unfortunately does not show any 

 details of the structure of the skull, sonie account of which may be 

 of interest. 



Dorsal surface of skull of Keraterpetum Galvani, Huxley, s.oc. supra- occipital, 

 ep. epiotic, sq. squamosal, s.t. supra-temporal, pa. parietal, p.f. post-frontal, 

 p.orb. post-orbital, jug. jugal, fr. frontal, p.for. parietal foramen. 



The thick dotted lines on the right side of the figure mark the position of the 

 lateral line pits. Twice natural size. 



The general outline of the skull (see figure) closely resembles 

 that shown in the figure of the type specimen of Keraterpetum 

 Galvani given by Huxley (Proc. Eoy. Irish Acad. vol. xxiv. 1867, 

 pi. xix. fig. 1). The snout is blunt and rounded, and the hinder 

 border of the skull is produced backward into two pairs of cornua, 

 of which the external pair, formed by the quadrate region, is much 

 less prominent than the internal pair (epiotic), and as far as can 

 be seen, does not extend quite so far backward as the base of the 

 latter. The exact limits of the outer pair are rather indistinct, and 

 of the inner pair, that on the animal's right is broken away. In 

 the posterior region of the skull, the dorsal side of which is 

 exposed, the outer surface of the cranial bones is well seen, but 

 in front only the impressions of bones remain and it is almost 

 impossible to determine their arrangement. On the counterpart, 

 however, this can be made out to some extent. The external 

 surface of the bones is covered by a sculpture of pits arranged 

 roughly in parallel or radiating lines, an ornament closely resembling, 

 on a small scale, that seen in Loxomma. The pits are close together, 

 being separated only by narrow ridges. At the bottom of many of 

 them there is a small pore with a slightly raised rim, such as 

 occur also in Loxomma. These pores were probably connected with 

 dermal glands. Eunning directly forward from the hinder border 

 of the skull, near the inner side of the base of the epiotic cornua, 

 there is on either side a row of larger pits which can be traced to 

 the neighbourhood of the eye, where it is probably continuous with 

 a still more distinct series forming a curved line parallel to the 



