24 MR. EDWARD DEGEN ON THE 



laterally situated nerve-canals which at this point jjerforate the 

 bone. Other examples of a very broad nasal process of the 

 prsemaxillary are to be found in Lacerta ocellata, L. viridis, 

 L. agilis (text-fig. 6, I) ; and reference to Dr. Siebenrock's 

 text and figures for L. simonyi * also shows the latter to belong 

 distinctly to the broad type, and consequently not — as he points 

 out, when referring to this feature^ — being distinguished by 

 a " long and slender " type of processus nasalis the same as in 

 Eremias arguta, with which he likens L. simonyi as regards this 

 charactei'. 



In Lacerta dugesii I find the shape of the nasal process occupies 

 a position intermediate between L. jacksoni, the species here dealt 

 with, and those possessing a nasal process of distinctly slender 

 and elongate shape. Most of the true imtralis forms belong to 

 the latter (text-fig. 6, F & G). Lacerta echinata, L. vivipara 

 (text-fig. 6, H), and L. loevis must also be considered intermediate 

 forms in this respect. Allowance for individual variation, how- 

 ever, must be made, as the examination of three skulls of the 

 latter species, all males, clearly demonstrates. 



The very low angle at which this nasal process rises at its 

 issue from the maxillary portion of the bone is merel}' due to 

 the strongly depressed type of the skull itself, as, in fact, in 

 a,ny of the typically platycephalous forms, e. g. L. mosorensis or 

 L. oxycephala, and differing from the more or less convex types 

 of skulls in which this process is more highly arched. 



JVasal hones. — Owing to the profuse incrustation of the upper 

 surface of the skull, their contours in this specimen are very 

 ill-defined. All that can be said on this head is that they 

 are oblong, of a scaly nature, and that they widely diverge 

 behind to receive between them the anterior and pointed pro- 

 cessus nasalis of the frontal bone. Their length approximately 

 equals their combined width at the widest part between the 

 prasfrontal bones. 



The Prefrontals also appear very irregular in their upper out- 

 lines and in their relations to the maxillaries, the frontal, and the 

 nasals. The spinous posterior process, which forms the anterior 

 border of the margosupraorbitalis, seemingly does not reach much 

 farther backward here than the suture between the first and the 

 second supraorbitals. 



The Lacrymal bones are clearly defined, exceedingly thin, 

 narrow, and blade-like in shape. In their situation at the 

 anterior angle of the orbital cavity, they foi^m, together with the 

 incisura lacrymalis of the prpefrontals, a well-developed foramen 

 lacryviale. 



Jugulars. — Their zygomatic processes are represented by a 

 rather short, but acutely pointed spine. Their temporal processes 

 are somewhat straighter than is the case in Lizards having 

 deeper skulls, in all of which they usually are of a more sigmoid 

 form. 



* i.e. p. 32, Taf. ii. tig-. 8. 



