Li/strosaunm, 7 



frontals. The parietals with the postorbitals fo m two prominent 

 pai-allel ridges. The occipital region is much narrower, and the 

 inferior occipital processes much more api)roximated than with the 

 other known species. The palat? is most l)eautifully disphij-ed, 

 but the sutures of the bones not verj- distinctly seen. The large 

 median ridge in thefront of tlie palate is seen to be formed almost 

 entirely by the premaxillary. I' is posterior, and it articulates 

 with the median vomer. T.ie/e is a distinc and almost complete 

 secondary palate formed l)y the maxillaries and the palatines. 

 (Plate 1, Fig. 3, represents the right side of the skull with the supraorbital 

 crest restore! from that of the left side. \ nat. size.) 

 Klandsberg, near Cradock. Pres. by Mr. McCaig. 



Lijsfrjsfiifnis jj/dfi/ccps (Seeley). 



No. 12. This is the s'niU which has been described by Prof, 

 Seeley (Ann. and i\Iag. Nat. Hist., Feb. 1<S'.).S), under the name of 

 Mochlorhinus plaUjcep^. In many respects it agrees very closely 

 with Li/sfrosaunis McGaigi, and it is just possible that the tlitfer- 

 ences may be sexual or due to this smaller skull being immature. 

 I am inclined, however, to regard the two species as distinct. I 

 cannot agree with Prof. Seeley in regarding this specimen as the 

 type of a new genus. The characters on which he founds the genus 

 Mochlorhinus, are : — " 1st, the usual angular ridge between the 

 upper surface of the skull and face is wanting ;" 2nd, the palate 

 has the vomer elevated in front of the palato-nares, and the 

 palatine bones at their sides, so as to form three prominent 

 tubercles," and " upon the summits of these tubercles are minute 

 teeth ;" and 3rd, " the head appears to be much more compressed 

 from side to side than is usual in Ptychognatliusy With regard 

 to these features it may be pointed out ; 1st, that though owing 

 to the skull being narrower and the supraorbital crests being much 

 more prominent, the transverse angular ridge is less developed, it 

 is still ({uite distinct though rounded, and the top of the snout 

 makes with the plane of the prepai-ietal a less obtuse angle than is 

 met with in any of the other species ; 2nd, the three tul)erclevS 

 found on the palate are formed not by the vomer and the palatines, 

 but by the premaxillary and the palatines. They are exactly 

 similar to those found in Li/s/rosaifrii.s MrCai<ji\ and differ very 

 little from those in other species of Lyntrosuanis, and 1 cannot 

 find any indications of teeth on any of the tubercles ; ami ii.d. tlie 



