OF NEW SOUTH WALES. 333 



Figs. 30 and 31. — Part of the upper and lower jaw of the 

 specimen in the Macleay-Museum. The shape of the teeth, and 

 their order cf sequence, is carefully rendered. Cr — longitudinal 

 ridge. 



PLATE 26. 



Heterodontus Francisi, Girard ; and H. Quoyi, Be Fremin. 



Fig. 32.- — Profile of the spirit-specimen in the Macleay 

 Museum. Circa 708 mm. (27.9 in.) in length. In this speci- 

 men there was no characteristic colouring (stripes, hands, or 

 other markings) of any kind to be observed, on which account 

 only the external outlines are given. On the uniformly dark 

 surface the lateral line was, however, to be seen. (Through the 

 carelessnes of the artist the outline, which should separate the 

 lower surface of the body from the ventral line, has been omitted. 



Fig. 33. — View of the same animal from above. 



Fig. 34. — View of the head en face to show the form of the 

 supra-orbital ridges. 



Fig. 35. — Half-open mouth in profile, to show the labial folds 

 and the external nasal apertures. 



Fig. 36. — Anterior part of the head, regarded from the ven- 

 tral side, to display the arrangement of the nasal groove, the 

 labial folds, and the anterior teeth. 



Fig. 37. — Part of the teeth of the same animal m siki^ drawn 

 as accurately as possible with the aid of compasses. In the 

 lower jaw the arrangement of the accessory cusps of the lateral 

 tri-cuspidate teeth is noteworthy. The tooth marked * shows the 

 left, that marked ** the 7ight accessory point of the teeth re- 

 markably well developed. (This is a point of importance in 

 determining to which side a tooth may belong). 



Fig. 38. — Facsimile of the drawing of Heterodontus Quoyi de 

 Freminville in the Magazine of Zoology, 1840. N.B. — The 

 figure has been reversed to facilitate comparison with the others. 

 The explanation of the figures given by M. le Chev. de Fremin- 

 ville is as follows ; — 



