332 THE PROCEEDINGS OF THE LINNEAN SOCIETY 



24 is a very wretched rendering of my sketch, and gives the 

 impression of having been drawn, not from part of the body of 

 an animal, but from a wooden model ; the outlines, however, are 

 correct.) 



Fig. 24. — Extremity of the appendage viewed from the inner 

 side, fixed with the aid of hooks, with the last joint flexed, in 

 order to afford a view of the groove. Owing to the flexed position 

 of the appendage and of the sac or pouch f, which is wide open. 



PLATE 25. 



Heterodontus galeatus, GilntJier. 



Figs. 25 and 26. — Drawings of the Heierodonius galeatus from 

 above and from the side from a stuffed specimen in the Australian 

 Museum. In order not to alter further the appearance of the 

 animal already considerably distorted by the process of stuffing, I 

 have caused photographs of the animal in question to be copied. 

 Although the whole of the general surface of the skin, with the 

 exception of the ventral portion, is very dark, six transverse bands 

 •are visible. The band on the upper surface of the head is the most 

 distinct. Though the colouring of this dried specimen may be 

 somewhat different from that of the same animal in the fresh 

 state, yet it is decidedly different from that of ff. PhilUpi*. 



Fig. 27. — Front view of the head (necessarily very diagram- 

 matic, owing to the condition of the specimen), to shew the two 

 very prominent supra-orbital ridges characteristic of the species. 



Fig. 28. — Ventral view of the anterior end of the head (also 

 very diagrammatic) to shew the front teeth (very wretchedly 

 rendered by the artist, but with the number correct.) 



Fig. 29. — Ventral view of the anterior end of the head of a 

 ff. PhilUpi (from a perfectly fresh specimen). The lower jaw, 

 the labial folds, and the upper jaw are removed, to shew the 

 nasal grooves with their two openings. On the right hand side 

 the parts are in situ ; on the left, a horizontal section has been 

 made ou a plane passing through both the external and the 

 buccal narial apertures, displaying the whole course and relations 

 of the groove. 



