OF NEW SOUTH WALES. 331 



Fig. 19.— Anterior paveraenfc-like teeth of an older specimen. 

 A — two teeth of the middle row of the upper jaw ; B— four 

 teeth of the three middle rows of the lower jaw. 



Fig. 20 — 24. — Male sexual appendages of an adult B. Phillipi. 



Fig. 20. — Appendage in section from above, from the ventral 

 aspect. The undulating lines indicate the rougher dermal 

 covering, armed with scutes, c and c' — groove ; d — spine on 

 the outer border of the groove ; f — fissure leading into a pouch 

 situated on the under side of the appendage. 



The dotted lines marked I, II, and III shew the points where 

 the vertical transverse sections (fig. 21) are carried through. 



Fig. 21, I. — Vertical transverse section through the base of 

 the appendage and through the ventral fin ; g — cartilage of the 

 appendage and of the fin ; m — muscles of the same ; i — the 

 muscular pouch Q^ poche musculeuse^^ of Dumeril) opening into 

 the groove and situated on the under surface of the ventral fin. 



II. — Vertical transverse section through about the middle of 

 the appendage. ; g — cartilage ; m — muscles of the appendage ; 

 c — groove (" sillon " of Dumeril). 



III. — Vertical transverse section through the end of the ap- 

 pendage, below the spine ; c — the groove divided by a thin fold 

 (k) of the mucous membrane ; f — pouch. 



Fig. 22, IV. —Longitudinal section through the appendage, to 

 shew all the connections of the groove, with the two pouches, i 

 and f. 



(These four were all made and drawn from quite fresh speci- 

 mens.) 



Fig. 23. — Male sexual appendages of a larger specimen. The 

 specimen from which the sketch was made lies on the right side 

 the ventral surface directed forwards, with the appendages 

 crossed over one another. (This position of the appendages I 

 have noticed in many dying and dead specimens of Eeterodontus.) 

 The right appendage is stretched out along the middle line of 

 ihe body, the left one hanging below ; it is drawn back by means 

 of three hooks, so that the groove (c and c') is to be seen. The 

 spine (d) is by this means " thumblike " extended and abducted. 



k is a slight longitudinal fold. (N.B. — Fig. 23 as well as fig. 



