466 MTJGILIDiE. 



palatine and pterygoid bones. The height of the body is contained 

 live times and a half in the total length, the length of the head four 

 times and two-thirds. luterorbital space Hat, its ■ttidth being two- 

 sevenths of the length of the head. Snout produced, rather longer 

 than the eye ; lips thin. Procorbital with the margins serrated ; the 

 maxillaiy extends to the vertical from the anterior margin of the 

 orbit. The anterior dorsal spines rather slender, their length being 

 one-half of that of the head ; they occupj' the middle of the distance 

 between snout and base of the caudal. Caudal rather deeply emar- 

 ginate. 



Coasts and fresh M'atcrs of Van Diemen's Land and New Zealand. 



a-b, c, d. Advlt, half-grown, and young : bad state. From the Haslar 

 Collection. — Probably the tji)ical specimens of Dajaus diewensis. 

 e. Adult : bad state. Port Arthur. Presented by Sir J. Eichardson. 

 /. Adult : skin. Hobson's Bay, Port Phillip. 

 g. Many young and half-grown specimens. New Zealand. 



The original figure of Forster agrees so well with the specimens 

 from the localities mentioned, that there is no occasion to distinguish 

 a Dajaus diemensis from Forster's species. 



3. MTXUS. 



(PMiigil, sp., Cuv. Sf Val. xi. p. 149.) 

 Cleft of the mouth extending on to the sides of the snout, but not 

 to the orbit. Small teeth in a single series in the upper jaw, and 

 sometimes in the lower and on the palate. Upper lip not particu- 

 larly thick ; anterior margin of the mandible sharp. 



1. Myxus elongatus. 



D. 4 1 _!. A. I". L. lat. 45. L. transv. 13. 



A single series of fine teeth in the upper jaw, none in the lower ; 

 vomer with a narrow cross-band of teeth ; sometimes a very small 

 patch anteriorly on the palatine bones. Lips thin. Prseorbital 

 serrated anteriorly and inferiorly. The anterior dorsal spine slender, 

 its length being rather more than one-half of that of the head. 



Coasts of Australia. 



a. Skin : eleven inches long. Hobson's Bay. Presented by the 



Earl of Derby. 

 h. Skin : eleven inches long. Port Jackson. Purchased of Mr. 



Gould. 



Although I have only two skins of this species, its characters are 

 so marked that it ■will be readily recognized even from the incom- 

 plete description which I am enabled to give. The body appears to 

 be more elongate than in the other species, its depth being about 

 one-sixth of the total length. The head is long, about one-fifth of 

 the total length, and flat above, the width of the interorbital space 

 being contained twice and two-tliirds in the length of the head. 



