424 MONOGRAPH OF THE AUSTRALIAN MARSIPOBRANCHII, 



front, but terminate in a distinct though short posterior border; 

 the outer border of the anterior fin is evenly convex, its apical 

 portion l^eing situated above the middle of the base of the fin, 

 and the length of its base is from one-fourth to three-fifths in the 

 interdorsal space and 1 ^^^ to If in that of the second dorsal, the 

 outer border of which is also convex throughout, its aj^ex being a 

 little behind the commencement of the median third; its height 

 at the apex is one-fifth more than that of the first dorsal; the 

 leno'th of the tail behind the second dorsal is a little more, equal 

 to, or a little less than the base of that fin, which is entirely 

 sepai'ated from the caudal by an interspace, which is equal to 

 about two-fifths of the length of the latter fin; the caudal lobes 

 are subequal in height, but the lower extends forwards much 

 further than the upper; they are connected together around the 

 extremity of the tail by a low rayed membrane. Head and body 

 without series of conspicuous pores. Skin transversely plicated. 



Black or dark brown above, lighter below; upper surface of 

 head with a bluish, sides of head with a bronze tinge; lower 

 surface of head, throat, and pouch grayish-white. 



Breeding : — Unknown. 



Uses : — Similar to the other species. 



Distribution : — Having already shown that Castelnau's 

 Geotria australis belonged in truth to the preceding species we 

 are now reduced to a bare statement of the habitat of this 

 Lamprey in so far as it can be separated with certainty from 

 that of Velasia. 



Gray's type specimen is said by Dr. Giinther to have come from 

 the "Inkarpinki River, South Australia"; but I have not suc- 

 ceeded in finding the locality of any river with such a name, and 

 it must be remembered that throughout the British Museum 

 Catalogue "South Australia" is used to denote our entire southern 

 sea-board, and not restricted in the territorial sense which is 

 customary here; this, however, is in this case of little consequence, 

 as Count Castelnau informs us that Mr. Pain, by whom the 

 specimen was forwarded to the British Museum, had personally 



