170 ENDEAVOUR SCIENTIFIC RESULTS. 



several details, so I have redescribed them here ; the 

 accompanying figure represents the largest specimen, which 

 was trawled in Western Australian waters by the "Endeavour." 



Logs. — Between Cape Naturaliste and Geraldton, Western 

 Australia. 



Nine to twenty miles off Bustard Head, Queensland, 14-20 

 fathoms. 



Twenty-two miles S.W. of Double Island Point, Queens- 

 land, 29 fathoms. 



Specimens are in the Australian ^luseum collection from 

 Oottesloe Beach, Swan River, and Shark Bay, West Australia ; 

 and Moreton Bay, Queensland. 



Family MONACANTHID.E. 



Genus Cantherines, Swainson. 



Cantherines mosaicus, Ramsay & Ogilby. 



(Plate XXX vii., figs. 1, 2.) 



Monacanthus mosaicus (Ramsav & Ogilby), Waite, Mem. 

 Austr. Mus., iv., 1, 1899, p"^. 93, pi. xvii., fig. 1. 



Seven specimens, 87-413 mm. long, show that this species 

 alters considerably in form with growth. The body is 

 orbicular in the young, but becomes more elongate with age ; 

 the depth is 1-2 and 1-8 in the length to the hypural in the 

 smallest and largest specimens. A ventral expansion of the 

 abdomen is present in some of the youngest examples, but 

 is reduced in specimens 110 mm. long, and is almost lost in 

 the larger ones. The forehead is swollen in some of the 

 small specimens, making the snout more or less concave 

 above, but this character is variable. Finally the armature 

 of the dorsal spine is much stronger in the young than in 

 the adult, the four rows of spinules being minute in the 

 largest specimen. The figures on Plate xxxvii represent the 

 largest and smallest of the " Endeavour " specimens. 



Locs. — Shoalhaven Bight, New South Wales, 16-45 

 fathoms. 



Twofold Bay, New South Wales, 20 fathoms. 



Twenty miles south of Cape Everard. Victoria, 69 fathoms. 



East coast of Flinders Island, Bass Strait. 



Marsden Point, Kangaroo Island, South Australia. 



South-east of Flinders Island, South Australia, 37 fathoms. 



I have also seen a young specimen from Albany, South- 

 western Australia. 



