430 PLAGIOSTOMATA OF THE PACIFIC, 



the pectorals, the second back of the first dorsal, and in front of 

 the ventrals, spreading laterally near the abdomen. The snout 

 and cheeks are shaded also with darker brown cloudings. Small 

 pale brown dots besides the above cover the- back of the head and 

 body ; and about one-half of the pectorals, dorsals, and caudal 

 ventrals, anal and lower lobe of dorsal of a more uniform brown. 



"Sa-siwari" of the Japanese, common in Spring and Autumn, 

 and much sought after for food." 



The specimen which we have now figured and described, is a 

 female of 16 inch in length, or about half grown. In marking as 

 we have previously observed it is distinct from all its congeners, in 

 general aspect it much resembles H. Phillippi, the species with 

 which it has always been confounded, but in its dentition it comes 

 nearest to H. Francisi, differing however from it considerably in 

 the 5 cuspid middle teeth. 



The number of known species of Heterodontus now amounts to 

 five, distributed as follows : — 



North Pacific Ocean, East or American side, Heterodontus 

 Francisi, San Francisco. West side, China and Japan, Hetero- 

 dontus Japonicus, Japan. South Pacific Ocean, West or Australian 

 side, H. Phillippi and galeatus, Sydney. East or American side, 

 H. Quoyi, Galapagos Islands. 



Dr. Bleeker seems to have found a species in the Indian Ocean, 

 which he at once set down as H Phillippi. It is not at all 

 improbable however, that it may be distinct, or that it is identical 

 with the Japanese Fish ; indeed it is most unlikely to be H. 

 Phillippi^ a species which seems to have only a limited range in 

 a direction 1ST. of Sydney, not being known on the Queensland 

 Coast, while it extends to the South as far at least as the mouth 

 of the Derwent in Tasmania. 



We may note here that H. galeatus Gunth. regarded when we last 

 wrote as so rare, has been got frequently of late years, its rarity 

 arising probably more from the ignorance and want of observation on 

 the part of the fishermen, than the actual paucity of its numbers. 

 Echini form the chief food of this species and probably of all the 

 genus, the strong dorsal spines and prominent supraorbital ridges 



