21 



tudinally striated, equal to diameter of eye. Movable spine, 

 articulated with terminal spine, more or less curved, to 1 1 mm. 

 long. Operculum oval, about '/g longer than high. Length of 

 postorbital part of head slightly less than half the distance of 

 the base of pectorals from hindborder of operculum. The 

 distance of the ventrals from the pectorals about equal to that 

 of the latter from the eye. Colour yellowish or brown, lighter 

 above; a dark streak beginning from snout running in the 

 middle of the height to base of caudal. Length 140 mm. 



Habitat: Pulu Weh!; Sumatra; Simalur!; Nias ! ; Batu 

 Islands; Java (Batavia); Flores!; Celebes (Makassar!, Menado !) 

 Saleyer ! ; Buton ! ; Sanghir Islands; Biaru Island ! ; Buru ; Ternate 

 Ambon!; Obi!; Halmaheira ; Banda; Aru!; Waigeu ! ; Goram 

 New Guinea. — Persian Gulf, Muscat (Regan), Philippines, 

 Japan, Riu Kiu Islands, Pelew Islands, Cape York, Solomon 

 Islands (Ogilby). 



2. Centriscus Linne. 



(LiNNK, Systema Naturae edit. X. 1753, p. 336). 



Aviphisilc Cuvier, Regne anim. II. 181 7, p. 350 p. p. 



Acentrachvie Gill, Proc. Acad. nat. sc. Philadelphia 1862, p. 204. 



Dorsal cuirass with only one unpaired plate situated behind 

 the fourth plates of the upper row and wedged in between 

 the fifth plates of that row. The dorsal cuirass terminates in 



Fig. II. Cenlrisciis scut at us L. 2/3 d- s- 



a long, strong spine, to which no separate dorsal spine is jointed. 

 Interorbital space with or without a groove, continued to the 

 crown of the head, which is striated and crenulated. 



Distribution: From Red Sea(?) and Madagascar through 

 Indie to Australia, Philippines and Southern China. 



Living in somewhat deeper water near shore. 



Key to the indo-australian species of Centriscus. 



I. Interorbital space with a groove continued to the crown 

 of the head ; sutures of lateral plates serrated. Postorbital 



