by C. Tate Regan. 203 
A single specimen, 130 mm. in total length, collected by Mr. H. W. 
Bell Marley. The long preorbital and preopercular spines distinguish 
this species from its nearest allies, A. tenianotus, Cuv. & Val. and 
A, crista-galli, Ginth. 
Family BALISTIDA. 
Monacanthus melanocephalus, leek. 
Family TETRODONTID &. 
Tetrodon pleurospilus, sp. nov. 
Length of head 34 in length of fish. Lower teeth 3 as broad as 
upper. Nasal tentacle bilobed, apparently formed as in 7’. palembang- 
ensis. Eyes above level of mouth. Diameter of eye nearly 4, 
interorbital width a little more than } length of head. Body smooth 
except for a patch of spines on abdomen, extending from below the 
eyes to within a short distance of the vent. Dorsal with 9 rays, anal 
with 7, pectoral with 15. Caudal subtruncate, its posterior margin 
slightly convex. Back brownish, abdomen white; sides with dark 
spots forming about three irregular longitudinal series, the spots of 
the lowest series confluent anteriorly to form a stripe from mouth to 
lower end of base of pectoral. 
A single specimen, 200 mm. in total length, from Durban, collected 
by Mr. H. W. Bell Marley. 
Family DIODONTID A. 
Diodon orbicularis, loch. 
Family CYNOGLOSSID A. 
Plagusia robinsoni, sp. nov. 
Depth of body 34 in the length, length of head 3°. Snout obtusely 
pointed, nearly 4 length of head. Eyes one diameter apart; 3 of 
upper in advance of lower; diameter 14 in length of head. Angle 
