/9. occipital process triangular with straight 



sideborders A. goniaspis p. 283. 



B. Teeth in two groups J ). (Pseudarins Blkr.). 



1. teeth in the upper jaw in a band, at least 



6 times as long as broad A. maculatus p. 284. 



2. teeth in the upper jaw in a band, 3 times 



as long as broad 4. microcephahis p. 285. 



II. Teeth on the palate villiform, or conical and pointed. 



A. Teeth in three groups on each side, forming a 

 large triangular patch with the base anteriorly 



(Netuma Blkr.) A. thalassinus p. 286. 



B. Teeth in two groups on each side in a transverse 

 row. (Hexanematichthys -f- Hemiarius Blkr.). 



1. outer groups triangular with emarginate 

 hindborder, greatly exceeding in size the 



very small contiguous inner groups A. gagorides p. 288. 



2. outer groups rounded or oval, larger than 

 fhe inner groups which are generally distant. 



a. occipital process hemispherically rounded A. sagor p. 289. 

 l>. occipital process more or less triangular. 

 a. base of adipose fin longer than that 

 of dorsal, twice or less in its distance 

 from that fin. 

 a'. Dorsal spine as long as head from 



nostrils A. stormi p. 291. 



(3'. Dorsal spine as long as postorbital 

 part of head 2 ). 



a 1 . Head 4~4 2 /3 in length. Pectoral 

 spine as long as head without 



snout, longer than dorsal spine A. carinattts p. 292. 



'. Head 3 in length. Pectoral 



spine shorter than half head 



and shorter than dorsal spine. 



a 2 , eye Q 1 ^' 11 '^ in head, base 



of occipital process 2 / 3 of 



its length A. nudidens p. 294. 



<5' 2 . eye 6'/ 4 , base of occipital 



1) In using this table one ought to remember that in some cases the anterior patches of teeth 

 on the palate may be rudimentary or the teeth nearly wanting, with the result that there seem to 

 be only two patches in all. 



2) In young specimens of A. iiudidens the dorsal spine is i eye-diameter longer. 



