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PACIFIC SCIENCE, Vol. IX, July, 1935 
canthus , and Atulonotus , the latter being erected 
for the species Naso hexacanthus (Bleeker) and 
Naso vomer (Klun zinger). He distinguishes 
Atulonotus from Axinurus by its possession of 
two instead of one plate on each side of the 
caudal peduncle, teeth with serrate edges; from 
Callicanthus by the presence of pointed teeth 
and from Naso and Cyphomycter by the lack of 
a conical frontal horn or swollen region at all 
stages. As previously discussed, the number of 
caudal plates and the presence or absence of a 
prominence on the forehead are not, in my 
opinion, characters of generic magnitude in the 
Naso group. Even dentition does not provide a 
consistent basis for separation. The teeth of 
Naso unicornis , although usually serrate, may be 
smooth, as indicated in Plate 3, Figure 1 of 
Aoyagi (1943). Therefore I leave Naso un- 
divided and place Atulonotus in synonymy. 
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