294 Records of the Indian Museum. [Vot,. XII, 1g916.] 
Apart from sexual dimorphism no salient anatomical feature has 
been stated in the description of P. dayi save the reduced number 
of scales on the lateral line mentioned in the above key to the 
species. 
History.—McClelland in 1839 founded the genus 4 plocheilus, 
in which he included the two Indian species melanostigma and 
panchax. In 1846 Valenciennes made Panchax a generic name and 
included under it the species panchax and lineatum. T,ater Bleeker 
distinguished the two genera, restricting the genus Panchax to those 
species possessing vomerine teeth and the genus Aflochetlus to 
those destitute of them. Giinther protested against this differ- 
entiation and included all the known species under the genus 
Haplochilus, on the ground that ‘‘ the vomerine teeth of panchax 
are minute and rudimental, not offering a character on which a 
genus may be founded. In one out of three specimens they are 
entirely absent.’’ Day stated that the latter statement was 
not true of his numerous specimens. No such variation is shown 
by the species I have examined. ‘Tate Regan in the paper cited 
above remarks that vomerine teeth are not invariably present in 
Panchax, probably on the authority of Giinther. At least so far 
as Indian species are concerned, vomerine teeth are always present. 
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