LATERAL LINE SENSORY CANAL SYSTEM IN CYNOGLOSSUS SEMIFASCIATUS DAY

Abstract

This paper gives an illustrated description of the normal lateral line
sensory canal system in Cynoglossus semifasciatus D?y, and also of certain
abnormalities noticed in the species, with a special reference to certain cases
of partial ambicolour?tion and albinism.
Eight sensory canals are noticed in the species. These are: the cephalodorsal,
the dorsolateral, the supra-orbital, the mediodorsal, the pre-orbital,
the pre-opercular and the mandibulo-opercular lines and the supra-orbital
commissure.
The main abnormaUties that were noticed related to: (1) the occiu*-
rence of breaks in the course of the canals with or without the extension of
the broken ends, (2) growth of offshoots, extension of canals beyond their
usual end limits and various combinations of these, (3) absence of the preorbital
line and the shortening of the cephalo-dorsal and the supra-orbital
.lines.