436 Mr. A. Alcock on undescribed Shore-Fishes 
of the maxilla is nearly ^ that of the head. Teeth numerous, 
close-set, even, acute, uniserial, in both jaws. 
Gill- membranes united ; gill -rakers few, short. Scales of 
moderate size, adherent ; thick and strongly ctenoid on the 
coloured, cycloid on the blind side. Lateral line with a 
supra-pectoral curve ; its scales small and faintly bilobed. 
The longest dorsal rays, which exceed the corresponding 
anal rays, are J the body-height. Paired fins much more 
developed on the coloured side, where the pectoral has its 
upper rays prolonged equal to ^ the length of the body 
measured without the caudal. 
Colours in life : — Left side brown, with irregular black 
blotches, the three largest of which are on the lateral line, 
while the others form a series round the body ; several trans- 
verse series of deep blue spots in the interorbital space ante- 
riorly ; right side with a transverse black band behind the 
mouth and with a number of indefinite dark blotches arranged 
in a large triangular patch in the middle of the body. 
Total length 3*75 inches. 
Off the south-east coast of Ceylon, 32 fathoms, as above. 
This species is closely allied to the next preceding, and the 
single specimen appears to be a male. 
At several stations off the Ganjam coast there have been 
taken some curious dwarf Pleuronectids which, in consequence 
of their diminutive size and the transparency of their tissues, 
one is at first inclined to regard as either larval or stunted 
forms. But in the relative proportions of the body, in the 
completed asymmetry (shown in the unilateral disposition of 
the eyes, the unilateral restriction of pigment, and the slight 
unilateral atrophy of the paired fins), in the perfect ossifica- 
tion of the skeleton, and in the character of the vertical fins, 
one sees indications of development sufficiently advanced to 
permit of tolerably accurate generic and specific discrimina- 
tion. The outline of the body is like that of Rhombus , bat 
more circular; the nature of the mouth and dentition and the 
disposition of the eyes are similar to Rhomboidichthys. 
Psettyllis, gen. nov. 
Allied to Rhomboidichthys ? 
Body subcircular. Jaws and dentition symmetrical ; mouth 
very small, the length of the maxilla being less than one 
fourth that of the head ; teeth minute, in the jaws only. 
Eyes on the left side, separated by a broad concave space. 
