92 
SPOLIA ZEYLAXICA. 
The labiaKarmature is dark purple and of unusual appearance, 
being arranged in regular rows like a radula. It is formed of short, 
bent, bifid rods, which stand up exactly like the teeth of many 
Chromodorids. It really forms a complete circular band, but there 
is an apparent interruption, as at one point the rods, though present, 
are colourless. This armature must have much the same action as 
a radula, and this is perhaps the reason why the real radula is minute. 
It is composed of 40 rows, which contain about 35 extremely small 
yellowish teeth on either side of the rhaehis. There are traces of 
triangular thickenings on this latter. The first laterals are broad 
and denticulate on both sides. The second and third are also broad 
but denticulate only on the outside. The rest are erect with 
hamate tips, and bear under the principal hook 5-8 denticles. 
Near the end of the rows the denticles are fewer and situated chiefly 
on the apex of the teeth. 
The central nervous system is very large. All the ganglia (in¬ 
cluding the olfactory and buccal ganglia) are large, round, and 
distinct. 
Ghr. flammulata, Bergh, and Ghr. lactea, Bergh, are perhaps both 
colour varieties of this species. In the former the red border of the 
back deepens to black or brown at its inner edge, and in the latter 
the border is altogether absent. 
Ghromodoris preciosa (Kelaart). 
Kelaart I., p. 295 ; Eliot I., pp. 642-3; for Ghr. flammulata and 
Ghr. lactea see Bergh, Siboga Expeditie, 1905, pp. 151-2, 159-60. 
Three specimens from Trincomalee. Dr. Willey’s notes on the 
living animals say “ Small white Chromodorids. Foot extended 
behind mantle in crawling. Crimson border, followed by a yellow 
sub "marginal border. A few obscure spots on dorsum. Red 
rhinophores and red gills. In one specimen the rhinophores and gills 
are black.” 
As preserved, the integuments, rhinophores, and branchiae are 
all white. The largest specimen is 10 mm. long and 5 5 broad. 
The mantle is ample, and expanded over the head and tail. 
The labial armature is very regularly arranged as in Ghr. fidelis, 
but still conforms to the normal type, and the elements which are 
bifid rods do not stand erect. It must be remembered, however, that 
this organ in Ghr. fidelis is described from a single specimen, and that 
an examination of others might show the existence of variation. 
It forms in Ghr. preciosa an incomplete circle, and the interruption 
appears to be real, not an appearance produced by change of colour. 
The teeth are much as in Ghr. fidelis , but the denticles are coarse^ 
and more distinct. 
Kelaart appears to have thought that Ghr. fidelis and Ghr. preciosa 
resembled one another, though the similarity is not very apparent 
