90 
SPOLIA ZEYLANICA. 
Diaulula sp ., juven. 
One specimen from Trincomalee. When alive it measured 14 mm. 
in length and. 9 mm. in breadth. The colour was translucent white, 
but the viscera showed dark through the body wall, and on the white 
ground were a small number of scattered white spots. With the 
aid of the microscope it could be seen that the whole upper surface 
is peppered with minute black spots. 
The back is hispid, being covered with minute white papillae, from 
which project tufts of spicules. The foot is deeply grooved in front 
and notched. The oral tentacles are long and thin. The rims of 
the rhinophorial and branchial pockets are slightly and evenly 
raised. The branchiae appear to be 5. 
The buccal parts are protruded. On the labial cuticle are dark 
patches, but nothing that can be called an armature was found 
under the highest power. 
Only 11 rows (? all) were found in the radula, with a formula 
of about 31 0‘31. All the teeth are simply hamate, but whereas 
the first 15 or so are small and low, the rest are tall and stout. The 
outermost tooth is slender, but not much degraded. 
The penis appears to be armed with scales, but no spines were 
found. 
The specimen does not fit conveniently into any recognized genus, 
and belongs to a group of Do rids which are difficult to classify, 
namely, those with papillate back, and no very decided peculiarities 
in the internal organs. As the present specimen is almost certainly 
immature, it does not seem desirable to make it the type of a new 
genus. Among existing genera it comes as near to Diaulula as 
any other. 
Hallaxa decorata (Bergh). 
See Bergh, in Semper’s Reisen Heft. XIII., pp. 572-4. 
The name Halla , given by Bergh to a genus of nudibranchs in 
1878, was already in use for a Polychset worm, Halla parthenopeia, 
A. Costa, 1844,* and must therefore be altered. It is suggested that 
it should be replaced by Hallaxa. 
Three specimens without notes, but in a bottle, whose contents 
come from Trincomalee. The largest is 14 mm. long and 9 broad ; 
all are flat and soft, with an ample mantle margin. 
The colour produces an impression of dark bluish gray or indigo, 
but under a lens is seen to be due to a complicated system of 
markings: (1) the ground colour is formed by mottlings of grayish 
purple, varying in intensity ; (2) over these mottlings are scattered 
numerous dark brown or black dots ; (3) there are also round spots 
* See A. Costa in Ann. Accad. d. Aspirant! Naturalisti Napoli, II., p. 63, 
1844. 
