LN. NOLES ON-NUDIBRANCHS £ ROM 
Her OND), ACN M U:S- EU Me. 
By Sir CHARLES Eviot, K.C.M.G., F.Z.S., Vice-Chancellor 
of the University of Sheffield. 
The following notes deal with some nudibranchs kindly sent 
to me for examination by Dr. N. Annandale, Superintendent of the 
Indian Museum, Calcutta. Many of the specimens are of some 
age and so discoloured and distorted that it hardly seems profitable 
to describe them. They indicate, however, that the genus Pleuro- 
phyllidia (or Linguella) is abundant in Indian waters. The speci- 
mens noticed here are in good condition, and the characters of the 
new species appear to be certain... Both these species are connect- 
ing links which bridge over the differences dividing recognized 
genera, and indicate, like so many nudibranchs discovered in the 
last decade, that these genera have been too rigidly defined. 
The collection also contains specimens which, though in a 
poor state of preservation, appear to belong to Pleurobranchea 
morula, Bergh. ‘This form also is of interest as a connecting link, 
for though it has most of the characters of Pleurobranchea, the 
dorsal parts are clearly separate from the foot and overhang it, 
much as in Pleurobranchus. 
The species described below are :— 
H 
Linguella quadrilateralis, Bergh. 
Cuthona annandalet, sp. nov. 
Thordisa annulaia, sp. nov. 
Doris (Staurodoris) pustulata, Abraham. 
Chromodoris albo-pustulata (2), Pease. 
iS) 
On —& Oo 
Linguella quadrilateralis, Bergh. 
See Bergh; Anat. Unters. af Sancara quadrilateralis, Naturh. 
Tidsskr., 1863, pp. 484—-538, and Malac. Unter. in Sempers Reisen, 
Heft vi, pp. 266—268. 
Two specimens from the Andamans, the largest 39 mm. long 
and 14 mm. broad. ‘The shape is squarish and clear-cut. The 
ground colour in both is brownish green, marked in one with light 
longitudinal lines, and in the other with small white spots, arranged 
in fairly regular rows. This variation between stripes or ridges 
and spots or tubercles arranged in rows is found in other Phylli- 
diidee. The rhinophores are whitish with green perfoliations. The 
lateral lamelle are whitish and about 30 on either side: in the 
