34 ! The Irish Naturalist. February, 
These two species, which in general aspect are closely 
similar, are figured by their authors on the same plate 
(Plate 9, Family I.) of the " Monograph of the British 
Nudibranchiate Mollusca " and farther on in the same 
work an excellent drawing of the radula'^;is given in Plate 
46 — Tongues of the Dorididae. In describing D. proxima 
the authors suggested that the very marked character of 
the radula, which at once separates this Dorid from D. 
aspera, might be held by some naturalists to justify its 
reference to a distinct genus. This suggestion has since 
been acted on, Bergh having in 1878 in Vol. ii. of Semper's 
" Reisen im Archipel der Philippinen " (Malacologische 
Untersuchungen, Heft xiv.) founded the new genus Adalaria 
on the Doris proxima of Alder and Hancock. In addition 
to the type species Bergh's genus includes A. Loveni, on 
record for Bantry Bay and the coasts of Norway and 
Sweden, and three Northern Pacific species, A. virescens 
Bergh, A. pacifica Bergh, and A. alhopapillosa (Dall). As 
to the systematic position of Adalaria, Eliot places it between 
Acanthodoris and Lamellidoris in his division Pseudo- 
dorididae of the Phanerobranch Dorids. This division 
•is restricted to temperate seas, and to it is probably referable 
the only known instance of a fresh-water nudibranch, 
Ancylcdoris haicalensis from the Siberian Lake Baikal. 
In the text to their plate 46 Alder and Hancock state 
that the radula of Doris proxima has no central plate. 
In the radula of the Malahide specimen, however, a few 
small, flat, centrally-grooved median plates were detected 
at the anterior end. Although the number of the lateral 
uncini was in places difficult to make out owing to the 
small size of the extreme inner and outer members of the 
row, the lingual formula was clearly the same as that given 
by Sars in his " Mollusca Regionis Arcticae Norvegiae, " 
i.e., lo-I. I. I-io., the large numerals here representing 
the conspicuous hooked laterals, one on each side of the 
median line. In his Plate XIV., fig. ib, Sars gives a figure 
of the radula of Doris Loveni where the median tooth or 
plate accurately represents the form of the corresponding 
plate observed in the Malahide specimen of D. proxima. 
The fact is that the median teeth are really present in both 
