I9I3- CoLGAN. — Adalaria Proxima. 35 
Species though easily overlooked in D. proxima as might 
be expected from their description as given by Sars : 
Lamellae radulae medianac minimae et rudimentares non 
contiguae (p. 308). The number of transverse rows of 
teeth in the Malahide specimen was 42, and the median 
plates were apparently confined to the ant(5rior end, be- 
coming rudimentary or obsolete farther back. Bergh ^ 
in describing the Adalarian radula calls these imperfectly 
developed median teeth false tooth -plates (falsche Zahn- 
platte). 
As showing the difficulty of separating D. proxima from 
D. aspera^ to which it bears so marked a superficial resem- 
blance, it is of interest to note that Sars in his classical 
work just referred to (p. 308) states that the single specimen 
of D. proxima which he dredged off the Lofodens in from 
10 to 20 fathoms was labelled D. aspera by his father (the 
famous marine zoologist, Michael Sars). Anatomical 
examination, however, showed with absolute certainty that 
the specmien belonged to D. proxiwM, first described by 
.Alder and Hancock, and afterwards taken in Kiel Bay by 
Meyer and Mobius. The lingual formula for D. aspera 
it may be mentioned here is 2-L i. I -2. 
A careful search through the extant literature of the 
Irish Marine Mollusca shows that Adalaria proxima has 
not been previously recorded for Irish waters. \\'e ma}' 
safely then congratulate Professor Bayley Butler on this 
interesting addition to our Nudibranch fauna. The species 
appears to be confi.ned to the North Atlantic, ranging from 
Dublin northward to the Lofodens, and so far as I can 
discover its only British stations are the estuaries of the 
Mersey and the Dee, Puffin Island, Anglesea, and St. 
x\ndrews. Now that attention has been drawn to it, and 
the value of its lingual formula in distinguishing it from D. 
aspera has been pointed out the species will probably be 
detected in other Irish stations. 
I am indebted to Mr. A. R. Nichols for assistance in 
tracing the literature of the genus Adalaria. 
1 Gattungen der nordischen Doriden. Archiv fur Nahtrgeschichte, 
1879, P- 36. 
Sandvcove, Co. Dublin. 
