202 
The Irish Naturalist* August-September, 
which is closely similar in aspect to Lamcllidoris aspera 
though quite distinct in the form of its radula. Originally 
placed under Doris by Alder and Hancock, it was made 
the type of a new genus, Adalaria, by Bergh in 1878 : 
Colgan '13. 
The radula of this specimen was found to be made up of 
40 rows with from 8 to 9 lateral plates in each half row 
in addition to the large lateral spine. 
Lamellidoris aspera (Aid. & Hanc.) 
Doris aspera. 
In dredgings and between tide-marks, rather rare. 
" Mr. Alder procured specimens during an excursion in: 
December last with Dr. Farran of Dublin, to Malahide " : 
Thompson '44. Two specimens at Lambay (H. J. B. 
Wollaston) : Colgan '07. One specimen in 8 f. Dalkey 
Sound and another in 9 f. off Bullock : Colgan '08 and '09. 
One specimen in 9 f., Dalkey Sound, 1906 ; i at low water 
Sandycove, 1909 ; i in Malahide River, 2 f., 191 1 : and 
2 off Bullock in 10 f., 1911-12 : N.C. — Largest 8 mm. long. 
L. bilamellata (Linne). 
Doris bilamellata. 
Rather common in dredgings and between tide-marks. 
Between tide-marks on Lambay : Thompson '40A. In 
great abundance at Williamstown above low water 
mark : H assail '42. Very abundant on stones, old 
shells, and boot -soles in 13 f. off the north side of Howth 
Head : Colgan '08. Abundant, chiefly on old Lutraria 
valves, in 5 f. off Skerries, where 47 specimens were taken in 
a single haul in July, 1907 ; also found abundant a few days 
later on flat stones at low water, Shennicks Island,. Skerries, 
where as many as 15 juveniles were taken on one small 
stone ; one specimen in 2 f., Malahide, 1908 : N.C. — 
Largest 19 mm. long. 
When dredged this species was usually found arranged 
in close groups of 3 or 4. The coh^ur is usually brownish, 
