ig6 Ihc Irish Naturalist. August-September, 
The radula shewed the usual variations due to growth. 
In a specimen 6 mm. in length, it was made up of 26 rows 
with 50 uncini on either side of the widest row ; in one of 
of 20 mm. it had 38 rows with up to 70 uncini in each 
half of the widest row. The mandible -edges were armed 
with from 4 to 5 rows of tubercular teeth. 
Doris testudinaria (Aid. & Hanc.) 
Two specimens of this species occurred to me under stones 
at low- water mark, Skerries, in July of the present year. 
When in motion the animals measured respectively 50 
mm. X 25 mm. and 65 mm. x 32 mm., with a height ranging 
from 10 to 12 mm. Compared with other Dorids, they were 
very active, progressing with a beautifully smooth, gliding 
motion, unaccompanied by the slightest undulation of the 
cloak margins, at the rate of fully 66 mm. or rather more 
than 2\ inches per minute. 
Both specimens agreed well in form and colour with the 
large Plymouth specimen (A.) described by Sir C. Eliot at 
p. 102 of his Supplement to Alder and Hancock's Monoo^raph, 
but the underside of the Skerries specimens were not white, 
but a rich yellow. A hasty dissection of one of the specimens 
showed that it was destitute of labial armature, that the 
fragile, colourless radula had about 28 rows of teeth, that the 
minute otoliths numbered about 60 and that the cloak was 
stiffened by densely set granules and straight rods. 
The larger specimen laid a small spawn coil in captivity, 
and two other and much larger coils were found aloligside 
the animals when taken. Comparison of these with the 
smaller coil showed that they belonged to the same species. 
All three coils were of a dull cream colour : they were fixed 
by the edges and formed a frilled spiral similar to the coil 
of Archidoris tuber culata. The eggs were thickly and 
irregularly disposed in the ribbon, and the embryos in each 
egg were usually 2 in number though frequently 3 or i. 
The largest coil when opened out and laid flat measured 
290 mm. X 14 mm., and a careful estimate, made by the 
method here described in the case of Archidoris tuhcrculala , 
gave a total of fnlly 480,000 embryos for the whole coil. 
