1914' CoLGAN. — Ophthohranch Fauna of Co. Dublin. I99 
at Rod Island, July, 191 j ; two specimens each j8 mm. 
long at low water, Bullock, May, 1913, on Halichondria 
panicca and closely assimilating with the sponge in colour 
and texture : N .C. 
On dissection, two specimens; one 15 mm., the other 
JO mm. long, gave radulae with 15 and 20 rows respectively, 
the laterals on either side of the widest row numbering 20 
in the smaller, and 27 in the larger specimen. 
Aegires punctilucens (d'Orbigny). 
In dredgings, rare. Two specimens taken in 1907, one 
in November in 2 f. in Malahide River, another in December 
in 10 f. off Bullock : Colgan, '08. There is a specimen 
in Dublin Museum collected by R. Hanna at Howth in 1898: 
Nichols, 1900. One specimen 20 mm. in length taken in 
2 f. in Malahide River, December, 1912 : /. Bay ley Butler. 
One specimen in 5 f. off Kingstown Pier, May, 1914: N.C. 
This is a very sluggish animal in captivity. I have 
seen it remain motionless for two hours with rhinopliores 
and branchial plumes fully extended, and the fastest rate 
of progression observed was one inch in 3 minutes. The 
radula in a mature specimen had 21 rows of teeth with about 
20 uncini on either side in the widest row. 
Polycera quadrilineata (Miiller). 
Locally frequent betw^een tide -marks ; occasional in 
dredgings. Malahide and Dublin Bay : A. & H. Mono- 
graph, 1851. Salthill: Haddon, '86. Off Howth, 4 f. : 
Nichols, 1900. Betw^een tide-marks off Shennicks Island, 
Skerries, 29 specimens, the largest 25 mm. long in motion, 
were taken in 9 gatherings on Zostera, Fucus serratus, and 
Chorda filuni in the month of July, 1907, 1910, and 1913 : 
N.C. 
In only 2 of the Dublin specimens was any tendency 
observed to assume the black lineations which are usually 
borne by this species in the Kieler Bucht. These two 
specimens, taken at Skerries, were dotted and streaked 
all over the body with minute black markings which did 
