162 
The Irish Naturalist. 
August-September, 
Lambay, and at Dalkey the coast is rocky and in parts 
precipitous ; large oozy creeks or inlets are found at Rogers - 
town, at Baldoyle and at Malahide, and extensive sandy 
tracts are laid bare at low water at Portmarnock, at Port- 
rane, and on the inner shores of Dublin Bay north and south 
of the Liffey mouth. The range in latitude of the area is 
barely 30 miles. 
The most interesting of the Dublin dredging grounds, 
having regard to the rarity of the species yielded and to 
the narrow limits of the area, is the Malahide River, as the 
channel is called by which the large Malahide creek or 
lagoon is alternately filled and emptied at the rise and fall 
of the tide. This is the locus classicus of Proctonotus mu- 
croniferus, Favorinus albus and Galvina Farrani which were 
first made known to science from specimens taken here in 
1844 by Joshua Alder, one of the authors of the famous 
Monograph of the British Nudibranchiate Mollusca, while 
dredging with Dr. Farran. In addition to these, the 
following species have been taken in the Malahide River, 
making up a total of 26 members of the Nudibranch group 
for this restricted area of a few hundred yards of narrow 
estuary varying in depth from i| to 2 fathoms : — 
Elysia viridis. Dendronotus frondosus, 
Limapontia capitata. Archidoris tuberculata. 
Eolis papillosa. Aegires punctiluccns. 
Amphorina caerulea. Polycera Lessopii. 
A. aurantiaca. P. quadrilineata. 
Galvina picta. Acanthodoris pilosa. 
Coryphclla Landsbergii. Lamellidoris aspcra. 
Favorinus Drummondi. L. bilamcllata. 
F. coronata. Adalaria proxima. 
Antiopa cristata. Goniodoris nodosa. 
Doto coronata. G. castanca. 
Ancula cristata. 
Of the species recorded for Malahide River, one, Adalaria- 
proxima, has here its only Irish station so far as our present 
knowledge of the Irish Nudibranch fauna extends. 
Two other dredging grounds on the Dublin coast, one in 
the south, Dalkey Sound and its immediate vicinity within 
a mile radius of the little harbour of Coliemore, the other 
