28 
NOTES ON NUDIBRANCHS. 
By B. STORROW. 
The following notes contain records of two species not 
before recorded for Xortlmmberland, observations of spawn- 
ing, localities where species are particnlarlj- abundant and 
a note on the white variety of Tritonia homhergii. 
Tritonia homhei-gii, Cuv. Tliree specimens of the white 
variety but with tiie typical dentition of honibergii have 
been obtained. One in February, 1910, picked up on the 
deck of a trawler which had been fishing to the east of 
Seaham, and two from 40 fathoms vS.E. of the Coquet. 
Dork tuherculata , Cuv. Is most abundant at Brown’s 
Point, Cullercoats, and the Crab Rocks, Whitley, where 
large over-hanging rocks are covered on the under surface 
with Halichondria. It is also to be found on the south side 
of Cullercoats Bay, St. Marj-’s Island, and amongst the 
rocks immediately to the south of St. Mary’s. The earliest 
dates when spawning was observed are 10th April, 1909, 
in the Laboratory, and cSth May, 1909, on the Crab Rocks. 
LameUidoris hilameUata (L). Is most abundant on the 
upper surface of fiat rocks at Brown’s Point and the Half 
Moon Rocks, IVhitley, in February and March. On 3rd 
December, 1910, numerous large examples were found at 
Brown's Point and some of these spawned in the Laboratoiy 
on 8th January, 1911. The earliest date when spawning 
was noticed to take place on the rocks was on the Half Moon 
Rocks on 12th February, 1910. Then the spawn and 
slugs were most plentiful on the seaward side of the rocks 
and occurred in smaller and smaller quantities as the cracks 
in the rocks were followed towards the shore. 
LameUidoris asjjera, A and H. Two specimens were 
obtained at St. Mary’s Island on 22nd March, 1910, and 
spawned in the Laboratory on the same day. Alder and 
Hancock give the spawning months as May, June, and July. 
