391 
of Edinburgh, Session 1861-65. 
to above half tide mark, apparently delighting in dark surfaces 
whose tints closely resemble its own. They were met with several 
times in groups. punctilucens lives well in captivity, and it 
spawns in July. 
Polycera quadrilineata was first found at St Andrews by Dr John 
Eeid in the month of September. It is occasionally got after 
October storms, and at low- water mark during the same season. 
They also spawn at that time. 
Polycera ocellata is gregarious amongst these rocks ; very active 
in confinement ; apparently phytivorous. Spawns in September, 
and sometimes the ova are deposited on the surface of the water in 
an incomplete coil. 
One young specimen of Polycera Lessonii occurred after an Oc- 
tober storm on a laminarian blade covered with L. geniculata. 
Ancula cristata is rather a common Nudibranch, living under 
stones in quiet pools between tide marks, sometimes in groups of 
three. The majority of the specimens are pale. They spawned 
in August. 
Tritonia Hombergii comes occasionally from the deep-sea fishing. 
In the stomach of one, about 3J inches long, were fragments of 
the usual food (Alcyonium digitatum), mixed with darker debris, 
possibly from Amphitrite tubes. 
Tritonia pleheia, very abundant on Alcyonium digitatum (on 
which it probably feeds), cast on shore by storms, on corallines 
from deep-sea fishing, and procured by the dredge off the lami- 
narian zone. Twice were full-grown specimens got in autumn, 
having a remarkable process on the left side, about the last bran- 
chial appendage ; indeed, the tail seemed bifid. 
Dendronotus arhorescens generally comes from deep water in the 
fishing-boats, or from debris of storms. Dr John Eeid first pro- 
cured it at St Andrews. None were ever heard to emit the sounds 
mentioned by him and Dr G-rant. 
Doto fragilis . — Specimens occur on corallines from deep-sea 
fishing. They are rarer than the succeeding species, and generally 
larger. 
Doto coronata. — Abundant in the same regions as the former 
and also under stones in rock pools. One showed a curious ab- 
normality in the left dorsal tentacle. 
