389 
of Edinhurgliy Session 186i-65. 
Doris Johnstoni is somewhat scarce, and generally in company 
Avith the former under stones between tide-marks. This species 
does not sport in tint. It is an active animal in confinement. The 
same species of Ergasilus occurs on this Doris as on the former. 
Largest specimen, inches. 
Doris repanda is one very commonly found at all seasons amongst 
the rocks. The largest specimens are often of a dusky yellow tint. 
Many had the border of the cloak injured, as if a portion had been 
eaten out. It is very tenacious of life in captivity. Two kept for 
some time in a vessel along with a little Corallina officinalis de- 
posited their ova ; and this being one of the few species that 
Messrs Alder and Hancock had not observed at the breeding season, 
nor yet succeeded in obtaining its spawn, a more detailed account 
will be given. 
On the 10th of November, the two were observed in coitUj and 
apparently in a state of excitement, elevating the cloak all round 
the margin in a curiously frilled manner. They lie head to tail, 
hut not very closely, and the intromittent organ is capable of great 
extension and distension, so that the animals are enabled to effect 
their purpose, even when one is lying at right angles to the head 
of the other. On the 12th they were both in process of depositing 
their spawn on the side of the glass. The coil is a simple one, 
attached by the edge, and sloped upwards and inwards. The eggs 
are very large and conspicuous. 
In spawning, the body is shortened ; the posterior edge of the 
cloak being doubled inAvards, so as to press on the outer edge of 
the coil of ova. The upper (left) edge of the cloak is raised from 
the surface and arched in a graceful manner. The anterior border 
is spread out and flattened on the surface of the glass, and the fore 
part of the foot is likewise similarly fixed. In the centre of the 
coil of spawn, the foot was bent upon itself, causing a deep dimple, 
and this hollow remained although the animal changed its position. 
As the act of deposition proceeded, it glided the anterior (attached) 
extremity upwards, while the posterior (free) turned downwards, 
thus favouring the gradual exit of the coil. The anterior part of 
both foot and mantle constituted a broad pivot on which the animal 
revolved from right to left. The posterior border of the mantle 
did not always remain alone at the outer part of the coil, for by 
