viii A MONOGRAPH OF THE 



tentacula four, of which the first pair are very long, setiform, and extended forward ; the other 

 pair are remote, short, and erect : eyes two, small and black, situated at the base of the 

 hindmost tentacula : on the right side near the eyes is a cluster of short cirri ; and at a little 

 distance from these commence four series of longer ones, of a pink colour, spotted with white, 

 standing transversely, and extending down the sides ; these cover the middle of the animal ; 

 the other parts are yellowish- white tinged with pink about the eyes. Length half an inch/' 



(21) Eolis Drummondi. 



We found a remarkable variety of this species in the Menai Straits, opposite Bangor, 

 with the branchiae of a sage-green colour : of this, two specimens occurred. Others in the 

 same locality had these organs of a brownish-drab. E. Drummondi is subject to great variety 

 of tint in the colour of the branchiae, but so great a variation of colour as from a reddish to a 

 greenish hue we were not prepared to expect. 



(22) Eolis Landsburgii. 



? Doris pedata, Mont., in Linn. Trans., v. 11, p. 197, pi. 14, fig. 2. 

 Additional Habitats. Hilbre Island, Mouth of the Dee, I. Byerley, Esq. Exmouth, Rev. T. Hincks. 

 Island in Menai Straits, Miss Hughes • also dredged in the Straits, J. A. Burghead, Elgin, Geo. 

 Murray, Esq. 



An opportunity of seeing fine full-grown specimens of this lovely Eolis enables us to say 

 that our drawing represents the species in a rather immature state. The branchiae in adult 

 specimens are longer and rather more numerous than there represented. The animal attains 

 the size of nearly half an inch. We are now disposed to think that this species may possibly 

 be the Doris pedata of Montagu, whose description agrees pretty well with our animal, though 

 the figure is anything but a good representation of it. 



(23) Eolis alba. 



Eolis alba, Loven, Ind. Moll. Scand., p. 8. 

 Additional Habitats. Falmouth, W. P. Cocks, Esq. Ardrossan and Saltcoats, Ayrshire; and 

 Lamlash Bay, Arran, /. A. Burghead, Elgin, G. Murray, Esq. 



This species is liable to curious variations of colour, becoming sometimes so dark as 

 almost to render the specific name inappropriate : the prevailing colour, however, is usually 

 white. In June, 1847, we got, among the rocks on the north side of Lamlash Bay, two re- 

 markable varieties. The branchiae in one were darkish purple-brown with white spots, and 

 in the other yellowish-brown, also spotted with white ; in both the body had transverse bands 

 of brown at the sides, which were united in pairs dorsally, so as to form loops round the base 

 of each cluster of branchiae : a dark brown band extended across the back opposite the first 

 row of papillae. The oral tentacles were not much longer than the dorsal pair, and these 

 latter had two bulbous swellings, the one half-way up the dark part of the tentacle, and the 

 other at the top of it. The largest individual measured three quarters of an inch ; it had one 



