of Edinburgh^ Session 1864-65. 393 
EoUs exigua. — A number were found on Laomedea geniculata upon 
Laminarian blades, cast on shore by an October storm. 
Eolis Rohertiance^ n. s. — Body three-tenths of an inch long, rather 
stout, and of a prevailing orange-red hue ; granular, with a few 
paler spots. Dorsal tentacles extremely attenuated, long, linear, 
smooth, orange-red. Eyes very distinct, set in a pale yellow space 
at the base of the tentacle posteriorly. Oral tentacles shorter, linear, 
similarly attenuated, orange red, and proceeding from the angles of 
the lip. Branchiae thick, rather swollen, elongated, tipped with 
deep orange-red, which likewise passes down the sides ; the base 
paler orange. They were incomplete in the specimen, but appeared 
to be set in nine or ten transverse rows, leaving a considerable 
space in the centre. The first row comes nearly as far forward as 
the dorsal tentacles. Foot orange yellow, rather suddenly tapering 
to a short tail. Jaws of a pale straw colour ; lingual plates somewhat 
like those of E. tricolor, and stouter than in E. Farrani. From 
the border of the laminarian zone during a spring tide. 
Note on the Polyps 0/ Alcyonium digitatum. 
The varied descriptions and figures of these common polyps pro- 
bably arise from the changes which so readily ensue on removing 
them from their native sites in the usual manner. The figure 
given by Ellis,* though not accurate, shows a closer approach to 
the natural aspect of the tentacles than Dr Johnston’s,f and the 
same may be said of Muller’s.| Dr Johnston is correct enough in 
his description, so far as it relates to faded and sickly specimens 
brought from deep water by the fishermen. Sir J. G-. Dalyell§ is 
somewhat more exact in his description of the tentacula and gene- 
ral appearance, but his figure does not represent the polyps in 
perfection. 
The most perfect specimens are got amongst the rocks at low 
water, under stones in pools. Small patches can be chipped off, 
adhering to a fragment of stone, without injury ; and taking one 
of these, three-fourths of an inch in diameter, it is found that the 
^ The Nat. Hist, of many Curious and Uncommon Zoophytes, 
t British Zoophytes, p. 177. Plates xxxiv. and xxxiv^^ 
J Zool. Danica. Tab. Ixxxi. 
g Bare and Remarkable Animals, &c., vol. ii. p. 176. Plate xlvii, 
3 F 
VOL. V. 
