ATYLUS SWAMMERDAMII. 
247 
antennas are subequal, and about half the length of the 
animal ; the peduncle of the superior pair is scarcely more 
than half the length of that of the inferior ; the flagella 
of both pairs of antennae have the articuli nearly as 
broad as long, each articulus in the superior pair being 
furnished with a single hair, and one short auditory cilium. 
The first pair of legs are smaller than the second, but 
neither of them are very strong. The legs are rather 
short, and the three posterior pairs have the fingers 
generally directed backwards. The caudal appendages 
are nearly of the same length, the penultimate being a 
little the shortest; in the last both branches are of 
the same length, styliform in shape, and free from hairs. 
The central tail-plate is about as broad as long, some- 
what truncate, and cleft from the apex nearly to the 
base. 
This species is evidently the same as that described by 
Prof. Milne Edwards, from the coast of Morbihan. Spe- 
cimens have been sent to us from the Moray Frith, by the 
Rev. G. Gordon, in compliment to whom the species was 
named, previously to our ascertaining it to be identical with 
A. Swammerdamii of Milne Edwards. We have also taken 
it in Plymouth Sound. The specimen named Dexamme 
Louglirini in the “ British Museum Catalogue,” after Mr. 
Loughrin (in consideration of the services which he, a 
coast-guardsman of Polperro, had done for science in 
collecting marine animals), was taken in the rock-pools 
at the mouth of that harbour, where the shore suddenly 
dips into many fathoms of water. Upon reconsideration, 
we look upon it, however, to be but a variety of this 
species, differing chiefly in the length of the second joint 
of the peduncle of the superior pair of antennae, the 
length of the central caudal plate, and the general colour 
of the animal. 
