HIGHER CRUSTACEA OF THE L.M.B.C. DISTRICT. 201 
reaching to the middle of the second joint of the flagellum, 
the last jomt minute. 
Lower ANTENN#: First joint shorter and thicker than 
the second, which is equal to the third. Flagellum ten to 
eleven-jointed, the first joint nearly equal to the three 
succeeding united. 
First GNaTHOPoDS: First joint as long as the three 
following, the second and third being very short, wrist and 
hand about equal. First joint with a few hairs on the 
front margin, the second densely hairy on the hind margin, 
the third with short fur on the hind margin and long hairs 
at the distal end. The hand tapers and forms with the 
immoveable finger an elongated cone, furnished on the 
hinder (i.e. lower) margin with a row of five or six short 
spines and a few sete. On account of the roundness of 
this joint the spines cannot always be seen. The finger 
has a hinged spine articulated to the upper side near the 
point beyond which it extends, giving it the appearance of 
being split. 
SECOND GNATHOPOD: First joint the longest, second 
equal to the fourth (wrist), which is longer and deeper 
than the hand. This limb is of a type common in this 
family, and is well represented by that of Orchomene 
serratus, in Boeck’s ‘‘ Amphipoda,”’ pl. v., fig. 2.4. 
First PER#opops: Hinder margins of third and fourth 
joints equal, and furnished with long hairs. Front margin 
of third produced to one-third of the length of the fourth. 
Fifth joint half as long again as the fourth, with nine or 
ten strong spines on the hinder margin and three more 
slender on the front. | 
Last PER#opops: First joint dilated ; a row of twelve 
or thirteen spines on the anterior margin gradually in- 
creasing in size downwards and terminating at the apex, 
which is produced downwards, in a group of one large and 
