LEGS IN SEVERAL SAMPLES 383 
segment, dilated in the middle and ending obtusely. The 
first antennee are short, the second long, with the flagellum 
shorter than the peduncle. The mandibles are without 
‘palp ;’ the maxillipeds have the two terminal joints of 
the ‘palp’ very short. The third pair of limbs of the 
perzeon are the most robust, while the fourth pair are very 
small, and the seventh not much larger. ‘The uropods are 
long, slender, simple, two-jointed. ‘The type is the Nor- 
wegian Macrostylis spinigera, from a specimen about a six- 
teenth of an inch long. Macrostylis latifrons, Beddard, 
from 2,050 fathoms in the North Pacific, is a fifth of an 
inch long. Vana longiremis, Meinert, 1890, beyond doubt 
agrees generically and probably also specifically with the 
type of Macrostylis. 
Ischnosoma, Sars, 1866, meaning ‘a slender body,’ is, 
perhaps, the most singular-looking of this family. The 
fourth and fifth segments of the pereeon are fused, and 
combine to form a columnar centre to the animal. The 
pleon is constricted at the base. There are no eyes. The 
mandibles have a large molar, but no ‘palp.’ The first 
limbs of the perzeon are short and robust, the others slender 
and long. ‘The uropods have a single one-jointed branch. 
The type is the Norwegian species, [schnosoma bispinosum, 
Sars. The same author has described an Arctic species, 
Ischnosoma quadrispinosum.  Beddard adds Ischnosoma 
spinosum (see Plate XIV.), from the Azores, Ischnosoma 
bacillus, from 50° south latitude, Ischnosoma bacilloides, 
from South America, and Ischnosoma Thomsoni, from 2,050 
fathoms depth in the North Pacific. 
Family 2.—Munnopside. 
The animal has a bipartite appearance, the anterior 
portion consisting of the head and first four segments of 
the perzeon, the last three segments of the pereeon and the 
consolidated pleon forming the other. ‘There are no eyes. 
The first limbs of the perzeon are subprehensile and shorter 
than the three following pairs of limbs, which are ambu- 
latory and in general very elongate; the next two or the 
next three pairs are natatory, having some of the joints 
