C. Spence Bate on the Penceidea. 189 
Flagella of second pair of antenna twice the length of the 
animal. 
Length 8 inches. | 
Taken among the islands of the Australasian archipelago, 
in the North Pacific, and South Atlantic, at a depth of from 
1900 to 2050 fathoms. 
Aristeus semidentatus, n. sp. 
Rostrum styliform, straight, armed on the upper margin 
with two teeth near together in front, and one further behind 
the frontal margin. Posterior dorsal margin of the fourth, 
fifth, and sixth somites produced to a small tooth. Eye 
orbicular. Ophthalmopod slender. 
Length 34 inches (female). 
Taken south of the Philippine Islands. 
Aristeus tomentosus, n. sp. 
Surface covered with a short fur. Rostrum scarcely as 
long as the peduncle, armed with three short distal teeth. 
Pleon having a small tooth at the posterior dorsal margin of 
the fourth, fifth, and sixth somites. Hye large, orbicular. 
Length 6 inches (female). 
Taken south of the Philippine Islands. 
ore 
SZ S) A. viet 
i . 4 
Aristeus rostridentatus, n. sp. Pirere Linens 
Rostrum long, elevated, curved, armed on the upper margin 
with ten or twelve teeth, the posterior of which is situated 
on the gastric region. Third and following. somites of the 
pleon furnished with a small tooth at the posterior dorsal 
margin. Ophthalmopod short. Hye orbicular, on a slender 
ophthalmopod. Flagellum of second pair of antenne about 
six times the length of the animal. 
Length about 6 inches. 
Taken near the Fiji Islands at a depth of about 300 fathoms. 
Genus HEPOMADUS, n. g. 
There are only two specimens of this genus; they are of 
distinct species; and both are injured. The rostrum of each 
is broken; but the larger specimen has a slender tooth on 
the dorsal surface just behind the frontal margin. But the 
structure of the branchie differs from that of either Pencus or 
Aristeus in having the ultimate branches longer and in having 
the mastibranchial lash of the penultimate pair of pereiopoda 
rudimentary, in having only four podobranchial plumes, and 
in having all the pleurobranchie small except the posterior, 
as shown in the accompanying Table. | 
