Mysiddcea, Tanaidacea and Isopoda. 
429 
Cleantis annandalei, sp. nov. 
PI. XVII, Figs. i-ii. 
Locality .—Whangpoo River, China, about 10 miles below Shanghai, 5-7 metres, 
10. xii. 15, one female, 13 mm., two males, 12 and 10 mm., -f^^. In fresh water. 
Description . — -Body (fig. i) linear in shape, not parallel-sided but somewhat 
broader in the centre than either at the anterior or posterior ends, about 3^ times 
as long as broad ; head somewhat vaulted, the front margin sinuate with a median 
depression, a deeply impressed groove, rather curved, running across the posterior 
part, eyes small, dorsally placed, rather in front of the middle of the lateral margins 
of the head ; second thoracic segment without coxal plates, the lateral parts produced 
forward ; third to eighth thoracic segments with distinct coxal plates visible in the 
dorsal view, those of the third to fifth segments small, not occupying the whole of 
the lateral margins of the segmerits ; those of the sixth to eighth segments extending 
the whole width of the segments ; metasome not quite half as long as the body, 
composed of four segments, that is three complete segments and the telsonic segment, 
with an additional pair of sutures on the anterior part of the latter, posterior margin 
of the telsonic segment terminating in two acute processes between which the apex 
is emarginate. 
Antennules (fig. 2) small, extending to the distal end of the second joint of the 
peduncle of the antennae, the three joints of the peduncle successively narrower 
than the preceding joint, first and third joints equal in length and longer than the 
second, flagellum consisting of one minute joint tipped by a few short setae. 
Antennae (fig. 3) reaching somewhat posterior to the hinder margin of the 
third thoracic somite, first three joints of the peduncle short, fourth and fifth long 
and about equal in length to each other, flagellum about one and a half times as 
long as the fifth joint of the peduncle and consisting of one very long joint and 
a very small terminal joint, the whole flagellum with a clothing of fine hairs on each 
margin, among which a few stronger setae can be detected. 
P'irst maxilla (fig. 4) with about eleven or twelve terminal spines, some of which 
are denticulate, on the outer lobe, and three plumose spines on the inner lobe. 
Maxillipede (fig. 5) with the coxopodite in two portions, basipodite narrower 
than the epipodite, and a little shorter, inner lobe with two coupling hooks and an 
armature of strong plumose spines at the apex, palp of five joints, the first joint 
small, the second and third cup-shaped, the fourth joint the longest and oval in 
shape, the fifth joint small but distinctly marked off. 
Second thoracic limb (fig. 6) rather stout, outer distal corner of the merus some- 
what produced, with a group of long setae at the apex of the process, carpus small, 
propodus longer than the merus and carpus combined and somewhat expanded, 
dactylus long and narrow, not quite as long as the propodus and with a joint near 
the distal end ; the merus, carpus and propodus bear groups of ^iniform setae on their 
inner marg'ins, while the dactylus has two or three small spinules near its tip and a 
pencil of setae on the outer edge just where the terminal portion is marked off. 
