452 
ZOOLOOY OF THE FAR FAST. 
was not able to detect any calceoli on the first antenna of the male. The Ijranchial 
lamellae are simple, without accessory vesicles. 
Distribution. — This is the first record of the species from Japan but it? occurrence 
there is not unexpected. Its distribution can now be traced right across the Palae- 
arctic region from the British Isles to Japan. 
Family TALITRIDAE. 
Genus Talorchestia, Dana. 
Talorchcstia japonica, n. sp. 
[PL XXI, figs. i-io. J 
Lucality. — Among damp weeds on the shore of Lake Biwa at Zeze, 3-X-15, thirty 
specimens up to 9 mm. in length. 
Description. — Body smooth without ridges or carinae, or armature of spinules 
or setae ; preserved specimens show extensive traces of a rose-coloured pigment on 
the thoracic and abdominal somites in bands across the dorsal surface, most pro- 
nounced on the last three thoracic and first three abdominal somites ; first and second 
antennae also tinged rose colour. 
Eyes moderately large, separated dorsally by a distance less than their greatest 
diameter, pigment black. 
Side-plates one to four with a few small setae on their lower margins, second to 
fourth with a prominent lobe on the hind margin about the centre ; third segment of 
the pleon (pi. XXI, fig. 6) with its lower posterior corner slightly produced and its hind 
margin with four or five minute serrations, each serration arm°d with a small spinule. 
First ani:nna equal in length to the first four joints of the peduncle of the .second 
pair ; three joints of the peduncle subequal in length, each furnished with a single 
spine on its upper distal corner, the second and third joints with one or two spines 
at their lower distal corners; flagellum of 4-5 joints. 
Second antenna with the fifth joint of the peduncle equal in length to the pre- 
ceding four joints but narrower ; third joint with a group of seven spines on the 
lower distal corner, two on the upper distal corner and two or three scattered over 
the surface ; fourth joint with three groups of two spines on the lower border, one 
spine at the upper distal corner, one on the outer margin and five or six scattered 
over the surface ; fifth joint with g-io spines on the upper margin and three or 
four on the distal part of the lower margin ; flagellum slightly longer than the pe- 
duncle and composed of 11-14 joints. 
Second thoracic limbs of the male (pi. XXI, fig. 3) with the side-plate widening 
slightly distally, its lower margin provided with four or five .setae ; no pellucid lobe 
on the merus; carpus about equal to the propodus with a prominent rounded pellucid 
lobe on the hind margin towards the distal end ; propodus widening distally to the 
usual lobe on its hinder margin, a row of setae marking the junction of the lobe 
with the joint proper ; dactylus shorter than the palm formed by the wider end of 
the propodus; setae on the limb few and short. 
