560 GEOFFREY SMITH. 
ing dorsally as a hump. ‘The antennal scale is longer than the 
first two joints of the endopodite. The mandibular palp has 
a distinct setose exopoditic lobe. ‘The first thoracic lmb, 
besides the two gnathobasic lobes on the coxopodite, has the 
inner face of the first segment of the endopodite expanded 
into a setose lobe. 
The sixth abdominal segment and the telson are together 
longer than the three preceding segments. 
The telson is shorter than the uropods. 
P. lacustris (Smith 12). (Plate 11, fig. 2; text-fig. 1.) 
The frontal margin of the head is produced into a conical 
projection, the cone being tipped with a bunch of sete. 
The eye-stalks project considerably beyond the lateral 
margins of the head (text-fig. 4). The body is carried with 
a marked dorsal flexure. A triangular piece is not obviously 
marked out on the head segment, and the head segment is equal 
in length to the first thoracic. Lateral sulci are present on the 
first thoracic segment. ‘The first thoracic segment is equal 
in length to the three succeeding segments. The abdominal 
segments are all longer than the mid-thoracic segments. The 
first antennez have the basal segments elongated and rather 
slender; the internal flagellum consists of about twenty 
segments. ‘I'he otocyst is oval. 
The second antenna has a large scale, far exceeding in 
length the two joints of the peduncle (text-fig. 7). 
The palp of the mandible may be four-jointed ; 1t possesses 
a distinct exopoditic lobe, tipped with setz, and the terminal 
seoment is equal in length to the last but one (text-fig. 10). 
The palp of the first maxilla is larger than in Anaspides 
tasmanie, and there are no sete near it (text-fig. 13). 
The second maxilla has a fairly well-developed exopoditic 
lobe fringed with long sete (text-fig. 16). 
The first thoracic appendage has two gnathobasic lobes, 
and the third segment of the limb is expanded inwards intoa 
lobate biting blade (text-fig. 19). 
