562 GEOFFREY SMITH. 
‘he telson has an elongated form with slightly concave 
sides. ‘The posterior margin is produced into a number of 
spines of very unequal length (text-fig. 338 and 34). 
‘he uropods have a short basal segment; the exopodite 
has six or seven stout spines on its external border. The 
other setze fringing the uropods are uniform. 
The adult animal may attain an inch in length. 
The colour is transparent green, but with a few minute 
black chromatophores scattered about, chiefly on the lateral 
portions of the segments. 
Occurrence.—lIn the littoral zone of the Great Lake of 
‘‘asmania, among weeds and stones. Klevation 3700 ft. 
Genus 3. Prveanaspides (Woodward 18). (Text-fig. 3.) 
The first thoracic segment is much shorter than the others ; 
the succeeding thoracic segments are sub-equal in size and 
the abdominal segments are on the whole equal to the thoracic. 
There is no dorsal flexure. The antennal scale is apparently 
just equal in length to the first two joints of the endopodite. 
The segment of the thoracic limbs immediately proximal to 
the knee-joint is expanded especially in the anterior limbs. 
The sixth abdominal segment and the telson are together a 
little longer than the two preceding segments. ‘The telson is 
equal in length to the uropods. 
P. precursor (Woodward 18). 
The characters of this very important fossil are exhibited 
in text-fig. 5. 
It is at once seen from these figures how close is the 
resemblance in all the essential characters between it and 
the living Anaspides. Similar transverse striations on the 
segments have been observed by Woodward in Palxocaris. 
With regard to the segmentation of the thoracic limbs it 
would appear that there were the typical three segments 
distal to the knee-joint and four segments proximal to 1b, 
