470 Mr. G. W. Smith. On the Anaspidide and [June 10, 
Paranaspides lacustris. 
This type of a new genus of the Anaspididee was found by me in the 
Great Lake on the central plateau of Tasmania at an elevation of 3700 feet. 
It inhabits the littoral zone of the lake, living among the rocks and water- 
weeds rather after the manner of a prawn. It is totally different in external 
appearance to Anaspides, being of a green transparent colour sparsely 
powdered with biack dots, and the body exhibits a marked dorsal flexure 
very much as in Mysis, to which it bears an extraordinary superficial 
resemblance (fig. 2, Plate 13). 
The largest specimen obtained was about an inch in length. It pursues 
a swimming habit, with which is correlated the flexure of the body, the 
elongation of the abdomen, the enlarged tail fan, and the enlarged scales on 
the second antennee (figs. 5 and 4). 
Mies 3: Fig. 4. 
Fie. 3.—Paranaspides lacustris. Hind part of body, dorsal view. Abd. 6, sixth 
abdominal segment. 
Fie. 4.—Paranaspides lacustris. Second antenna, dorsal view ; bas., basipodite ; cxp., 
coxopodite.. 
Besides these characters distinguishing it from Anaspides, important 
diiferences exist in the structure of the mandible, which bears a four-jointed 
and distinctly biramous palp (fig. 5), a characteristic only found elsewhere in 
Crustacea among the Copepoda, while the first thoracic appendage bears 
on the inner face of the antepenultimate joint a setose lobe used in 
mastication (fig. 6). 
