466 Mr. G. W. Smith. On We Anaspidide and [June 10, 
character which makes it all the more difficult to preserve the Schizopoda as 
a natural group. 
The observations which I have to offer upon the Tasmanian Anaspidide 
both in respect of their habits in a natural state and of their anatomy, will, I 
believe, confirm the desirability of following Calman’s classification in doing 
away with the Schizopoda as a natural group, and certainly of placing the 
Anaspidacea in a separate division. 
I have also to report the discovery of a new genus and species of the 
Anaspidide from the Great Lake of Tasmania, which I propose to name 
Paranaspides lacustris, so that at the present time, not counting possible fossil 
allies, three types of the Anaspidacea are known, viz., Anaspides tasmanie 
(Thomson) and Paranaspides lacustris (Smith), from Tasmania, constituting 
the family Anaspidide, and Koonunga cursor (Sayce), representing a separate 
family, Koonungide, from southern Victoria. 
Anaspides tasmanie (Thomson). 
Habits and Occurrence.—During an expedition to Tasmania. which I was 
enabled to undertake through the assistance of Professor G. C. Bourne and 
the British Association, four localities were established where the shrimp 
occurred: (1) in isolated pools and in the pools of the upper part of the 
North-west Bay River as it leaves the table-land on the top of Mount 
Wellington ; (2) some large tarns near the summit of the Harz Mountains to 
the south-west of Hobart; (3) the tarns and mountain streams near the top 
of Mount Field to the north-west of Hobart; (4) in the tarns near Mount 
Read on the west coast. The animal, therefore, appears to be confined to 
the southern and western part of the island, and it is always found at a high 
elevation of 2000—4000 feet, in ice-cold water of absolute clarity. 
The body of a very large specimen may measure 2 inches in length, and the 
yellowish skin is deeply pigmented with black chromatophors. There is no 
calcification in the exoskeleton, though small deposits of lime are present 
round the thoracic ganglia. 
The animal pursues a creeping habit, walking about on the rocks and 
among the vegetable growths at the bottom of the pools; occasionally it swims 
lazily in the water, and on reaching the surface may turn over on its back, 
like a Phyllopod. When disturbed, it gives rapid side-strokes with the 
abdomen and tail fan, which drive it forwards or sideways; it never springs 
backwards, as so many Malacostraca do. The most interesting point about 
the creature in its natural state is that the body is held quite flat and 
unflexed, with the walking thoracic legs and abdominal pleopods, which also 
