Vv PARANASPIDES AND KOONUNGA 76 
and the modification of the endopodites of the first two abdominal 
appendages in the male to form a copulatory organ. 
A type of a new genus of this family was found by me in the 
littoral zone of the Great Lake of Tasmania at an elevation of 
3700 feet, and named Paranaspides lacustris. 
This little shrimp (Fig. 78), which does not appear to grow 
to more than an inch in length, is totally different in appearance 
from Anaspides, being pale green and transparent, with a very 
marked dorsal hump as in JMysis, to which it bears a very 
Fic. 78.—Paranaspides lacustris, x 4. a, a?, First and second antennae ; Ad. /, first 
abdominal segment ; ep, epipodites or gills on the thoracic legs ; md, mandible ; 
P1.1, first pleopod ; 7, telson; 7h.8, eighth free thoracic segment ; U, uropod, or 
sixth pleopod. 
striking superficial resemblance. It leads a more active swim- 
ming life than Anaspides, and with this habit is correlated the 
flexure of the body and the greater size of the tail-fan and the 
scale of the second antenna. The mandible is peculiar in being 
furnished with a four-jointed biramous palp, while that of Anas- 
pides is three - jointed and uniramous, and the first thoracic 
appendage is provided with a setose biting lobe on the ante- 
penultimate joint, thus more resembling a maxillipede. In other 
respects it agrees essentially in structure with Anaspides. 
Fam. 2. Koonungidae.— The sole representative of this 
family, Koonunga cursor, has been recently described by Mr. 
O. A. Sayce,’ of Melbourne University, from a small stream some 
1 The Victorian Naturalist, xxiv., 1907, p. 117. 
