ON THE ANASPIDACEA, LIVING AND FOSSIL. 923 
other members of the Syncarida. The uropods and telson 
ot Acanthotelson appear to have possessed a very aberrant 
form. 
Attention may again be called to the observation of Pro- 
fessor Fritsch, that in Gasocaris and Gampsonyx an oval 
swelling is present near the base of the inner ramus of the 
uropod, which he interprets as an otocyst (text-figs. 55, 61). 
Nothing of the sort is to be observed in any of the living 
TErxtT-FIG. 32. 
Koonunga cursor. Telson and uropods. 
Anaspidacea nor in Preanaspides. If this structure really 
is an otocyst we are evidently dealing with a character which 
must have belonged originally to the Syncarida and the 
primitive Eumalacostraca, and has been retained in certain 
Peracarida (Mysidacea) but lost in the higher Syncarida, 
Peracarida and Eucarida. 
(p) Theoretical Considerations. 
A theoretical consideration of the appendages of the 
Syncarida with their associated organs will bring out several 
