264 THE LIFE OF CRUSTACEA 



a tail-fan. In these points they resemble the shrimp- 

 like forms, but there is no carapace, and all the 

 somites of the thorax are distinct, so that the form 

 of the body is rather that of an Amphipod or Isopod. 

 On the discovery of the remarkable Crustacean 

 Anaspides (Fig. 84), which lives in fresh- water pools 

 in the mountains of Tasmania, it was pointed out 

 that it agreed with the fossil genera Uronectes, Pal<zo- 



FIG. 84 THE TASMANIAN "MOUNTAIN SHRIMP" (Anaspides 

 tasmania), A LIVING REPRESENTATIVE OF THE SYNCARIDA. 

 SLIGHTLY ENLARGED 



c.gr. t "Cervical groove," marking off the first thoracic somite; 

 ii-viii, the remaining thoracic somites; 1-6, the abdominal 

 somites 



can's, and their allies, in those very characters in 

 which they differed from all other Crustacea, and that 

 it must be regarded as a surviving representative of 

 the ancient group to which the name of Syncarida 

 had been given. The more recent discoveries of 

 living forms, Paranaspides from the Great Lake of 

 Tasmania and Koonunga from fresh- water pools near 



