CALLIANASSA. 93 



Fam. THALASSINIJDjE, Bell. 



Abdomen very long, its teguments not very firm : cara- 

 pace small and much compressed on the sides ; sternal plate 

 almost linear throughout its whole extent. Front legs 

 large; outer antennas without a movable plate, excepting 

 in the genus Calocaris. 



It would seem that some of the exotic species of this 

 family must have the power of occasionally leaving the 

 water and remaining out of it for a considerable time, as 

 one species is reported to do considerable injury to newly 

 made roads, by burrowing in them and making holes. 



Gen. 31. CALLIANASSA, Leach. 



Carapace very small, without a beak. Eye-stalks almost 

 lamellar. Third pair of legs very wide near the end, their 

 penultimate joint almost oval ; it is with this pair of feet 

 chiefly that the Callianassa digs its burrow in the sand. 

 Second pair of legs two-toed. Front legs very large, one 

 of the hands much more developed on one side than the 

 other, compressed. 



Abdomen very large and somewhat depressed; widest 

 beyond the middle. 



