CALLIANASSA. 
93 
Fam. THALASSINIDjE , 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 antennse 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. 
