DIVISIONS OF THE GENUS. 
* Hinder claws with a longitudinal elevated line. Second joint of the internal footstalk of the external 
double palpes with the internal apex truncate. 
a. Orbit internally at the insertion of the antenna; imperfect: wrists bidentate. 
b. Orbit internally slightly imperfect: wrists unidentate. 
** Hinder claws without an elevated line. External double palpes with the second joint of the internal 
footstalk notched at the internal side. ( Orbit internally, under the insertion of the external 
antenna;, imperfect: wrists with one tooth). 
The Portmi, which are commonly named by our Fishermen flying or flat-footed Crabs, 
have the power of swimming in the ocean ; they effect this by means of their flat hinder legs, 
which serve the purposes of fins. Some of the species, especially those of the first division, 
frequent rocky coasts, and are to be found at low tide lurking under stones, whilst those of the 
second division inhabit sandy coasts, approaching the shores only at certain seasons of the year. 
