OF CRUSTACEA. 373 



power to adduce some additional proofs of the same fact by 

 examples taken from the above enumerated foreign genera of 

 land and'amphibious crabs, which friends abroad have enabled 

 me to do, by sending me females carefully preserved in spirits, 

 with ova on the point of hatching. 



The Zo'ea, or larvae of these, although not perfectly de- 

 veloped, are . as^much so as that of the spider-crab, as given 

 above, (fig. 1,) with which indeed they correspond in every 

 essential particular. Fig. 3 represents that of Gegarcinus 



hydrodomus (Herbst. PI. 41.) Fig. 4 is the larva of the crab 

 (Herbst. PI. 47. f. 7,) which I name Thelphusa erythropus. 



Fig. 5 is the larva still less"~perfectly formed of the crab 

 I have designated as Eriphia carrihcea. The larva of 



