436 CRUSTACEA [November, 



taches himself by means of his monodactyle hands, to 

 the posterior processes of her abdomen. The connection 

 endures so long, that the tergum of the female at the two 

 posterior spines, is very much worn, by friction with the 

 anterior part of the thorax of the male, and the posterior 

 processes are often almost worn through, by the pressure 

 of his thumbs. 



The L. Sowerbii figured by Dr. Leach, seems to be 

 the young -'A ihis species, as the description and figure 

 agrees perfectly with it. 



Var. i3. Abdomen five-spined on the disk, of which 

 three are in a longitudinal line as in the species, and a 

 smaller one on each side in a transverse line with the an- 

 terior spine and nearer to the elevated lateral angles. This 

 animal, which I have for the present considered as a va- 

 riety only, is an inhabitant of the southern states and Flo- 

 rida, vv here they abound in considerable numbers; how 

 far they may be found to the north I know not, or whe- 

 ther they inhabit the same districts with the species, but 

 I have not observed them on this side of the Chesapeake 

 bay. Although in general appearance it is perfectly si- 

 milar to L. Polyphemus, yet in consideration of the cha- 

 racter here noted, I propose that it be separated as a dis- 

 tinct species under the name of australis* 



Genus PANDARUS. Leach. 

 Abdomen at base covered by imbricate scales. 



SPECIES. 



P. sinuatus^. Body dilated, thorax emarginate be- 

 fore, abdomen sinuate behind. 



