PLATE 81 A. 



P»ge 



Fig. 1. EURTPTERUS LACUSTRIS. 407* 



1. A large individual which is deprived of the appendages, excejjt one dismembered swim- 

 ming foot. The specimen is compressed, and the little pustule-lilce scales have the ap- 

 pearance of pores in the crust. [ These have been very incoriectly represented in the 

 drawing; there being but two rows, and these not parallel, on the si.x posterior joints, 

 while the six rows are but indistinctly visible on a few of the thoracic segments.] 



Individuals of this species frequently attain a larger sine than this, as seen in other 

 figures. 



