EXPLANATION OF PLATE IX. 



Larval young of the Lobster, Homarus Amcricanus Edwards, (p. 522.) 

 FIGURE 38. A. Lateral view of the larval young in the first stage observed, enlarged 

 seven diameters. 



B. The same in a dorsal view, the abdomen held horizontally. 



C. Antennula, enlarged fourteen diameters. 



D. One of the thoracic legs of the second pair, enlarged fourteen diam 

 eters ; a, exopodus ; &, epipodus ; c, branchiae. 



39. E. Lateral view of the larval young in the third stage, enlarged five and 

 one-half diameters. 



F. Terminal portion of the abdomen seen from above, enlarged ten diam 

 eters ; a, one of the small spines of the posterior margin of the terminal 

 segment, enlarged fifty diameters. 



G. Basal portion of one of the legs of the second pair, showing the epip 

 odus and branchias, enlarged fourteen diameters. 



(All the figures were dra\vu from alcoholic specimens, by S. I. Smith.) 



