EXPLANATION OF PLATE IX. 



Larval young of the Lobster, Homarus Americantis 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. Antenuula, enlarged fourteen diameters. 



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

 eters ; a, exopodus ; &, epipodus ; c, branch i.-f. 



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 branchia?, enlarged fourteen diameters. 



(All the figures were drawn from alcoholic specimens, by S. I. Smith.) 



