88 J. F. McCLENDON. 



PLATE V. 



{Pandarus siniiatus Verrill.} 



(One half of each figure shows the dorsal, the other half the ventral aspect. In 

 Figs. 43 and 45 the ventral aspect is to the right and in the remaining figures to the 

 left.) 



FIG. 43. Staged. The rudiments of the ganglia, w'- 4 , are shown. The strippled 

 rods are spindles of entoblast nuclei. 



FIG. 44. Stage C. At x are minute (mesoblast?) cells in the yolk. Some muscles 

 in the right side of the figure are beginning to elongate. Over the ganglion of the 

 second antenna is a cluster of mesoblast cells of unknown history. 



FIG. 45. Stage D. The appendages are beginning to bud out. The ganglia have 

 become connected by thickened ectoderm (outlined by a dotted line). The muscle- 

 cells are beginning to elongate radially, and above them the ectoderm cells are 

 elongated in the opposite direction (some of them are represented by dotted outlines, 

 ec). The entoblast is not represented, but a few small dark cells are shown in the 

 yolk. 



FIG. 46. Stage D, later than in Fig. 45. The ectoderm thickening to form the 

 stomadceum is shown at o. 



FIG. 47. The nauplius a short time before hatching. 



FIG. 48. The nauplius just before hatching. In the left half of the figure the 

 ganglia and mesoblastic rudiments of the post nauplius appendages are shown 

 (stippled) in process of formation. 



