484 MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 



PLATE XL 



FIG. 25. Embryo nearly ready to hatch, released from the egg membranes. x70. Some food 



yolk is still u n absorbed ; swimming hairs very rudimentary; compare Fig. 11. 

 FIG. 26. Eight first antenna of older larva. x70. 

 FIG. 27. Profile view of hinder end of abdomen of same larva. x28. 

 FIG. 28. Second maxilla of same larva. x276. 

 FIG. 29. Mandible of same larva. x27G. 

 FIG. 30. First maxilla of same larva, x 27fi. 

 FIG. 31. Portion of third maxilliped of same larva. x70. 

 FIG. 32. Terminal segment of second pereiopod of same larva. x70. 

 FIG. 33. First pereiopod of same larva, x 70. 

 FlG. 34. Portions of third, fourth, and rudimentary fifth pereiopods of same larva, x 70. 



REFERENCE LETTERS. 



A. I, first auteuna. 



A. II, second antenna. 



AM., mandible. 



ifipd. I, in, first and third maxillipeds. 



If., rostrum. 



Th., TJi. 1, first maxilliped. 



Th. 3-Th. 5, third to fifth maxillipeds. 



1, first maxilliped. 



