EXPLANATION OF PLATES. 



TAB. I. 

 F'ig. 1. Apus cancriformis . 



a. Mandible, b. Mouth. c. Aiitenua. d. First pair of feet. 

 e. Second do. /. Eleventh do. cj. Twelfth do. h. Branchial plate. 



2. Young animal. 3. Do. a little older. 



TAB. H. 

 Fig. 1. Nebalia bipes. 



a. First pair of jaws. b. One of the branchial feet. c. One of the 

 natatory feet. 



2, 3. Artcmia salina, male and female. 



Fig. 2, a. Antenna of male. b. Antennulc. c. One of the branchial feet. 



4. Do. young. 



TAB. III. 



Figs. 1,2. Cfiirocephalus diaphanus, male and female. 



TAB. IV. 

 C/tir o ceph alus diap h an us . 



Fig. A. Autennule. B. Prehensile antennae of male. c. Appendages 

 belonging to them. c*. Profile view of ditto. D. Triangular plate 

 of ditto. E. Head of female in profile, with antenna;. F. Dorsal 

 view of ditto, to show the eyes. G. Labrum. H. Mandible. 



In Figs. B, c, c*, E, and F a, represents the autenuules ; b, large 



antennae ; c, trunk ; d, flexible appendages ; e, triangular plate ; 



f, organ similar to what is seen in Evadue ; y, eyes ; h, remains 



of foetal eye ; i, organ similar to what Zaddacu calls in Apus 



the glandular processes of stomach ; /-, mandible ; m, labrum. 



TAB. V. 

 Chirocephalus diaphanus. 



Fig. A. Jaws. * One of the setae magnified. B. One of the branchial 

 feet. c. Male organ of generation. 



Fig. 1. Ovum. 



2. Young, half detached from ovum. 



3. Young, while still in internal envelope. 



4. Do. two hours old. 



5. Do. a little further advanced. 



(5. Do. in a more advanced stage of development. 

 7. Do. still further advanced. 



