214 HANDBOOK OF LNVERTEBRATE ZOOLOGY. 



long as the exopodite, cylindrical, and five-jointed. It 

 ends with two long plumose hairs and two shorter simple 

 hairs. 



8. The second maxilliped (Fig. 109_, Mp^). This is 

 much like the first maxilliped, but its endopodite is rudi- 

 mentary. 



These are all the appendages which are present in the 

 newly-hatched zoea of Callinectes, but in the older zoea 

 of this species, and in the newly-hatched zoeas of many 

 other species a nearly vertical series of bud-like protuber- 

 ances will be seen underneath the edge of the carapace, 

 between the base of the second maxilliped and the first 

 segment of the abdomen. These 1)uds are the rudimen- 

 tary third maxillipeds and the pereiopods. 



9. Make careful drawings of the appendages of the zoea, 

 and compare them with the corresponding appendages of 

 the adult. 



10. The abdomen (Figs. 105 and 106, a). This consists 

 of five free segments, the sixth being fused with the telson. 

 The telson is deeply forked, the anus is in the notch of the 

 fork, and on each side of it there are a number of plumose 

 hairs : three hairs in the newly-hatched zoea of Callinectes, 

 but none in some other species. The pointed prong of the 

 telson carries two movable hairs or spines, which are not 

 plumose. 



11. Make a sketch of the telson. 



m. The Embryonic Zoea. A few minutes after hatch- 

 ing, the zoea of Callinectes has the form above described ; 

 but if a crab zoea be taken immediately after leaving the 

 egg, it w ill be found to be enclosed in a delicate, trans- 

 parent, embryonic skin, which is very quickly stripped off 

 as soon as the lan'a begins to swim. Place a female crab 

 with eggs in an aquarium, and, keeping her until the eggs 



