218 HANDBOOK OF INVERTEBRATE ZOOLOGY. 



but while crawling it may be bent forwards under the ven- 

 tral surface of the fore-body, as in the adult. 



c. Make a drawing of the megalops larva, showing as 

 many of these points as possible. 



d. Examine the appendages more carefully, dissecting 

 them out with needles, and notice : 



1. The basal joint of the antennule (Fig. 110, A) is 

 swollen, and the otocyst ifiay be seen through the trans- 

 parent integument. Its opening on the upper surface is 

 fringed by a few long hairs, which project beyond the edge 

 of the carapace. 



2. The flagellum of the antenna (Fig. 110, An) is com- 

 paratively very much longer than it is in the adult, and 

 single. The basal joints of the antenna are not very much 

 larger or longer than the terminal joints, and it is not 

 doubled back under the carapace. 



FIG. 111. First maxilla of the Megalops 

 of Portunus. (From Claus, Untersuchen 

 zur Erforschuny der Genealogischen 

 Grundlage des Crustaceen- Systems. Taf. 

 xiii.) 



1. Coxopodite. 2. Basipodite. en. En- 

 FIG. ill. dopodite. 



3. The mandible is very similar to that of the adult, 

 and carries a jointed palp. 



4. The first maxilla (Fig. Ill) is very similar to that 

 of the adult, but the hairs upon its basal joints are less 

 numerous, and comparatively very much longer. 



5. Tho second maxillae (Fig. 112) also have larger and 

 less numerous hairs, and the seaphognathite (sc) is fringed 

 with hairs around its entire edge. 



6. The exopodite (ex) of the first maziUiped (Fig. 113) 

 is quite like that of the zoea, and carries four long hairs, 



