ANNULOSA: CRUSTACEA. 



175 



podite.' In this particular segment, the exopodite and endo- 

 podite are greatly expanded, so as to form powerful paddles, 

 and the exopodite is divided into two by a transverse joint. 

 In the succeeding somites of the abdomen with the exception 



CCL~ 



Fig. 49. Morphology of Lobster. 1. Lobster with all the appendages, except 

 the terminal swimmerets, removed, and the abdominal somites separated 

 from one another, ca. Carapace ; t. Telson. '2. The third abdominal somite 

 separated, t. Tergum ; s. Sternum ; p. Pleuron ; a. Protopodite ; b. Exopo- 

 dite ; c. Endopodite. 3. One of the last pair or foot-jaws or maxilliptdes. 

 . Epipodite ; g. Gill ; the other letters as before. 



of the first, in which there is some modification the appen- 

 dages are in the form of swimmerets, essentially the same as 

 those attached to the penultimate segment, and differing only 

 in the fact, that the exopodite and endopodite are much nar- 



