180 



HANDBOOK OF INVERTEBRATE ZOOLOGY. 



endopodite. The remainder of the appendage forms the 

 flattened scaphognathite (.sc), which is, probably, a modi- 

 fied exopodite. 



e. After removing the second maxillae, notice under 

 them the still more delicate and foliaceous first maxilla? 

 (Fig. 96). Remove these, and notice that the basipo- 

 dite (b) and the coxopodite (ex) are very much elongated 

 and jaw-like, while the exopodite is absent, and the endo- 

 podite (en) is very small, but not quite as 

 eri rudimentary as that of the second maxilla. 



FIG. 96. Outer surface of left first maxilla; 

 natural size. (Drawn from nature by W. K. 

 Brooks. ) 



Letters as in Fig. 92. 



C3- 



FIG. 96. 



f. Notice the cutting edges of the mandibles, which 

 meet each other on the middle line. Force them apart, 

 and notice between them the mouth, with its membrane- 

 ous, hairy upper lip, with several small calcifications, and 

 just posterior to the cutting edges of the mandibles notice 

 on each side of the middle line of the body a spatulate 

 process which runs downwards and lies in contact with the 

 surface of the mandible. These two processes form the 

 metastoma, or lower lip. Each 

 consists of a calcified rim or 

 frame, covered by a soft mem- 

 brane. 



FIG. 97. Outer surface of left man- 

 dible; natural size. (Drawn from na- 

 ture by W. K. Brooks. ) 



a, a. Apodemata. b. Body of Man- 

 dible, p. Mandibular palpus. 



CL 



Fie. 07. 



Remove the mandibles, and, examining them, notice that 



