224 



ANNUL AT A. 



differing essentially from those of the lobster. The mouth 

 lies on the ventral surface of the head and is surrounded by 

 a labrum or upper lip anteriorly. It is a flat plate formed 

 of the head shield, produced downwards, and is in no 

 way related to an appendage. Posteriorly, the mouth is 

 bounded by a labium or lower lip, formed by the fusion 



Fig. 149.- The Mouth Appendages of the 

 Common Cockroach x 9. {Ad nat.) 



Mandible. 



Joints of 

 Protopodite. 



Labial Palp. 



Paraglossae. 



Endopodite. 



-^ Protopodite. 



The mandibles are above the first maxillae in the middle and 

 the labium (2nd maxillae) below. 



across the middle line of a pair of appendages, the second 

 maxillce. Between labrum and labium and lateral to the 

 mouth lie a pair of mandibles^ hard-toothed crushing organs 

 with no palp, and a pair oi first maxillce. The first maxillae, 

 when dissected out, show a two-jointed basal portion (proto- 

 podite) which bears a double endopodite, the inner part of 



