224 ANNULATA. 
differing essentially from those of the lobster. The mouth 
lies on the ventral surface of the head and is surrounded by 
a /abrum or upper lip anteriorly. Itis 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 /adium or lower lip, formed by the fusion 
Fig. 149.— THE MouTH APPENDAGES OF THE 
CoMMON COCKROACH x 9. (dd zat.) 
Mandible. 
Maxillary Palp. 
Joints of 
Protopodite. 
Labial Palp. 
The mandibles are above the first maxille in the middle and 
the labium (2nd maxillz) below. 
across the middle line of a pair of appendages, the second 
maxille. Between labrum and labium and Jateral to the 
mouth lie a pair of mandibles, hard-toothed crushing organs 
with no palp, and a pair of first maxille. The first maxille, 
when dissected out, show a two-jointed basal portion (proto- 
podite) which bears a double endopodite, the inner part of 
