346 THE ANATOMY OF IN VERTEB RATED ANIMALS. 



mandible is articulated with the truncated edge of the lateral 

 part of the skeleton of the head, beneath the eyes, which is 

 termed the gena, in such a manner as to be freely movable 



FIG. Wt.Blatta orientalis.I., II. Side and front views of the head : a, the epicranial 

 suture, at the ends of the lateral hranches of which are 6, the feneetrse ; /, the 

 antennae ; g, the eyes ; Ib, the labruoi ; mn, the mandible; co, the cardo ; $t< the 

 stipes ; go,, the eralea ; pi, the palpus of the maxilla ; p. the palpus ; q, the men- 

 turn and enhmentum of the labium ; k, the margins of the occipital foramen : ic, 

 inferior cervical sclerites ; Ic, lateral cervical sclerites; pn, pronotum. III. The 

 labiutn and the rierht maxilla, viewed from below ; letters as before, except la, 

 lacinia of the maxilla ; pa, paraglossse : fe', ligula ; m, mentum : m, submentum of 

 the labium. 



toward and from the median line, but in no other direction. 

 The proximal end of the maxilla (Fig. 97, III.) is formed by 

 an elongated basal articulation, the cardo, which is directed 

 transversely to the axis of the head, and is connected with 

 the inferior margin of the epicranium, or rather with a thin 

 skeletal band which runs round the posterior margin of the 



