346 



THE ANATOMY OF INVERTEBRATED 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 



7P. ft 



Fig. Wt.—Blatta orientalU— I , II. Side find front views of the head : o, the epicranial 

 suture, at the ends of the lateral branches of which are 6, the fenestra;/, the 

 antennae ; g, the eyes ; lb, the labrum ; mn, the mandible; ca, the cardo ; st, the 

 stipes ; ga, the galea ; pi, the palpus of the maxilla ; p. the palpus ; q. the men- 

 tum and submentnm of the labium ; k, the margins of the occipital foramen ; ic, 

 inferior cervical sclerites ; lc. lateral cervical scle rites; pn, pronotum. III. The 

 labium and the right maxilla, viewed from below; letters as before, except la, 

 lacinia of the maxilla ; pg, paraglossae; U, ligula; m, mentum; sm, 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 



