346 THE ANATOMY OF IXVERTEBRATED 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 geiia^ in such a manner as to be freely movable 



Fig. ^l.—Blatta orientalU.—l., TI. Side and front views of the head : a, the epicranial 

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

 antennas ; g, the eyes ; lb, the lahrum ; wm, the mandible; co, the cardo; st, the 

 Btipes ; ga, the galea ; pi, the palpus of the maxilla ; p. the palj)U8 ; q, the men- 

 turn and submentnm of the labium; k, the marjrins of the occipital foramen : ic, 

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

 labium and the riorht maxilla, viewed from below; letters as before, except ?o, 

 lacinia of the maxilla; pg^ paraglossag; li^ ligula; m, mentum; 5W, 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 



