368 



Dr. F. Meinert on the Campodere, 



mandibles do, but are almost entirely retracted into the bead, 

 this centre of motion is supplied by a pair of conical protube- 

 rances (fig. 1 k) on the inner surface of the skull near the back 



Fig. 1. 



a a, mandibles ; h, chitinous plate; 



c, principal flexor of mandible ; 



d, tensor of mandible ; e, muscles 

 which keep the mandibles in place ; 



f, second pair of flexors of mandi- 

 bles ; g h, muscles steadying, pro- 

 truding, and retracting chitinous 

 plate ; i, labrum ; k, protuberances 

 serving as pivots for mandibles. 



a b c, principal parts of inner 

 framework on one side; d, inner 

 lobe of maxilla (the lamellae omit- 

 ted) ; e, outer lobe of maxilla ; 

 /, palpus ; g, palpiger ; h, lingua ; 

 i, paraglossae; k, stipes of maxilla; 

 I, cardo maxillae ; m n, retracting 

 and protruding muscles of frame- 

 work. 



of the head, against which the pointed basal ends of the mandi- 

 bles are pressed when the flexors contract, and which then serve 

 them as pivots. The drawing will explain this arrangement 

 more clearly ; only it is to be observed that the mandibles have 

 been brought out of their ordinary position and slipped away 

 from the protuberances just mentioned. 



The maxillse are connected with the lingua, and, together 

 with the latter and the paraglossse, supported by a peculiar in- 

 ternal framework (fig. 2 abc) of thin chitinous pieces, of which 

 the construction will appear more fully from figure 3. The 

 most prominent part of the maxilla is the inner lobe (fig. 2 d), 

 which is more strongly chitinized than the other parts, hooked 

 or sickle-shaped, and carries on its concave inward edge five 

 curved, deeply subdivided smaller lobes or lamellae. The inner 

 maxillary lobe is supported by the stipes (fig. 3 k), which is to- 

 lerably firm, elongated, and flat. From the basal extremity of 

 the stipes a thin chitinous piece can be traced (fig. 2 /), con- 

 necting it with the outer branch of the framework just men- 



