202 GENERAL ORGANIZATION. 



The antennEe are large and multiarticulate, some- 

 times even longer than the body, and generally 

 tapering towards the apex. In Gamj)odea, on the 

 contrary (PI. LXVI, fig. 13), the terminal segment 

 is slightly swollen, and has at its extremities a tuft of 

 hairs. 



The mouth parts consist of a labium, mandibles, 

 maxilliB, maxillary palpi, lingula, labial palpi, and 

 labium. 



The mandibles of Lejnsvia (PL LXVI, figs. 8 and 9) 

 are short, curved, strong, and horny. Those of 

 MachiUs more nearly resemble the corresponding 

 organs of the Collembola ; they are comparatively weak, 

 elongated, and tapering towards the extremity, which 

 is obtuse, and have only rudimentary teeth ; the 

 molar portion is much developed, and projects at right 

 angles to the rest of the organ. 



In Gampodea and Icqjyx the mandibles are curved, 

 with three or four teeth, but the molar projection is not 

 well developed. 



The maxillce in Lepisma (PI. LXVI, fig. 10) consist 

 of an outer fleshy, cylindrical lobe, and an inner taper- 

 ing portion, which is triangular in form, clothed with 

 long hairs along its inner margin, and terminates in a 

 horny point. The maxillary jjalpi are well developed 

 and 5-jointed. Tlie maxilla of MachiUs (PI. LXVI, 

 fig. 3) is formed on the same plan, but is larger ; the 

 inner maxillary lobe is 2-jointed, the terminal portion 

 being tripartite ; the outer process is rounded at the 

 extremity and horny ; the two inner ones are needle- 

 shaped, sharp, unequa], the inner one being the lesser 

 of the two. The maxillary palpi are long and 7-jointed. 

 The basal segment has a process regarded by Latreille 

 as representing the cylindrical appendage of the 

 posterior legs. It is probable that the form of the 

 maxillaB differs in different species ; M. maritimns does 

 not seem to agree with M. annulicornis as described by 

 Latreille. Neither Nicolet nor Gervais describes the 

 maxillag of Nicoletia ; the palpi are in that genus said 



