lx 



PROCEEDINGS OF THE 



and Poduridce. M. Nicolet lias already divided the latter into 

 three groups, — the Podurelles, containing the elongated forms ; the 

 Smyntliurelles, which correspond to the old genus Smynthurus ; 

 and the Lipurelles, for the non-saltatorial species. These three 

 groups Mr. Lubbock considers as three families, and it is to the 

 second of the three that his present observations are confined. 

 To the two genera of which it has hitherto consisted he adds a 

 third, characterized by having the antennae four-jointed, without 

 an elbow, and with a short terminal segment. The organs of 

 respiration also are very different. Of this genus he describes 

 two new species, as well as one of Smyntliurus. 



Without going through the various opinions which have been 

 held as to the composition of the mouth in the Poduridte, it may 

 be sufficient to mention that M. Nicolet, whose views have gene- 

 rally been followed by succeeding writers, describes, first, a la- 

 brum ; secondly, mandibles ; thirdly, maxillae ; fourthly, a labium. 

 He found no palpi. Mr. Lubbock, however, describes a pair of 

 small palpi, and also a pair of membranous organs which re- 

 present perhaps the second pair of maxillae. There is, more- 

 over, another membranous body in front of the labium, which is 

 equivalent, probably, to the langue vesiculeuse of the Lepismida. 

 If this is to be considered as representing another pair of append- 

 ages, it is evident that the mouth of the Thysanoura presents 

 several interesting peculiarities in which it differs from that of 

 other hexapod Articulata and makes an approach to other groups 

 of the great A nnulose series. Mr. Lubbock, however, hesitates to 

 draw the conclusions which seem to him to follow from these facts, 

 until he shall have been able to study the construction of the 

 mouth in other allied families. 



The digestive organs consist of a narrow oesophagus, a capa- 

 cious stomach, and a short rectum. The generative organs of the 

 female consist of two egg-tubes, one on each side, communicating 

 by a rather long vagina with the vulva, which opens with the 

 anus at the posterior end of the body. The testes are formed 

 on the same type as the ovary; at their posterior extremity 

 they expand into a somewhat triangular "receptacle," two sides 

 of which are accompanied by a glandular organ, the cavity of 

 winch is filled with minute granules. From each receptacle a 

 short, narrow vas deferens leads into a somewhat pear-shaped 

 ductlll ejaculatoriiiH, which opens in a papilla immediately in front 

 of the anus. There appears to be no penis. 



In Smynlhurus the spiracles are two in number, and open on 



