34 



CARL BOVALLIUS, THE OXYCEPHALIDS. 



None of the following pairs of legs are prehensile in any of the 

 adult forms of the genera dealt with in this treatise. The seventh pair are 

 complete in all the genera of the Oxycepbalidge (fig. 58) with the excep- 

 tion of Tullbergella (fig. 59), in which the carpus and metacarpus 

 are fused together, a feature closely resembling that which occurs in the 

 families Vibilidce and Cyllopodidce among the Hyperiidea recticornia, and a 

 feature also suggesting the relation of the Oxycephalidae with the 

 Pronoidce. In Xiphocephalidas the seventh pair are transformed (fig. 47). 



Fig. 57. The first pair of 

 Xiphocephahts arm fi tits. 



Fig. 58. Streetsia cari- 

 nata. 



Fig. 59. Tullbergella 

 cuspidata. 



The femur. In none of the Oxycephalids is the femur of the first 

 four pairs of peraeopoda much dilated ; it is broadest in the first and 

 second pairs in Oxycephalus but scarcely half as broad as long. The 

 femur is narrowest, almost linear, in all the legs in the Xiphocephalidas. 

 In the Oxycephalidre the femur of the third and fourth pairs is usu- 

 ally narrow, and linear, while that of the last three pairs is on the other 

 hand more or less dilated; in Glos socep halus it is comparatively nar- 

 rowest; then come, with the femur increasing in breadth, Doryce- 

 phalus, Leptocotis, C alamorhynchus, Streetsia, Tullbergella, 

 Cranocephalus, Oxycephalus and Stebbingella, in which last the fe- 

 mur is much dilated, somewhat tending to the form adopted by the Para- 

 scelidce. In Stebbingella we have also the peculiarity, that the external 

 surface of the joint shows some pits or holes which are probably 

 for cutaneous glands (fig. 60). In all the genera except Stebbingella 

 the femur of the sixth pair is broader than, or at least as broad as, the 

 femur of the fifth pair. In Stebbingella the femur of the fifth pair 

 is broadest. In Tullbergella the femur of the sixth pair (fig. 61) 

 is produced at the lower hind corner into a long sharp process. In 

 Streetsia the lower hind apex of the femur of the sixth pair (fig. 

 62) is produced downwards, so that the germ articulates sub-apically with 

 the femur, a feature which shows some connection with that which oc- 

 curs in the Pronoidce. The form of the femur of the seventh pair is 



