PYCNOGONIDS 259 



D. Chelifori 2 -jointed .... Tanystylum intermedium, p. 278 

 C". Chelifori i -jointed; palpi 4-jointed; body very much shortened 



(Clotenia) C. occidentalis, p. 281 



A 7 . Chelifori present, chelate; palpi absent; ovigera present in the 



male only, 5- or 6-jointed (PHOXICHILIDIIDM}. 



B. First trunk segment produced very little, or not at all, anteriorly 

 beyond base of proboscis; lateral processes well separated; 

 ovigera 5 -jointed (Phoxichilidium) . . . P.femoratum, p. 283 

 B'. First trunk segment projecting somewhat anteriorly beyond base 

 of proboscis ; body concentrated, lateral processes closely ap- 

 proximated (Halosomd) H. viridintestinalis, p. 286 



B". First trunk segment projecting well beyond base of proboscis, 



forming a slender neck ; body elongate, lateral processes well 



separated ; ovigera 6-jointed (Anoplodactylus]. 



C. Caudal segment directed upward . Anoplodactylus erectus, p. 289 



A". Chelifori and palpi both absent ; ovigera present in the male only 



(PVCNOGONIDM]. 



B. Ovigera 9- or zo-jointed (Pycnogonum). 



C. Ovigera xo-jointed Pycnogonum stearnsi, p. 292 



SYSTEMATIC DISCUSSION OF SPECIES. 



PYCNOGONIDA. 

 Family ACHELID^E. 



Chelifori present, chelate in larva but not in adult ; palpi present ; 

 ovigera lo-jointed, present in both sexes. 



Genus Lecythorhynchus Bohm ( ? 79b). 

 Corniger BOHM, '79*, p. 186. 



Trunk rather stout, sutures well defined ; lateral processes rather short, 

 well separated. Caudal segment moderately long, pointed upward. 

 Eye tubercle slightly anterior to middle of first segment, pointed. 

 Proboscis comparatively long, approximately cylindrical. Chelifori 

 either i-jointed (mere knobs) or 2-jointed. 1 Palpi long, 9-jointed. 

 Ovigera ic-jointed. Legs moderately long and stout; first tarsal joint 

 very small ; second tarsal joint stout, curved ; claw strong ; auxiliary claws 

 large. 



Remarks. Bohm first named this genus Corniger, but later, finding 

 that name untenable, 2 changed it to the present one. Besides the species 

 here described, the genus at present includes only the two species recorded 

 by Bohm, both of which came from Japan. 



1 In Lecythorhynchus armatus Bohm. 



2 " Da die Bezeichnung Corntgermdess bereits fiir eine Fischgattung vergeben 1st, so 

 mag dieselbe durch Lecythorhynchus ersetzt werden." Bohm ('79*). 



