508 



PYCNOGONIDA 



CHAP. 



probably also take some part, as Hodgson suggests, in the act of 

 feeding. 



In Pycnogonum, Phoxichilus, Phoxichilidium, and their im- 

 mediate allies they are absent in the female ; in all the rest 



ous leg of Rhynchothorax medi- 

 terraiieus, Costa. 



FIG. 270. Ovigerous legs of A, Phoxichilus spinosus, Mont. ; B, Phoxichilidiuin femor- 

 uti/iii, Rathke ; C, Anoplodactylus petiolatus, Kr. ; D, Colossendeis proboscideus, 

 Sab. 



they are alike present in both sexes, though often somewhat 



smaller in the female than in the male. They are always turned 



towards the lower side of the body, 

 and in many cases even their point 

 of origin is wholly ventral. The 

 number of joints varies : in Phoxi- 

 cliilidium five, Anoplodactylus six, 



FIG. 271. Terminal joints of oviger- Phoxichilus seven ; in Paranymplion 



eight ; in Pycnogonum nine, with, 

 in addition, a terminal claw ; in the 



Ammotheidae from seven (Trygaeus} to ten, without a claw ; 



in Fallenidae ten, with or without a claw ; 



in Rhynchothorax, Colossendeis, Eurycidc, 



Ascorhynchus, Nymphon, ten and a claw. 



The appendage, especially when long, is apt 



to be wound towards its extremity into a 



spiral, and its last four joints usually possess 



a peculiar armature. In Rhynchothorax this FlG - 272 - 



n brevirostre, Hodge. 



one torm ot a stout toothed tubercle Terminal joints of 

 on each joint ; in Colossendeis of several ovigerous leg, with 



magnified "tooth. 



rows ol small imbricated denticles ; in 



X H mi>lion and Pallene of a single row of curious serrate and 



pointed spines, each set in a little membranous socket. 



Legs. The four pairs of ambulatory legs are composed, in 

 all cases without exception, of eight joints if we exclude, or nine 



