5o8 



PYCNOGONIDA 



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

 feeding. 



In Pycnogonum, Phoxichilus, Fhoxichilidium, and their im- 

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



Fig. 270.— Ovigei'ous legs of A, Phoxichilus spinosus, Mont. ; B, Phoxichilidium femor- 

 atum, Rathke ; C, Anoplodactylns petiolatus, Kr. ; D, Colossendeis proboscidetis, 

 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- 

 cMlidium five, Anoplo dactyl us six. 

 Fig. 271.- Terminal joints of oviger- Phoxichilvs scven ; in Paranymplion 



ous leg of Rhynchotliorcuc medi- ■ ^ . ■ r, • ■,^ 



terramus, Gost2.. eight; m Pycuogonum nine, with, 



in addition, a terminal claw ; in the 

 Ammotheidae from seven {Trygaeus) to ten, without a claw ; 

 in Pallenidae ten, with or without a claw ; 

 in Bhynchothorax, Colossendeis, Eurycide, 

 Ascorhynchus, Nymplwn, 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 Bhyncliothorax this ^^\ 272 

 takes the form of a stout toothed tubercle 

 on each joint ; in Colossendeis of several 

 rows of small imbricated denticles ; in 

 Nym^ihon and Pcdlene 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 eiglit joints if we exclude, or nine 



Nymphon 

 brevirostre, Hodge. 

 Terminal joints of 

 ovigerous leg, with 

 magnified "tooth." 



