5o8 



PYCNOGONIDA 



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

 feeding. 



In Pycnogonum, Phoxichilus, FhoxichilicUum, and their im- 

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



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

 (ttum. Ratlike ; C, Auoplodactylus petiolatits, 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, Anoplodcwtylus six, 

 Fig. 271.— Terminal joints of oviger- PhoxicMlus seven ; in Paranymphon 



ous leg of Rhynchothorax 'iiiedi- ■ i j_ • -n • •^^ 



terraneus, Costi eight; m Pycnogonum 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 Rhynclwthorax, Colossendeis, Eurycide, 

 Ascorliynclvus, 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 Bhynchothorax this ^'°- ^7 2. ~ Nymphon 

 takes the form of a stout toothed tubercle 



Terminal joints of 

 ovigerous leg, with 

 magnified "tooth." 



on each joint ; in Colossendeis of several 



rows of small imbricated denticles ; in 



Nymplion 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 vs'ithout exception, of eight joints if we exclude, or nine 



