XXI 



CHELOPHORES, PALPI, ETC. 



507 



and chelophores of 

 < 'ordylochele longi- 

 collis,G.O.S. (After 

 Sars.) 



these the terminal portion or "hand" forms a forcipate "chela," 



of which the ultimate joint forms the " movable finger." In 



some species of Nymphon the chela is greatly 



produced and attenuated, and armed with 



formidable serrate teeth on its opposing edges : 



in others it is shortened, with blunter teeth; 



in Boreonymphon robust um the claws are 



greatly curved, with a wide gape between. 



In this last, and in Phoxichilidium, the oppos- 



ing edges are smooth and toothless. In Cordy- FIG. 268. Proboscis 



lochele the hand is almost globular, the movable 



finger being shortened down, and half enclosed 



by the other. 



Palpi. The second pair of appendages, or palps, are absent, 



in' all but absent, in the adult Pycnogonum, Phoxichilus, /'//.//'- 



cli Hid in in , Pallene, and their allies. In certain of these cases, 



*.</. Phoxichilidium, a knob remains to mark their place : in 



others, e.g. Pallenopsis, a single joint remains; in a few Pallenidae 

 a sexual difference is manifested, reduction of the 

 appendage being carried further in the female than 

 in the male. The composition of ihe palps varies 

 in the genera that possess them. In .Y// //>/>////. 

 there are five joints, and their relatixe lengths 

 (especially of the terminal ones) are much used 

 l)y Sars in defining the, many species of the genus. 

 The recently described rr<tn ///n/i/nm. Caullery, has 

 palps of six or seven joints. In the Ammotheidae 



Fro. 269. /;/////- the number of joints ranges 1'nnu five or six in 



tide hispida, T<i in/xti/l n m to nine (as a rule) in Ammothea and 

 Kr., showing 



stalked pro- OorJiynchus, or ten, according to Dohrn, in certain 



boscis and zig- S p ec i (>s o f j,,, ,,,//,,. ( ',>/iixxrinfi'< and the K\1TJ- 



zag palps. 



cididae have a ten-jointed palp, which in this last 

 family is very lon^ and bent, in /ig/ag fashion, as it is, hy ihe way, 

 also in Ammo/ /ii'<i. The terminal joints of t he palp are in all cases 

 more or less setose, and their function is conject urally ladile. 



Ovigerous Legs. Custom sanctions for these organs an 

 inappropriate name, inasmuch as it is only in the males that, 

 they perform the function which the name connotes. 1 The\ 



1 As a rare r\rrpt ion, Hock lia.- found the <'gK s <"irrird on tin 1 o\ i 

 a single female of .Yi/nrji/mit lircricaudatum, Mi'-is. 



n 



