GLANDS 



511 



chilidium, in most I'alleiiidae, in nearly all Nyniphonidae. Their 

 presence or absence is often used as a generic character, helping 

 to separate, e.g., Pallene from Pseudojyallene and Fallenopsis, 

 and PhoxicMlidmm from Anoplodactylus ; nevertheless they may 

 often be detected in a rudimentary state when apparently absent. 

 Tlie legs are smootli or hirsute as tlie body may happen 

 to be. 



Fig. 276. 



-Boreonymphon rohustum. Bell. Male with young, slightly enlarged. 

 Faeroe Channel. 



Glands. — In some or all of the appendages of the Pycnogonida 

 may be found special glands with varying and sometimes obscure 

 functions. The glands of the chelophores (Fig. 280, p. 522) are 

 present in the larval stages only. Tliey consist of a number of 

 flask-shaped cells ^ lying witliin the basal joint of the appendage, 

 and generally opening at the extremity of a long, conspicuous, 

 often mobile, spine (e.g. Ammothea (Dohrn), Pallene, Tanystyhtui 

 (Morgan), Nymphon hrevicollum and iV". gracile (Hoek)). They 

 secrete a sticky thread, by means of which the larvae attach 



^ Meisenheimer (Zeitsch. iviss. Zool. Ixxii., 1902, j). 235) compares these witli 

 certain glands described in Branchijrus by Spangenberg and by Glaus. 



