GLANDS 



511 



chilidium, in most Palleuidae, in nearly all Nymphoniclae. Their 

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

 to separate, e.g., Palhne from Pseudojiallene and Pcdhnopsis, 

 and Phoxichilidium from Anoplodactylus ; nevertheless they may 

 often be detected in a rudimentary state when apparently absent. 

 The legs are smooth or hirsute as the body may happen 

 to be. 



Fig. 276.— Bore07iymphon rohuslum. Bell. Male with yoxuig, 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. They consist of a number of 

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

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

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

 (Morgan), Nymphon hrevicoUum and K gracile (Hoek)). They 

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



> Meisenheiraer [ZeitscJi. wiss. Zool. Ixxii., 1902, p. 235) compares these with 

 certain glands described in BrancUpus by Spangenberg and by Glaus. 



