5o6 



PYCNOGONIDA 



111 Ammothea and its allies they are extremely rudimentary 

 in the adnlt, being reduced to tiny knobs in Tanystylum and 



Fig. 266. — A, B, Chelophore.s of Axcnrhynchiis dbyssi, G.O.S. A, Young ; B, adult. 

 (After Sar.s.) C, Anterior portion of Ammothea hispida, Hodge, Jersey : late 

 larval stage (=Acheha longipes, Hodge), showing complete chelae. D, Chela of 

 Eiirycide hispida, Kr. 



Trygaeus, and present as small two-jointed appendages in Ammo- 

 thea ; in this last, if not in the others also, they are present in 

 complete chelate form in the later larval stages. 



In Eurycide, Ascorhynchus, and Bar ana they are usually less 

 atrophied, liut yet comparatively small and with imperfect chelae, 

 while in some Ascorhynchi (^A. minutus, Hoek) they are reduced 

 to stumps. 



In Pallenojjsis the scape of the chelophore consists of two 

 joints, as also in Becolopoda and some Ascorhynchus : in Nym-phon, 



Fic. 267. — Chelae of species of Nymphonidae : A, Nyviphon hrevirosire, Hodge ; B, 

 Boreonywphon rohusium. Bell ; C, Chaetiriiymphoii viacronyx, G.O.S. ; D, Nympho'ii 

 elegans, Hansen. 



Phoxichilidium , Pallene, and Cordylochcle of one only ; in all 



"furnished with a pair of distinctly three-jointed mandibles; and the specimen 

 was the largest of the three obtained." 



