506 



PYCNOGONIDA 



CHAP. 



In Ammothea and its allies they are extremely rudimentary 

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



FIG. 266. A, B, Chelopliores of Ascorhynchus abyssi, G.O.S. A, Young ; B, adnlt. 



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

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

 Kin-i/f.ide hisjrida, 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 Barana they are usually less 

 atrophied, but yet comparatively small and with imperfect chelae, 

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

 to stumps. 



In Pallenopsis the scape of the chelophore consists of two 

 joints, as also in Decolopoda and some Ascorhynchus : in Nymphon, 



C D 



Fifi. 267. Chelae of species of Nymphonidae : A, Nymphon brevirostre, Hodge ; B, 

 Boreonymphftn robust tnn. Bell ; C, Chudonymphon macronyx, G.O.B. ; D, Nymphon 

 elegatts, Hansen. 



Phoscichilidium, Pallene, and Cordylochele of one only ; in all 



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

 was the largest of the three obtained." 



