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PYCNOGONIDA. 



— lo: The same, lateral view. 



a. The cheliforus; a', duct of the byssiis-gland ; b. the first embryonal leg; c. the second em- 

 bryonal leg; d. the proboscis; c. the byssus-gland. 



— II : Larva of the second stage, lateral view. 



/ The three foremost ambulatory legs. The other letters as in the preceding figure. 



— 12: Larva of the second stage, lateral view. 



An older phase than fig. 11. 



a. Cheliforus; b. the first embryonal leg; c. the second embryonal leg; d. the proboscis; r. the 



first ambulatory leg; /C the second ambulatory leg. 



Fig. 13 — 14. Nymphon spinosuin Goods. 



Fig. 13: Larva of the second stage, lateral view. 



The larva is in a very early phase of the second stage, still lying in the egg-shell, and 

 with the foremost pair of ambulatory legs only short and still unjointed. 



a. Ch alitor us; a', duct of the byssus-gland; b. the first embryonal leg; c. the second embryonal 

 leg; d. the first ambulatory leg; e. byssus-gland;/ egg-shell. 



— 14: Larva of the third stage, from below. 



The embryonal legs and the byssus-threads have fallen off, but the articulation of the ima- 

 ginal fore limbs has begun. Of the fully developed ambulatory legs only one leg of the 

 second pair is kept. 

 a.ff. The chelifori; b. b. the palps; c. c: the o\-igerous legs. 



Fig. 15 — 16. Niimplwn elegans Hans. 



Fig. 15: Free larva of the first stage, lateral view. 



The beginning of the second stage is marked b\- the appearance of the byssus-threads. 

 The letters as in fig. 13. 



— 16: Larva of the second stage, lateral view. 



(7. Cheliforus; a', duct of the byssu.s-gland; b. the first embryonal leg; c. the second embryonal 

 leg; d. the proboscis; c. the first ambulatory leg; /. the second and third ambulatory leg; 

 g. byssus-gland. 



Fig. 17 — 18. Xijmphoii Slaiteri Hoek. 



Fig. 17: Larva of the second stage, lateral view. 



a. Cheliforus; b. the first embryonal leg; c. the second embryonal leg; d. the proboscis; r. the 

 first ambulatory leg; /C the second ambulatory leg; ^^. beginning of the third ambulatory leg. 



— 18: The same, from below. 



Of the ambulatory legs only the basal end is kept. 



a. a. The chelifori; b. b. the first pair of embryonal legs; r. r. the second pair of embryonal 

 legs; d. the proboscis; r. the ganglionic mass for the embryonal legs; yC the ganglion of the 

 first segment of trunk; £■, the whole ganglionic mass for the rest of the trunk. 



Fig. 19 — 21. Nymphon longilarse Kr. 



Fig. 19: Larva of the first stage, dorsal view. 



a. a. The chelifori; a', a', the ducts of the byssus-glands; b. b. the first pair of embryonal legs; 

 c: c. the second pair of embrj'onal legs ; d. d. the b\'ssus-glands. 



