68 PYCNOGONIDA. 



10: The same, lateral view. 



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

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



- 1 1 : Larva of the second stage, lateral view. 



f. 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. n. 



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



first ambulatory leg; f. the second ambulatory leg. 



Fig. 13 14. Nymphon spinosum 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. Cheliforus; 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. a. The chelifori ; b. b. the palps ; c. c. the ovigerous legs. 



Fig. 15 16. Nymphon elegans Hans. 



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



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

 The letters as in fig. 13. 



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



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

 leg; d. the proboscis; e. the first ambulatory leg; f. the second and third ambulatory leg; 



g. byssus-gland. 



Fig. 17 18. Nymphon Sluiteri 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; e. the 

 first ambulatory leg ; f. the second ambulatory leg ; g. 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; c. c. the second pair of embryonal 

 legs; d. the proboscis; c. the ganglionic mass for the embryonal legs; f. the ganglion of the 

 first segment of trunk; g. the whole ganglionic mass for the rest of the trunk. 



Fig. 19 21. Nymphon longitarse 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 embryonal legs; d.d. the byssus-glands. 



