66 PYCNOGONIDA. 



Fig. 1 1 : The same, from below. 



a. The common ganglionic mass. 



- 12: Larva of the second stage, from below. 



Here and in the following three figures only a small part of the ambulatory legs has b een given. 



- 13: The same, dorsal view. 



- 14: Larva of the second stage, from below. 



- 15: A young one, from below. 



a. a. Newly begun ovigerous legs. 



Fig. 16 17. Pallene brevirostris Johnst. 



Fig. 16: Free larva of the first stage, lateral view. 



a. First pair of embryonal legs; b. second pair of embryonal legs; c. byssus-threads. 



- 17: The same, somewhat reduced, dorsal view. 



a.' a. The byssus-threads from both the chelifori. 



Fig. 1819. Pallene hastata n. sp. 



Fig. 18: Free larva of the second stage, lateral view. 



No trace of embryonal legs are seen here, such as in Pall, brevirostris, but the development 

 is here somewhat more advanced, which may perhaps account for the difference. 

 a. The proboscis. 



- 19: Free larva of the second stage, lateral view. 



The larval stage is here more advanced, near its close. 

 a. The proboscis. 



Fig. 20 29. Nymphon grossipes Fabr. 



Fig. 20: Larva of the second stage, lateral view. 



The ambulatory legs begin to appear, and a byssus-thread is secreted. 



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



The stage considerably more advanced. 



- 22: The fore part of the same, more enlarged. 



a. Byssus-gland. 



- 23: Larva of the second stage, dorsal view. 



The two foremost pairs of ambulatory legs are fully articulated with well developed claws 

 and auxiliary claws, the second pair only want one joint. 

 a. a. The byssus-glands. 



- 24: The same, from below. 



The greater part of the two foremost pairs of ambulatory legs has been cut away. The 

 yolk-mass is seen to continue from the trunk into the ambulatory legs, bordered by the 

 future wall of the stomach. 

 a. a. The byssus-glands ; b. b. first pair of embryonal legs ; c. c. second pair of embryonal legs. 



- 25: The fore part of the same, more enlarged. 



a. The first embryonal leg; b. the second embryonal leg; c. the proboscis. 

 26: Larva of the third stage, dorsal view. 



The development of the fourth pair of ambulatory legs is already pretty well advanced. 



