PYCNOGONIDA. 65 



EXPLANATION OF THE PLATES. 



Tab. I. 



Fig. 1 — 4. Pycnogonum littorale Strom. 



Fig. 1: First beginning of the embryo, from below. 



The proboscis and the three pairs of embryonal limbs are seen as low tubercles. 



— 2: The embryo, somewhat more advanced, from below. 



The embryonal legs are seen as long appendages , all resembling each other, with the only 

 exception that the foremost pair show at the point an indistinct cleaving as the beginning 

 of the fingers of the chela or hand. 



— 3: Larva of the first stage, from below. 



— 4: Larva of the third stage, dorsal view. 



The embryonal limbs have all been thrown off, bnt the eyes are distinctly seen on the fore- 

 most, somewhat constricted part of the first segment of the trunk, and the three foremost 

 pairs of the ambulatory legs have all their complete number of joints. 



Fig. 5 — 6, Phoxichilidium femoratum Rathke. 



Fig. 5: Larva of the first stage, from below. 



The proboscis is not distinctly marked off, but seems to be a continuation of the trunk; 

 byssus-threads wanting. 



— 6: The same, dorsal view. 



The outermost joints of the embryonal limbs have been cut off. 



Fig. 7 — 9. Pseudopallene spinipes Fabr. 



Fig. 7: Larva of the second stage inside the egg, lateral view. 



Very early stage of development. Xo trace of embryonal legs. 

 a. Chelifori ; b. foremost pair of ambulatory legs. 



— 8: The same stage, lateral view. 



Somewhat more advanced; in this specimen the rudimentary embryonal legs are seen. 

 a. First pair of embryonal legs; />. second pair of embryonal legs. 



— 9: Free larva of the second stage, lateral view. 



Here (only in this specimen?) 110 trace of embryonal legs are seen. The byssus-threads are 

 now found. 



Fig. 10 — 15. Pseudopallene eireiihuis Goods. 



Fig. 10: Free larva of the second stage, lateral view. 



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



The Ingolf-Expedition. III. I. 9 



