﻿PYCNOGONIDA. 



EXPLANATION OF THE PLATES. 



Tab. I. 



Fig. I — 4. Pyciuxjoiuiiu lillontlc vStroin. 



Fig. I : Fir.st beginning of tlie embryo, from below. 



The proboscis and tlie three pairs of eml:)r\onal limbs are seen as low tubercles. 



— 2: The embr\'0, somewhat more acU'anced, 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 clea\ing as the beginning 

 of the fingers of the chela or hand. 



— 3: Lar\-a of the first stage, from below. 



— 4: L,ar\-a of the third stage, dorsal \-iew. 



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

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

 j^airs of the ambulator)- legs have all their complete number of joints. 



Fig. 5 — 6, Pho.iichilidiiint fcinordtmn 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 \-iew. 



The outermost joints of the embr\-onal limbs lia\'e been cut off. 



Fig. 7 — 9. Psemlopallene spinipcs Fabr. 



Fig. 7 : Lar\'a of the second stage inside the egg, lateral view. 



Ver\- early stage of development. No trace of embr\onal legs. 

 ti. Chelifori ; />. foremost pair of ambulator\- leg.s. 



— 8: The same stage, lateral view. 



Somewhat more advanced; in this specimen the rudimeutar\- embryonal legs are seen. 

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



— 9: Free lar\-a of the second stage, lateral \'iew. 



Here (only in this .specimen?) no trace of embr\(inal legs are seen. The by.s.su.s-thrcads are 

 now found. 



Fig. 10 — 15. Pscnd(>i>(tUcue rirciildris (loods. 



Fig. 10: Free lar\-a of the second stage, lateral \iew. 



(/. First jiair of emliryonal legs; />. .second pair of cndiryonal legs; c. the byssns-gland. 



The lngolf-F.\|u-ilitiori. IH. 1. 



9 



