

\II>\ 



ntinuations of the embryonal leg mj part I must regard it as .t decided I 



mida the embryonal legs are quite thrown off during the second 

 and that thej are in no way identical with the later imaginal i 

 limbs, the palps and the ovigerous legs, which lattei also, and of this there is no 



although on the same metameres, still in other parts of these m i 

 meres. The tw<> genera mentioned here, Pallt ■//<■ and Pseudopallene y also show that even if greater 

 rudiments of the embryonal legs are found in the first larval stage, these rudiments bave 

 quite disappeared in the second stage, so that here no trace oi limbs is found, from which a new 

 pment might arise 

 The second larval stage of Phoxichilidium shows, in accordance with the parasitical habits of 

 the animal, a quite particular development I have myself only had the first stage for examination; 

 but as this larva has repeatedly been the object of thorough examinations, I may nevertheless, relying 

 on these examinations, give a short survey of the development of its second stage, founded <>n the 

 representation b) •'.. Adlerz, Bidrag till Pantop. MorphoL r.888, especially referring to his figures 

 j in the two accompanying plates. The second larval stage then begins with the disappearing 

 of both pairs of embryonal legs, so that only slight traces or remnants are left After a coup. 

 moultings, during which the rudimentary remnants of the legs by and by quite disappear, the imagin- 

 al limbs are begun, in the common way and in the common order, without, however, breaking 

 through the outer, common, wrapping membrane, until all the traces of the embryonal legs have dis- 

 appeared. Adlerz now supposes the foremost pair of imaginal fore limbs 1II1 i. e the palps, to be 

 in, cp. his fig. i<>, upon which follows the further development of this pair of limbs in fig. 11 and 

 : (pi. I); but in the first place the genus Phoxichilidium as imago has upon the whole no palps 

 igerous legs are found in the male), and next both pairs of fore limbs arise from the 

 if the animal in the waj common in Arthropoda, by the growth of a little cellular mass, 

 while Adlerz makes the extremity II develop as the other limbs of the Pycnogonida, especially the 

 ambulati 1". a swelling of the sides of the blastoderm or the ectoderm. According to this I 



not take the small tubercles illi on the side of the trunk to be the future ovigerous legs. Neither 

 I have any great confidence in the representation or interpretation by Adlerz of the ganglionic 

 string in Phoxichilidium, cp. his fig. 4, pi. I; at all events, it does not agree well with his figun 

 the ring in Nymphon Slroemii, which latter figure I take to be correct In my opinion the 



11 ug which lie interprets as undre svaelggangliet (the nether pharyngeal ganglion), and from 

 which a nei en to branch off to the extremity II (it ought to be extr.III, as the former extre- 



mity is wanting in all Phoxichilidia), must be the ganglion from the first segment ol the trunk plus 

 the inglia from the metameres of the embryonal legs, or, as it might also be called, the 



nethermost ■ 'lion, Vccordingly I think that after the description of this larva by Adlerz 



either here to be found any continuity between the second pair of embryonal legs and the ovige- 

 ile. 



venf. 1874, who, like Adlerz, takes it to be the second extremity 



to a little protuberance (beyond which, for the rest, it never passes) 



the dii bv identifying the first pair of ambulatory legs with the completely 



