EEPORT ON THE rYCNOGONIDA. 



13 



Pycnogonids may be found in the list of the species hitherto described, which I append 

 to this report. I have tried to make it as complete as possible ; yet it contains many 

 species of which no information is given as to the depth at which they were found ; others 

 of which even the locality they inhabit is not accurately stated; and futhermore, there 

 are genera and species — and of the latter no small number — about which we are totally 

 left in the dark. To explain this the reader must keep in mind (l) that this is the first 



Inimovablf claw 



Movable claw 



■^f^IPj.'^.l'-..- 3ril cosal joiat of the leg 

 , Paliftis 



Proboscis 



Cephalic part of the cephalothorncic segment 



Isb 



2ud cosal joiut 

 3rd 

 Thoracic part ot the' 



cephalothoracic seErmen 



lat tarsal joiut 



2nd thoracic sfgment 



3rd thoracic segment 



2n<\ tarsal joint 



4//i thoracic segrnmil 



Abdnmen 



Claw 



lateral processes for the iu^eittuu of the k^s 



Ovigerous Ug 



. 2nd tibial joint 



Nymiilion, &\>. * 



attempt to make such a list, with the exception of a very incomplete and superficial 

 enumeration published in 1874 by Semper/ and (2) that there is as yet no paper 

 published which discusses the relative value of distinguishing marks. So it is evident 

 that the making of this list has been an exceedingly troul)lesome affair, and that some 

 allowance may be made for its incompleteness. 



' For reasons easily to be understood I have taken a species uf Nymphon as the type. 



2 C. Semper, Ueher Pycnosoiiiden und ihre in Hydroid-Polypeu sohmarotiieuden Jugendformeu. Arheiten des ZoiA. 

 Zoot. Instituts in AViirzbury, Band i., 1874. 



