REPORT ON THE PYCNOGONIDA. 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 furthermore, 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 (1) that this is the first 
Immovable claw 
WASTAN) cee ac an ar ? A a ae ig aa aan nnn nwenennmrms 3rd coxal joint of the leg 
f Palpus 
POoBO8CI8 — <a-nennesnveen 0 ee 
Ist joint of 
the mandible #¥ 
Cephalic part of the cephalothoracic segment ) 4 
eT Skea ene yf / 2nd tibial joint 
t 
2nd coxal joint 
3rd 
Thoracic part of th 
cephalothoraci: 
Ist tarsal joint -------------- 
2nd thoracic segment 
3rd thoracic segment I} 
2nd tarsal joint.--- 
4th thoracic segment 
Abdomen ...--. = (fe ee 
aM TSN / < ceeeneeaeen Anus 
OvigerOUs Veg ma----o-----------enenn---fof 
2 Claw 
RA ___... Ist tibial joint 
ola 2nd tibial joint 
Nymphon, sp. * 
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 troublesome affair, and that some 
allowance may be made for its incompleteness. 
1 For reasons easily to be understood I have taken a species of Nymphon as the type. 
2 ©, Semper, Ueber Pyenogoniden und ihre in Hydroid-Polypen schmarotzenden Jugendformen., Arbeiten des Zool. 
Zoot. Instituts in Wirzburg, Band i., 1874, 
