PYCNOGONIDA. 9 
to either of them, and so I agree with Sars in not using unnecessary appellations, taken from the 
Årachnida or other Arthropoda. There is thus no reason to call one of the joints patella. 
First tarsal joint (ar7Zzculus tarsalis prior), fig. 1 ta". 
Sars: Tarsalled (tarsus). 
Second tarsal joint (47Zzculus larsalis alter), fig. 1 Za-. 
Sars: Fodled (propodus). 
These two tarsal joints are closely united like the two tibial joints; often they are almost 
uniform without any particular difference as to length or structure. If there is any difference, it con- 
sists most frequently in the first joint being shortened, often much shortened in contrast to the second 
one. If we should choose to distinguish between the joints, and give each of them a separate name, 
I think that appellations as metatarsus and tarsus would be proper; but to avoid too many names 
and all confusion with the appellations of Sars, I have only numbered the joints. The names given 
by Sars, seem to me to be too unfortunate at all events; the name of tarsus meaning always the 
outermost joint, or — if the tarsus is divided — joints of the leg. 
Claw (479%), fig. 1 %. 
Sars: Endeklo (unguis terminalis). 
The claw, as mentioned above, is only the last terminal joint of the leg (corresponding to the 
claw in the larva of the Staphylinids and of most Coleoptera), but is not included in the foot. It 
is very much varying as to shape and size, often in the same genus (for inst. in Co/ossenders); as it 
cannot be mistaken for any other claw, I have thought it unnecessary to use a more particular 
appellation. 
Auxiliary Claws (wrguicult auxtliares), fig. I wa. 
Sars: Bikløer (unguiculi auxiliarii). 
These auxiliary claws are really the terminal claws of the foot, originating from and attached to 
the last joint (the claw) of the foot. In so far they are real claws, and correspond to the claws in the 
Arachnida and most Insects. Corresponding claws are wanting in the Crustacea, and therefore their 
presence in the Pycnogonida is of no small systematic importance; it is to be remarked, however, that 
they often become rudimentary or quite disappear, but nevertheless they may be said to be typical in 
this group of animals. As to their importance in assisting the claw, it evidently cannot be great, and 
therefore their Latin name of auxiliares or auxiliarii is not very appropriate. 
Palp (palpus v. pes palpiformis), fig. 1 plp. 
Linné: antennæ; O. Fabricius: antennæ; Latreille: palpes ; Leach: palpi; Savigny: 
pedes tertii; Lamarck: antennules; Johnston: palpi; Milne-Edwards: palpes; Erichson: zweites 
Kieferpaar, Maxillen, Tasten; Krøyer: Palper; later: first pair of jaws or Maxiller (maxillæ primi 
paris); Wilson: palpi; Bøhm: Palpen; Hoek: palpes; Hansen: Palper; Sars: Føler (palpi). 
After Latreille, more particularly, perhaps, founded on his theory of the proboscis being 
formed by a composition of gnathites, having introduced the appellation palpes for the word antenna 
used by Linné, this name (palpi—palpes) has now been used by almost all later authors; some 
(Erichson, Krøyer) have thought, however, that this pair of limbs do not correspond to the 
palps of the other Arthropoda only, but to the whole corresponding pair of guathites, and have named 
The Ingolf-Expedition. IIL 1. = 
