PYCNOGONIDA. 



to either of them, and so I agree with Sars in not using unnecessary appellations, taken from the 

 Araehnida or other Arthropoda. There is thus no reason to call one of the joints patella. 



First tarsal joint (articulus tarsalis prior), fig. i fa 1 . 



Sars: Tarsalled (tarsus). 



Second tarsal joint (a rt '/cuius iarsalis alter), fig. i fa 2 . 



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 (t<)?gitis), fig. i u. 



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 Staphyliuids 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 Colossendeis); as it 

 cannot be mistaken for any other claw, I have thought it unnecessary to use a more particular 

 appellation. 



Auxiliary Claws (unguiculi auxiliarcs), fig. i ua. 



Sars: Bikloer (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 

 Araehnida 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 palfiiformis), fig. i pip. 



Linne: antennas; O. Fabricius: antennae; Latreille: palpes ; Leach: palpi; Savigny: 

 pedes tertii; Lamarck: autennules; Johnston: palpi; Milne-Edwards: palpes; Erichson: zweites 

 Kieferpaar, Maxillen, Tasten; Kroyer: Palper; later: first pair of jaws or Maxiller (maxillae primi 

 paris); Wilson: palpi; Bolim: Palpen; Hoek: palpes; Hansen: Palper; Sars: Foler (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 Linne, this name (palpi — palpes) has now been used by almost all later authors; some 

 (Erichson, Kroyer) 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 gnathites, and have named 



The Ingolf-Expedition. III. t. 2 



