﻿PyCNOGONIDA. 



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

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



First tarsal joint (arlicuhts tarsalis prior)^ fig- i ''<'''• 



Sars: Tarsalled (tarsus). 



Second tarsal joint [niiiculus larsalis al/rr], fig. i fa^. 



Sars: P'odled (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 an}- difference, it con- 

 sists most frequently in the first joint being shortened, often much shortened iu 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 man}' names 

 and all confusion with the appellations of Sars, I have only ntimbered the joints. The names given 

 b}' Sars, seem to me to be too unfortunate at all e\ents; the name of tarsus meaning ahva}s the 

 outermost joint, or — if the tarsus is divided — joints of the leg. 



Claw (luig/iis), fig. i ii. 



Sars: Endeklo (unguis terminalis). 



The claw, as mentioned above, is onl\- the last terminal joint of the leg (corresponding to the 

 claw in the larva of the Staph}-linids and of most Coleoptera), but is not included in the foot. It 

 is very much var}'ing as to shape and size, often in the same genus (for inst. in Colossendcis); as it 

 cannot be mistaken for an}- other claw, I ha-s-e thought it unnecessar}- to use a more particular 

 appellation. 



Auxiliary Claws (tn/oiu'ciili cvixiliares), fig. i i(a. 



Sars: Bikloer (unguiculi auxiliarii). 

 These auxiliary claws are reall}- the terminal claws of the foot, originating from and attached to 

 the last joint (the claw) of the foot. In so far the}- are real claws, and correspond to the claws in the 

 Arachnida and most Insects. Corresponding claws are wanting iu the Crustacea, and therefore their 

 presence in the P\-cnogonida is of no small s^-stematic importance; it is to be remarked, howe\-er, that 

 they often become rudimentar}- or quite disappear, but ne\-ertheless they may be said to be typical in 

 this group of animals. As to their inqDortance in assisting the claw, it evidently cannot be great, and 

 therefore their Latin name of auxiliares or auxiliarii is not \-er}- appropriate. 



Palp (pnlpKs V. pes palpiforiiiis), fig. i pip. 



Linne: antenna;; (3. Fabricius: antennae; Latreille: palpes ; Leach: palpi; Savigny: 

 pedes tertii; Lamarck: antennules; Johnston: palpi; ^lilne-Edwards: palpes; Erichson: zweites 

 Kieferpaar, IMaxillen, Tasten; Kroyer: Palper; later: first pair of jaws or :Maxiller (maxilke jirimi 

 paris); Wilson: palpi; P.ohm: Palpen; Hoek: palpes; Hansen: Palper; Sars: Foler (palpi). 



After Latreille, more particularly, perhaps, founded on his theory of the j^robo.scis being- 

 formed by a composition of gnathites, having introduced the apiK-Uation 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 onl}-, but to the whole corresponding pair of gnathites, and liave named 



The Ingolf-E.Kpedition. III. i. 



