10 PYCNOGONIDA. 



it according to this opinion (Kiefer, Maxiller). In Dohrn, Adlerz and Schimkewitsch it of 

 course becomes Bxtrem. II. As I, as well as Dohrn, reject the theory of Latreille, I have retained 

 the name of palps. 



The palps are the first pair of the imaginal fore limbs; they do not arise, until the embryonal 

 legs have been thrown off, and have no continuous connection with the latter. They always originate 

 from the anterior edge of the lower side of the first segment of the trunk, often at a great distance 

 from the ovigerous legs; but when the segment is shortened they approach the ovigerous legs, even 

 so far as to apparently originating from the lateral process, on which those legs are inserted (Colos- 

 sendeis). It is to be supposed that they are of no great importance in the life of the animal, and 

 they also form the pair of imaginal limbs, which are liable to the greatest changes as to length, number 

 of joints etc., and soonest become rudimentary or are thrown off. In Ascorhynchus (ridens I have in 

 the fourth joint of these limbs found a particular organ of sense (?); as to details see the following 

 section on the ovigerous legs. 



Ovigerous leg (pes ovifer], fig. i po. 



Linne: tentacula pectoris; O. Fabricius: pedes spurii (fila ovifera); Latreille: pattes; later 

 (Regn. an. ed. II): fausses pattes; Leach: organa ovifera; Savigny: pedes quarti; Johnston: ovife- 

 rous legs; Milne-Edwards: appendices pediformes; Erich son: drittes Kieferpaar; Kroyer: andet 

 ParKjaeber, ^ggetraad ; Wilson: accessory legs; Bohm: Eitrager; Hoek: pattes oviferes ; Han sen: 

 pedes ovigeri; Sars: falske Fodder (pedes spurii). 



The most common appellations of this second pair of imaginal fore limbs are owing to the 

 fact that they are used for carrying the eggs. Another starting point may he found in the peculiar 

 position of these limbs, as seemingly they can be classed neither among the gnathites nor among the 

 ambulatory legs, a fact already pointed out by O. Fabriciiis. 



The ovigerous legs are the latest developed limbs, even if their development takes place only 

 a little later than that of the palps. They arise on a level with and behind the palps on a particular 

 process, but their position in relation to the palps, especially with regard to distance , has already been 

 mentioned. They are of a more considerable length and most frequently have more joints than the palps. 

 The number of joints is typically ten, exclusive of the claw, that is to say, one more than the number 

 we arrive at in the ambulatory legs, when in these we count the claw as a joint, and consider the 

 auxiliary claws as corresponding to the claw of the ovigerous legs. Their most important function is 

 in the male to carry the eggs , for which purpose some of the joints are often thickened or provided 

 with particular hair-formations especially in the male. Besides I have in different species of Nym- 

 phonidse (Nymphon groenlandicum n. sp. pi. Ill, fig. 20 ; Pallene hastata n. sp. pi. IV, fig. 170) and as 

 well in the male as in the female, found in the fourth joint of these limbs an inner organ consisting 

 of a lengthened bag, divided, as it were, into two parts by a constriction in the middle; this bag is 

 by long ligaments of connective tissue, arising from its anterior and posterior end, attached to the 

 exoskeleton; a broad nerve runs along the longitudinal side of the bag. No doubt this bag is an 

 organ of sense, I suppose, of hearing. In the Ascorhynchus quite a similar organ is found, only that 

 in this animal it is not found in the ovigerous legs, but in the palps (cp. above). But besides ser- 

 ving as bearers of the eggs in the male and bearers of an organ of sense, they serve, as I suppose, 



