10 PYCNOGONIDA. 
it according to this opinion (Kiefer, Maxiller). In Dohrn, Adlerz and Schimkéwitsch it of 
course becomes Extrem. 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 (Co/Zos- 
sendes). 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 Åscorhynchus tridens 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 over), fig. 1 po. 
Linné: tentacula pectoris; O. Fabricius: pedes spurii (fila ovifera); Latreille: pattes; later 
(Régn. an. éd. II): fausses pattes; Leach: organa ovifera; Savigny: pedes quarti; Johnston: ovife- 
rous legs; Milne-Edwards: appendices pediformes; Erichson: drittes Kieferpaar; Krøyer: andet 
Par Kjæber, Æggetraad; Wilson: accessory legs; Bøhm: Eitråger; Hoek: pattes oviféres; Hansen: 
pedes ovigeri; Sars: falske Fødder (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. Fabricius. 
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 im the male. Besides I have in different species of Nym- 
phonidæ (Wymphon groenlandicum mn.sp. pl. III, fig. 204; Pallene hastata n.sp. pl. IV, fig. 174) 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 
im 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, 
