i:»2 T\GE SKor.snKnr, 



and llif liasiil spines arc very iiiih li nduccd. I (cusallx -dislall) (Hi lln' srcdiid lu tlii' ri^lilli 

 juints tluTO is a clustor of ratlirr loiiu. tine liairs. I'] ti d >> pud i l r: The end jnint is lallu'f 

 ilocidedlv curved and is soniewliat more than liall tlir Icii^tli ol tlic scciind joiiil ; il can he loldcd 

 back against a corresponding furrow on tlie seconil joint. The lirst joint has no bristles aX ail. 

 The second joint has (always?) three bristles ventrally at al)out two-thirds or three -qunrters 

 along the joint. The end joint has a single bristle [)roximall\- on the outside; this bristle is of 

 about uniform thickness and is rounded distally. 



Ma i(d i ble: — 



Female: — This is rehitively short, but is very powerfully built, with its joints 

 decidedly flattened at the sides. The proportions between the joints are about the sanu^ in all 

 the species iiivestigatetl by me ami arc illustrated by the following figures (from measurements 

 carried out on a specimen of A. norveqica, 9): 



I Pr. ;;,;; 11 I'r. ^j; 1 End. l,'; 11 Knd. ;:; 111 Knd. ~. 



Protopodite: Coxale: This has no bristles. The endite issues from, or perhaps it would 

 be more correct to say forms basally, a chitinous list, which extends transversely across the joint; 

 of. G. 0. Sars, 1887, pi. IV, fig. 4. The scythe-shaped process is uniformly and moderately 

 strongly curved in two planes, partly^ upwards, partly inwards, and is, in addition, slightl}' 

 twisted so that its medial side is turned somewhat upwards; it is thus turned towards the mouth, 

 in which I often found it inserted (already observed by G. W. MOt.LER; cf. 1894, p. 46). On the 

 distal part of its ventral edge there is always a more or less strongly developed spine, pointing 

 proximally, characterized by the fact that it is continued by a low ridge, in most cases rather 

 short, on the lateral side of the process. This ridge forms a curve which is concave proximally 

 and is furnished, like the spine, with a close series of rather short, tine, stiff spines, pointing 

 proximally. Proximally of this spine there is along the ventral edge of the process a nund)er 

 — in most cases rather small — of protuberances or spines; these are most frequently somewhat 

 different in number and type in different species; within the species they are certainly not 

 constant, but their variation is not so great that they cannot to some extent serve as a character 

 for the species; I often found them rather strongly worn, which may, of course, modify their 

 appearance considerably. From some of these spines a series of low protuberances runs in 

 a dorso-proximal direction on the lateral side of the process; in a number of species these pro- 

 tuberances are rather numerous, in others they are more or less sparse; in addition they are 

 also subject to some variation within the species. Distally of the middle the dorsal edge is often 

 serrated along, in most cases, a rather short part; the teeth vary in size, in some species they 

 are even almost completely reduced. The dorsal edge is, in addition, distinguished by a single 

 bristle, in most cases rather long, which is situated almost f)pposite or somewhat distally' of the 

 above-mentioned proximally pointing spine on the ventral edge of the process. On a great part of 

 the surface of the process there are numerous striations, generally .speaking parallel to each other, 

 of which the distal ones at least are furnished with close, extremely short and fine hairs pointing 

 distally; these hairs are scarcely perceptible even with very strong magnification (Reichbiit's 

 oc. 4, Leitz's immers. ^). Similar striations, running across the process in distally concave 



