74 



Segmenter. Paa Midtkroppen bærer derimod livert 

 Segment kun et enkelt Par Fodder, og de er ker 

 ogsaa langt kraftigere ndviklede (see Tab. XI, Fig 2), 

 visende idethele, naar nndtages Iste Par, Charac- 

 teren af ægte Griberedskaber, vel skikkede til at 

 gribe og fastholde den Næring, hvoraf Dyret lever. 

 Forovrigt er disse forres^te Par, ligesaavel som de 

 bagerste, forsynede med de 2 cbaracteristiske ydre 

 Vedhæng, Exopodit og Ejnpodit, der begge synes 

 at .staa i Eespirationens Tjeneste. Foddernes Åntal 

 er ialt ikke mindre end 63 Par. 



Iste Fodpar (Tab. XII, Fig. 1, p \ Fig. 14) skil- 

 ler sig kjendeligt i sitUdseende fra de følgende Par, 

 og er ogsaa ialmindelighed mere ndadrettede, saa at 

 de delvis overrager Rygskjoldets Sidekanter. De 

 bestaar imidlertid af de samme Hoveddele som de 

 øvrige Fødder. Selve Stammen viser en mere eller 

 mindre tj^delig Segmentering. Xavulig er der paa 

 ilidten af samme en meget distinct Ledfoining, der 

 deler Stammen i en indre og en ydre Del, dannende 

 med hinanden en noget knæformig Boining. Den 

 indre Del af Stammen har, som paa de ovrige Fød- 

 der, ved Basis en vel iidviklet og meget .skarpt 

 sondret CoxaUap, der er rettet lige indad og besat 

 paa sin stumpt afrundede Ende med talrige korte 

 Pigge og fine, indadkrummede Børster. Af de saa- 

 kaldte Enditer er kun den inderste fæstet til denne 

 Del af Stammen, medens de 3 øvrige ndgaar fra 

 dens ydre Afsnit. De har alle Formen af forholds- 

 vis smale, næsten traadformige Fortsatser, grovt 

 sagtakkede i Kanterne og delvis visende en utyde- 

 lig Leddeling. Den 4de eller yder.ste Endit er dob- 

 belt saa lang som den 1 ste og omtrent af Stammens 

 halve Længde. Ved Basis af denne Endit er der et 

 ubetj-deligt lancetformigt Fremspring, der repræsen- 

 terer Eiidimentet af den paa de øvrige Fodpar me- 

 get kraftigt udviklede 5te Endit. De 2 ydre Ved- 

 hæng er begge forholdsvis smaa. Epipoditen (ep) 

 har Formen af en afrundet oval Lamelle, der ved 

 en kort Stilk er fæ.stet til Stammens Yderside om- 

 trent ved dennes knæformige Bøining. Exopoditen 

 (ex), der udspringer i kort Afstand fra Epipoditen 

 længere udåd, er ligeledes pladeformig, men betyde- 

 lig mindre og af iiregelmæssig trekantet Form, idet 

 den er udtnikket i 2 Flige, hvoraf den j'derste er 

 mest fremspringende og rundt om kantet med fine 

 Børster. 



2det Fodpar (Fig. 15) er adskilligt stærkere byg- 

 get end Iste, og skiller sig desuden væsentlig ved 

 Forholdet af Enditerne. Disse er nemlig kortere og 

 stærkere, næsten kloformige, og mangler ethvert 

 Spor af Leddeling, skjøiidt de viser i begge Kanter 

 et Antal af smaa, med fine Pigge besatte Afsatser. 

 Den yderste eller 5te Endit, der paa l.'^te Par kun 



than there are segments. On the mesosome, on 

 the other hand, each segment carries only a 

 single pair of legs, which are also much more 

 pov(-erfully developed (see PI. XI, fig. 2), exhibiting, 

 on the whole, with the exception of the first 

 pair, the character of true grasping organs, well 

 fitted for seizing and retaining the food on which 

 the animal lives. The anterior, as well as the pos- 

 terior pairs, are furnished with the two charac- 

 teristic external appendages, exopodite and epipo- 

 dite, which both appear to serve as organs of respi- 

 ration. The niimber of legs in all is no less than 

 63 pairs. 



The fir.st pair of legs (PI. XII, fig 1, p ', fig. 14) 

 is conspicuously distinguished in appearance from 

 the succeeding pairs, and is also generally directed 

 more outwards, so as partially to project over the 

 lateral edges of the carapace. These legs consist, 

 however, of the same principal pai'ts as the other 

 legs. The stem itself shows a more or less distinct 

 segmentation. In the middle of it, notably, there 

 is a very distinct articulation, dividing it into a 

 proximal and a distal jmrt, which form with each 

 other a somewhat genicnlated flexure. As in the 

 other legs, there is, at the base of the proximal 

 portion of the stem, a well-developed and very 

 sharply defined coxal lobe, directed straight inwards, 

 and furnished at its bluntly rounded extremity with 

 numerous short spines, and fine, incurved bristles. 

 Of the so-called endites, only the innex-most is 

 attached to this part of the stem, while the other 

 3 issue from its distal section. They all have the 

 form of comparatively narrow, almost filiform pro- 

 cesses, coarsely serrated at the edges, and jjartly 

 showing an indistinct segmentation. The fourth, or 

 outermost endite is twice as long as the first, and 

 about half the length of the stem. At its base, 

 there is a lanceolate projection, which represents 

 the rudiment of the powerfully developed .oth endite 

 on the other legs. The two oiiter ajipendages are 

 both comparativel}^ smaU.. The epipodite (ep) is in 

 the shape of a rounded oval lamella, attached by a 

 short peduncle to the outer side of the stem at 

 about the genicnlated bend. The exopodite (ex) 

 which issues at a short distance from the epipodite, 

 farther out, is also lamellar, but considerably 

 smaller, and of an irregularly triangular shape, 

 being drawn out into two lobes, of which the outer 

 is the more prominent, and is edged all round 

 with fine bristles. 



The 2nd pair of legs (fig. 15) is far more .strongly 

 built than the first, and is, in other respects, prin- 

 cipally distinguished by the relations of the endites 

 to one another. These are shorter and stronger, 

 almost claw-like, and devoid of every trace of seg- 

 mentation, although they exhibit at both edges a 

 number of small serrations clothed with fine spinules. 



