18 



med en regelmæssig Rad af temmelig lange, fint 

 cilierede Randbørster. 



De 8 Par Branchialfodder, som umiddelbart 

 følger after Kjæverne, er alle byggede efter samme 

 Type og ligger tæt ind mod liinanden i Form af 

 tværstillede Plader, noget mere convexe fortil end 

 bagtil (se Tab. II, Fig. 1). De tiltager noget i Stør- 

 relse indtil 4de Par og aftager saa igjen succes.sivt 

 bagtil. Paa dem alle kan man (se Tab. III, Fig. 

 3 — 6) adskille 3 fra en fælles Ba.sis ndgaaende Ho- 

 veddele, som vi, i Lighed med hvad man pleier 

 hos andre Krebsdyr, kan beuævne : Endopodit (p), 

 Exopodit (ex) og Epipodit (ep). Den fælles Basaldel 

 bestaar, som paa 2det Par Kjæver, af 2 ufuldkom- 

 ment sondrede Segmenter, der i Inderkanten har en 

 dobbelt Rad af Børster, hvoraf de paa Iste Segment 

 delvis udmærker sig ved betydelig Længde. Endo- 

 poditen (p), der danner den umiddelbare Fortsættelse 

 af Basaldelen, danner en mod Enden successivt af- 

 smalnende Stamme, paa hvilken der er en svag An- 

 tydning til Segmentering. Denne Del er hos den 

 ægbærende Hun betj'delig stærkere forlænget end 

 hos yngre Individer af begge Kjøn og har sidste 

 Led vel sondret, noget ombøiet og besat med sær- 

 deles lange divergerende Fjærbørster, der delvis 

 rager frem nedenfor Rygskjoldets Valvler (se Tab. I, 

 Fig. 1 ). Forovrigt er Endopoditen langs hele Inder- 

 kanten besat med Børster, der fordetmeste er ord- 

 nede i en dobbelt Rad og umiddelbart fortsætter de 

 paa Basaldelen forekommende Børsterækker. Exo- 

 poditen (ex), der er fæstet til Basaldelens 2det 

 Segment, udenom Endopoditen, har Characteren af 

 en bred, langs Midten med en noget fortykket 

 Ribbe forsynet Plade, noget forskjellig i Form paa 

 de forskjellige Branchialfodder. Paa Iste Par (Tab. 

 III, Fig. 3) er den regelmæssig oval og i Yderkanten 

 besat med en Rad af circa 18 tynde Børster, til- 

 tagende i Længde mod Spidsen. Paa de følgende 

 Par (Fig. 4, 5) bliver den successivt noget større og 

 stærkere udvidet i Enden, som er skjævt afrundet 

 og kun besat med faa og spredte Randborster. Paa 

 sidste Par endelig (Fig. 6) har den antaget en tem- 

 melig smal elliptisk Form. Eiiipoditen (ep), der ved 

 en kort Stilk er fæstet til Ydersiden af Basaldelens 

 Iste Segment, er af særdeles betydelig Størrelse, saa 

 at den mere eller mindre fuldstændigt dækker de 

 øvrige Dele, naar disse Lemmer sees in situ fra 

 Ydersiden (se Tab. II, Fig. 1). Den har Formen af 

 en elliptisk eller næsten halvmaanedannet Plade og 

 gaar ud i en dorsal og en ventral Lap, adskilte i 

 Midten ved en tværs over Epipoditen fra dennes 

 Fæste loljeiide fortykket Ribbe. Ligesom Tilfældet 

 var med Exopoditen, er der ogsaa nogen Forskjel i 

 Epipoditens Størrelse og Form paa de forskjellige 



than the inner one and scarcely extends beyond its 

 1st joint. It has the form of a very narrow elli])- 

 tieal lamella which, along the entire inner mar- 

 gin and at the point, is furnished with a regular 

 series of pretty long finely ciliated marginal bristles. 

 The 8 pairs of branchial legs which immediately 

 succeed the maxillæ, are all constructed on the same 

 type, and lie close in. to each other in the form of 

 transversally placed lamellæ, rather more convex in 

 front than behind (see PI. II, fig. I). They increase 

 somewhat in size as far as to the 4th ])air and then 

 gradually diminish backwards. In all of them 3 

 chief portions issuing from a common base (see PI. 

 Ill, figs. 3 — (j) may be distinguished, which we, like 

 what we are accustomed to do with other crusta- 

 ceans, may tei'm endopodite (p), exopodite (ex) and 

 epipodite (ep). The common basal part consists, as 

 in the 2nd pair of maxillæ, of 2 imperfectly .sepa- 

 rated segments which have a double series of brist- 

 les on the inner margin, of which those on the first 

 segment are distinguished by their great length. 

 The endopodite (p) which forms the immediate con- 

 tinuation of the basal part forms a trunk, dimi- 

 nishing gradually towards the extremity, upon which 

 there is a faint indication of a segmentation. This 

 part is, in the ovigerous female, considerably more 

 prolonged them in young individuals of both sexes, 

 and has the terminal joint well separated, s.omewhat 

 recurvate and beset with particularly long divergent 

 and plumose bristles, which partly project below the 

 valves of the carapace (see PI. I, fig. 1). The endo- 

 podite is, otherwise, beset with bristles along the 

 entire inner margin, which are chiefly arranged in a 

 double series, and are immediate continuations of 

 the bristle series appearing on the basal part. The 

 exopodite (ex), which is attached to the 2nd seg- 

 ment of the basal part, outside the endopodite, has 

 the character of a broad lamella, furnished along the 

 middle with a somewhat thickened rib, and is a little 

 different in form in the various branchial legs. In 

 the 1st pair (PI. Ill, fig. 3) it is regularly oval and 

 beset on the outer edge with a series of about 18 

 slender bristles increasing in length towards the point. 

 In the succeeding pairs (figs. 4. 5) it becomes gradu- 

 ally somewhat larger and more strongly expanded 

 at the point, which is unevenly rounded and beset 

 with only few and scattered marginal bristles. Fin- 

 ally, in the last pair (fig. 6) it has assumed a pretty 

 narrow ellipti(!al form. The epipodite (ep); which is 

 attached by a short stem to the outer side of the 

 1st segment of the basal pai't, is of particularly 

 large size, so that it more or less completely covers 

 the remaining parts when those appendages are 

 viewed in situ from the outer side (see PL II, fig. 1). 

 It has the form of an elliptical, or almost semilunar 

 plate, and passes out into a dorsal and a ventral 

 lobe divided in the middle by a thickened rib which 



