47 



af en tyk muskulos Basaldel og en raed denne be- 

 vægeligt forbunden og stærkt indljoiet Endedel. 

 Denne sidste har Formen af et triangulært Blad. 

 der paa sin frie, lige afskaarne Rand er besat med 

 en Kække af stive Borster, tiltagende i Længde 

 indad. Enhver Børste bestaar (Fig. 7) af en noget 

 tykkere Basaldel besat i den ene Kant med grove 

 Pigge, og en i en fin Spids udlobende, og i begge 

 Kanter tæt cilieret Endedel. — Andet Par Kjæ- 

 ver (Fig. 8) er langtfra saa kraftigt udviklede og 

 synes heller ikke ifolge sin Stilling at kunne spille 

 nogen væsentlig Rolle ved Næringsoptagelsen. De 

 udspringer (se Fig. 1, m'-) lidt bag Iste Par og er, 

 ganske i Modsætning til hine, rettede udåd. Basal- 

 delen har paa den nedre Side 3 tykke Fjærbørster. 

 Endedelen synes kun at være lidet bevægelig og 

 viser en noget oval Form. Dens udadvendte Side 

 er tæt besat med stive, kort cilierede Borster, der 

 staar i flere Rækker og divergerer til alle Sider. 

 Den forreste Borste er noget grovere end de ovrige 

 og fæstet i nogen Afstand fra disse til et kort 

 Fremspring. 



Branchialfodderne (se Tab. VII, Fig. ',)— 13) er 

 alle udpræget bladformige og af temmelig bred Form, 

 med den forreste Flade noget hvælvet og den ba- 

 gerste mere eller mindre concav. Man kan paa dem 

 adskille de samme Hoveddele, som allerede ovenfor 

 er beskrevne paa Branchialfodderne hos Nebalia. 

 Basaldelen eller Stammen er af aflang Form og 

 næten ens Brede overalt. I dens Indre sees for- 

 skjellige hinanden delvis kr\'dsende Muskelbundter, 

 der dels tjener til at boie selve Stammen, dels vir- 

 ker ])aa de forskjellige Vedhæng. Stammens ydre 

 Kant er noget fortykket og viser ved Basis nogle 

 svagt> lud- og Udbugtninger som en Antydning til 

 en Slags ufuldstændig Leddeling. Dens indre Kant 

 er delt i 5 korte Lappe, de saakaldte Enditer, hvoraf 

 den bagerste, eller øverste, er meget bred og langs 

 sin halvmaaneformigt buede Rand besat med en tæt 

 Ra<l af kamformigt ordnede og stærkt krummede 

 Borster, alle fint cilierede og bestaaende af 2 tyde- 

 lige Led (se Fig. 10). De øvrige Lappe er meget 

 mindre, næsten af mammilledannet Form, og besat 

 med lignende krummede Børster, samt desforuden 

 foran dem med et Knippe betj'delig grovere saa- 

 danne. Endopoditen (end), der danner den umiddel- 

 bare Fortsættelse af Stammen, er forholdsvis gan.ske 

 kort og har Formen af en bred triangulaT, noget 

 indadrettet Plade, besat langs Yderkanten med stærke 

 Fjærbørster, der ved Spidsen og langs den indre 

 Kant efterhaanden antager Characteren af korte 

 Tome, cilierede kun i den ene Kant. E.\opoditen 

 (ex), der er bevægeligt articuleret til eu særegen 

 Afsats af Stammen ved Ydcrsiden af Endopoditen, 



pair (Pl. VII, fig. G consist of a thick, musculous 

 basal part, and a strongly incurved terminal part 

 connected movably with it. The last-named has the 

 form of a triangular lamella which, upon its free, 

 straightly truncated margin, is beset with a series of 

 stiff bi'istles, increasing in length inwards. Each 

 bristle (fig. 7) consists of a somewhat thicker basal 

 part, beset on the one edge with coarse spikes, and 

 a terminal part wliicli runs out in a fine point and 

 is closely ciliated on both edges. — The second pair 

 of maxillæ i^tig. S) are far from being so power- 

 fully developed, and neither do they, from their 

 position, apjjear to play any material part in the 

 securing of nourishment. They issue (see tig. 1 m.-) 

 a little behind the 1st pair, and are, quite in con- 

 trast to tiiem, directed outwards. The basal i)art 

 has ?> thick plumose Ijristles on the lower side. The 

 terminal part appears to be only little mobile, and 

 exhibits a somewhat oval form. Its outwardly turned 

 side is closely beset with stiff, short ciliated bristles 

 placed in several series, and divergent to all sides. 

 The foi'emost bristle is somewhat coarser than the 

 others, and is attached at some distance from them 

 to a short ])rojection. 



The branchial feet (see PI. VII, figs. d—Vd) are 

 all prominently foliaceous and of pretty broad 

 form, with the foremost surface somewhat convex, 

 and the backmost one more or less concave. AVe 

 can distinguish in them the same chief parts as 

 have already been described above concerning the 

 branchial feet of Nebah'a. The basal part or stem 

 is of an oblong shape, and almost uniform in breadth 

 throughout. In its interior may be seen various 

 bundles of muscles ])artly traversing each other, 

 which serve partly to bend tlie stem itself, partly 

 act on tlie various appendages. The outer edge of 

 the stem is somewhat thickened, and at the base ex- 

 hibits a few faint in- and out- curvatunjs, as an 

 indication of a kind of imperfect articulation. Its 

 inner edge is divided into a short lobes, the so-called 

 endites, of whicli the backmost or uppermost one 

 is very broad, and along its semi-lunary arcuate _ 

 margin is beset vrith a close series of strongly 

 curved bristles arranged like a comb, all finely cili- 

 ated and consisting of '2 distinct joints (see fig. 10). 

 The otlier lobes are much smaller, almost mammilli- 

 form in shape, and beset witli similar curved brist- 

 les, and besides, in front of them, with a fascicle of 

 considerably coarser setæ. Thi> endopodite (end) 

 which forms the immediate continuation of the stem, 

 is. comparatively, quite short, and has the form of a 

 broad triangular, somewhat incurved plate, beset 

 along the outer edge with strong plumose setæ, 

 which at tlie tip and along the inner edge succes- 

 sively assume the character of short spines, ciliated 

 only on the one edge. The exopudite (ex) which is 



