70 
dommeligt udviklet Epignatli. Basaldelens lste Led er 
ganake kort, dobbelt saa bredt som langt og er maaske 
egentlig at botragte som Stemaldelen at et sserskilt Seg- 
ment. Dens 2det Led er bredt bagtil. men afsmalnes lrar- 
tigt fortil. idet den ydre Kant er skraat afskaaret: indad 
lober det ud i en oval, i Enden med korte Borster og 
Torner besat Tyggeplade. Palpen er lsengere end Basal- 
delen og alle dens 4 Led lamellose samt i den indre Kant 
besat med indadkrummede Borster. At Leddene er det 
2det storst: sidste Led er skraat afskaaret i Enden og her 
forsynet med 7 boiede Borster. Den maerkvaTcligt udvik- 
lede Epignatli udspringer fra Basaldelens lste Led med en 
tyk. muskulos Stilk og er ligesom Palpen paa lste Par 
Kj aivei ganske skjult i Gjellehulen, hvori den danner et 
Yentilapparat. der veil sine rytbmiske Svingninger frem og 
tilbage underholder en stadig Streaming ai' Vandet i en 
bestemt Retning. Dens ydre Parti dannes at enbred, stmrkt 
buet Plade at oval Form og membranes Beskaffenhed, der 
bagtil ender med et tyndt, smertformigt Appendix. Noget 
loran Midten er denne Plade forsynet med en tydelig Tvier- 
sutur. hvorved den deles i 2 Segmenter. Det foran Suturen 
liggende Segment er i Kanterne meget tint cilieret. Den 
liele Epignatbs Homologi med Gjelleapparatet bos Cuma- 
ceerne er evident saavel ifolge dens Strnctur som Belig- 
genhed og Forhold til Kjievefodderne. 
At F odderne er de 2 forreste Par. ligesom hos Sliegten 
Apseudes, eiendommeligt udviklede. medens de 5 bagerste 
Par er at mere normal Bygning og forestiller de egentlige 
Gangf'odder. 
lste Fodpar (Fig. 17). der udspringer fra den bagerste 
Del af Hovedsegmentet. til liver Side af den for omtalte 
transversale Ohitinplade, er udviklet til saerdeles kraftige 
Griberedskaber i Ligbed med de saakaldte Fangarme hos 
boiere Krebsdyr (Decapoda). De viser en temmelig* stork 
Sformig Krumning og er boiede ind under Forkroppen saa- 
ledes, at cleres Endeparti let kan bringes i Berorelse med 
Mundaabningen. Man kan paa dem adskille 6 Led. kvoraf 
de 2 sidste tilsammen danner en vel udviklet Sax. lste 
Led er stairkt indknebet ved Basis, men derpaa meget op- 
svulmet og f'yldt med kraftige Muskier, der tjener til at 
bevaege den ovrige Del af Foden; det bierer ved Poden 
paa den ydre Side et lidet 2-leddet. med 4 lange cilierede 
Borster endende Appendix (Fig. 19), der aabenbart svarer 
til den saakaldte Exopodit bos boiere Crustaceer (Scbizo- 
poder og Curnaceor). og som vi hos Slsegten Apseudes ogsaa. 
gjenfinder paa det folgende Fodpar. 2det Led er ganske 
og aldeles rudimentsert og saa lidet, at det let undgaar 
Opmaerksomheden, ihvorvel dots Tilstedevserelse med fuld 
Sikkerhed kan paavises. ddie Led er meget smalt, men 
noget udvidet mod Enden og her ved en meget skjfev Sutur 
forbundet med det meste. Dette er omtrent af Basalled- 
dets Lsengde, men betydelig smalere, noget sammentrykt 
fra Siderne og i den nedre eller indre Kant forsynet med 
4 stserke Borster. Den folgende Del af Foden, der fore- 
and a peculiar-developed epignath. The 1st joint of the 
basal part is quite short, twice as broad as long, and should, 
perhaps, strictly, be regarded as the sternal portion of a 
separate segment. The 2nd joint is broad posteriorly, rap- 
idly tapering however anteriorly, the outer side being ob- 
liquely truncate; inward, it protends as an oval masticatory 
plate, beset at tlie extremity with short bristles and spines. 
The palp is longer than the basal part, and has each of 
its 4 joints lamellar, and armed along the inner margin 
with incurving bristles. Of the joints, the 2nd |is the 
largest; the terminal joint is obliquely truncate at the ex- 
tremity, where it has 7 curving bristles. The remarkably 
developed epignatli takes its origin on the 1st joint of 
the basal part, as a thick, muscular stem, and. like the 
palp on the 1st pair of maxillae, is entirely concealed 
within the branchial cavity, where it forms a ventilatory 
apparatus, which, by rhythmical vibrations backward and 
forward, produces an uninterrupted current of water in a 
given direction. Its outer part is composed of a broad, 
very considerably arcuate plate, oval in form and of a mem- 
branous character, terminating posteriorly with a narrow, digi- 
tiform appendix. A little anterior to the middle, this plate 
exhibits a distinct transverse suture, dividing it into 2 seg- 
ments. The segment in advance of the suture is very finely 
ciliated along the margins. The homology of this epignath 
with the branchial apparatus in the Cumacea is indisputably 
apparent, alike from the structure of the organ and its 
position and relation to the vnaxillipeds. 
Of the legs, the 2 foremost pairs exhibit, as in the 
genus Apseudes, a very peculiar development, whereas the 
o hindmost pairs are more normal in structure, and represent 
the true pereiopoda. 
The 1st pair of legs (fig. 17), springing from the 
posterior part of the cephalic segment, on either side of 
the previously mentioned chitinous plate, are, like the 
so-called chclipeds in more highly developed Crustaceans 
(Decapods) exceedingly powerful prehensile organs. They 
exhibit a, comparatively strong S-shaped curve, and are 
bent in under the body, so as to readily admit of their 
terminal part being brought in contact with the buccal 
orifice. They are composed of l> joints, the last two form- 
ing together a well-developed chela. The 1st joint is very 
much constricted at the base, from thence however greatly 
swollen, containing as it does the powerful muscles that 
serve for moving the other part of the leg; it bears at 
the base, on the outer side, a small, two-jointed appendix, 
terminating in 4 long, ciliated bristles (fig. 19), which ob- 
viously correspond to the so-called exopodite in more highly 
developed Crustaceans (Schizopods and Cumaceans), and 
that, in the genus Apseudes, we also observe on the suc- 
ceeding pair of legs. The 2nd joint is quite rudimentary, 
and so very small that it easily escapes observation, though 
its presence can be determined with perfect certainty. The 
3rd joint is exceedingly slender, but somewhat dilated to- 
ward the extremity, where a very oblique suture connects 
it with the succeeding one. The latter is about equal in 
length to the basal joint, but much more slender, somewhat 
) 
I 
