67 
triangulsere. skarpt begrsendsede Lapper, dor forestiller 0ien- 
loberne. Lige bag disse d aimer Hovedskjoldet nedad til 
bver Side en dyb I'drandning. indenfor livilken Kindbak- 
kerne og Overlseben traeder frit frem (se Fig- 6), medens 
det lsengere bagtil boier sig om paa Bugfladen i beam at 
- uregelmtessigt firkantede Flige. der mellem sig indsluttei 
de ovrige Munddele. Disse Flige dakker sarnmen med 
Hovedskjoldets bagre Sidedele til bver Side eu tydelig Hule. 
bvori 2 eiendommeligt inodificerede \ edhseng til Munddelene 
rager frem. Did bagerste og storste at disse "V edbasug daxmei. 
80111 nedeufor menu eve skal vises, et compliceret Ventil- 
apparat. veil bvis Bevmgelser en stadig' Strpmning at Van- 
det i Retningen bagfra fortil underholdes i de mevnte Hulei. 
Indgangsaabningerne til disse Huler ev beliggende ved Basis 
at Kjievefodderne. medens U dgangsaabningerne bgger loran 
de omtalte Flige. mellem disse og Ivindbakkemes Ooipoia. 
Det hel» (;r. saaledes som af Fritz Muller bos felaegten 
lanais paavist, utvivlsomt at betragte som et Respirations- 
a pparat og bar sit fuldstsendige Homologon i Cumaceeims 
Djellehulleix skjondt paa langt naer ikke opnaaende disses 
maegtige Udvikling. Lige bag Kjaweffidderne sees paa Bug- 
sulen en ganske smal transversal Cbitinplade, der aabenbart 
forestiller Sternaldelen af det forovrigt ganske med Hoi edi t 
Sfuiniionvoxede 1st fodbaerende Segment. Til Siderne af 
denne Cbitinplade og undddelbart indenfor en kort fra 
Hovedskjoldet udskvdende tungeformig Fortsats er Saxiod 
dorne fsestede. 
At tydeligt begrsendsede Forkropssegmenter tindeslige- 
SOni bos de ovrige til denne Gruppe bprende Former kun 
idet det lste fodbserende Segment, som antort. saagodt 
s °m ganske er gaaet op i Dannelsen af Hovedskjoldet. Det 
lste at disse frie Segmenter er meget last og, som det 
s J r nes. ubevaegeligt forbundet med Hovedsegmentet, I >et er 
noget bredere end dette. med jevnt afrundede Sidedele. og 
er bagtil stierkt udrandet til Optagelse af den smale forreste 
Hel af 2det Segment. Dette og de felgende Segmenter er 
betydelig smalere og ved dybe Indsnoringei* skilte fra hm- 
a nden. De bar alle (se Fig. 2) meget smaa. med de til- 
svarende Lemmer forbundne og fra selve Segmenterne skarpt 
adskilte Epimerer. De til lste Segment liOrende er storst, 
llu ‘ n ikke som lios Slsegten Apseudes forlamget til fortd- 
le ttede Torner. 
Bagkioppen, der indtager omtrent 1 /a af Totalkengden, 
bestaar af 6 tydeligt begrsendsede Segmenter. livorat de o 
forreste ev ganske korte og i hjri Grad ud marked.' ved de 
triangulsert tilspidsede og til Siderne udstaaende Epimerer. 
der giver denne Kropsdel et eiendommeligt saugtakket 1 d- 
seende. Sidste Segment er i Enden stumpt afrundet og 
ll0 get lajngere end de 2 foregaaende tilsammen. 
Egentlige 0ine mangier ganske. Tlii indenfoi de smaa 
occupying the lateral corners of the cephalic shield, are seen 
2 triangular, sharply defined lobules, representing the ocular 
lobes. Immediately posterior to these lobules, the cephalic 
shield forms below, on either side, a deep emargination. within 
which the mandibles and the labrum are seen freely protend- 
ing (fig. 3). while, farther behind, it bends round the ventral 
surface in the form of 2 irregular-quadrate lappets, enclosing 
the rest of the oral appendages. These lappets, along with 
the posterior lateral portions of the cephalic shield, cover, 
on either side, a conspicuous cavity, into which 2 peculiarly 
modified appendices of the oral parts are observed to 
project. The larger and more posteriorly placed of these 
appendices, constitutes, as will be shown in the sequel, 
a complicated ventilatory apparatus, by the movements ol 
which an uninterrupted current of water is made to flow 
in a postero-antero direction through the aforesaid cavities. 
The entrance-apertures to these cavities are located at the 
base of the maxi'llipeds. whereas the outlet-apertures occur 
anterior to the above-mentioned lobules. — viz. between the 
latter and the corpora of the mandibles. The whole ar- 
rangement must, as shown by Fritz M tiller to be the case 
in the genus Tanais, unquestionably perform the functions 
of a respiratory apparatus, and has its perfect analogue in 
the branchial cavities of the Cumacca. though far from 
attaining their prodigous development. Immediately posterior 
to the maxillipeds are seen on the ventral side an exceed- 
ingly narrow, transversal, chitinous plate, manifestly repre- 
senting the sternal portion of the 1st pedigerous segment, 
which, for the rest, is quite connate with the head. On 
the sides of this chitinous plate, and immediately anterior 
to a short, linguiform projection jutting out from the cephalic 
shield, are attached the chelipeds. 
Of well-defined thoracic segments, occur, as in the 
other forms belonging to this group. 6 only, the first pedi- 
gerous segment being, as stated above, almost entirely con- 
founded with the cephalic shield. The 1st of these free 
segments is exceedingly firm. and. it would appear, immov- 
ably connected with the cephalic segment. It is somewhat 
broader than the latter, with uniformly rounded lateral 
parts, and has posteriorly a deep emargination. to receive the 
narrow foremost part of the 2nd segment. This and the 
succeeding segments are considerably narrower, and separated 
bv deep instrictions from one another. They have all of them 
(see fig. 2) exceedingly small epimera, connected with the 
corresponding appendages and distinctly separated from the 
segments themselves. Those on the 1st segment are largest, 
but not. as in the genus Apseudes, produced to anteriorly 
directed spines. 
The posterior division of the body, measuring about 
one-fourth of the total length, consists of 6 well-defined 
segments, of which the 5 foremost are quite short, and 
conspicuously distinguished by the epimera, triangularly 
pointed and projecting toward the sides, which gives to this 
part of the body a characteristic serrate appearance. The 
terminal segment is, at the extremity, obtusely rounded, and 
somewhat longer than the 2 preceding ones, taken together. 
Eves, in a strict sense, are entirely wanting. For. 
a* 
