_* > a 
Indre Organer. 
Fordgielsessystemet. — Tarmen danner (se Tab. 
XIU, Fig. 1, 2) et simpelt og temmelig vidt, bagtil 
noget afsmalnende Ror, der strekker sig igjennem 
Axen af Legemet, og udmunder, efterat have dan- 
net en kort Endetarm, ved Enden af sidste Hale- 
segment, under Basis af Halepladen. Paa Under- 
siden af dens forreste stumpt afrundede Del munder 
Spiseroret, der er steerkt musculost og stiger lodret 
i Veiret fra Mundaabningen. Dets ovre'Ende sprin- 
ger frit frem i Tarmens Lumen, og viser her en 
eiendommelig klapformig Indretning (se Tab. XII, 
Fig. 10, 11, «), hvorved Tarmens Contenta hindres 
fra at passere tilbage ind i Spiseroret. Med den 
forreste Del af Tarmen forbinder sig et meget com- 
| pliceret leveragtigt Organ, der fylder en stor Del af 
* Hovedet (se Tab. XII, Fig. 1, 2,1). Det bestaar 
af 2 symetriske Halvdele, hver delt i talrige uregel- 
messigt forgrenede Blindsekke (Fig. 3), der er ud- 
kledt indvendig med et Lag af glandulose Celler. 
Alle disse Blindsekke samler sig tilsidst paa hver 
Side til en felles kort Stamme, der munder i den 
forreste Del af Tarmen. Det hele Apparat svarer 
_ utvivlsomt til de 2 forholdsvis simple blindsek- 
formige Udvidninger af Tarmen hos Branchipodi- 
derne. 
_.  Karsystemet. — Hjertet (Fig. 1, 2, c) er af me- 
get langstrakt Form, og streekker sig igjennem hele 
Midtkroppen, fra Mandibularsegment og ind i 1l1te 
fodbeerende Segment. Som sedvanligt, ligger det 
umiddelbart ind under Kroppens dorsale Integument, 
og afsmalnes gradvis forfra bagtil, hvor det synes 
at ende blindt. Fortil har det derimod en vid Aab- 
A ning, hvorigjennem Blodet drives ud i Hovedet og 
._ derfra i Rygskjoldet og den ovrige Krop. For hvert 
. Kropssegment har det et Par venose Spalter, for- 
synede med 2 klapformige, bevegelige Leber, der 
afvexlende Iukker og aabner sig, og hvorimellem 
Blodet optages i Hjertet fra de forskjellige Dele af 
Legemet. I Rygskjoldet finder en meget livlig Blod- 
circulation Sted, og Blodet gjennemstrommer her et 
meget compliceret System af Hulrum, beliggende 
mellem de 2 Lameller, hvoraf Rygskjoldet er sam- 
mensat. Nogen virkelige Blodkar existerer imidler- 
tid ligesaalidt her som hos andre Phyllopoder. 
oat i). 
es - Nervesystemet. — Som hos andre Krebsdyr, be- 
a staar Nervesystemets Centraldele af det ovre Svelg- 
na ganglion, eller Hjernegangliet, og en Bugganglie- 
kjede. Hjernegangliet er meget vanskeligt at un- 
dersoge, da det ligger tet omhyllet af andre Dele. 
Saavidt jeg har kunnet se ved omhyggelig Dissec- 
og af betydelig simplere Bygning end hos Branchi- 
podiderne, uden de hos disse forekommende dorsale 
tion, er det (Tab. XIII, Fig. 5, g) forholdsvis lidet » 
Internal Organs. 
Digestive system. — The intestine (see Pl. XIII, 
figs. 1, 2) is in the form of a simple, rather wide 
tube, slightly tapering posteriorly, and extending 
through the axis of the body; after having formed 
a short rectum, it opens at the end of the last 
caudal segment beneath the base of the caudal 
lamella. On the under side of its anterior, bluntly- 
rounded part, opens the esophagus, which is excee- 
dingly muscular, and rises perpendicularly from the 
oral aperture. Its upper end projects freely into 
the lumen of the intestine, exhibiting there a pecu- 
liar valve-like arrangement (see Pl. XII, figs. 10, 
11, we), whereby the contents of the intestine are 
prevented from passing back into the csophagus. 
With the foremost part of the intestine is connected 
a very complicated hepaticous organ, which occupies 
a great part of the head (see Pl. XIII, figs. 1, 2, 1). 
It consists of 2 symmetrical halves, each divided 
into numerous irregularly ramified ceea (fig. 3), 
which are lined interiorly with a stratum of glan- 
dular cells. All these ceca unite at last, on each 
side, into a short common stem that opens into the 
anterior part of the intestine. The whole apparatus 
undoubtedly answers to the two comparatively 
simple cecum-like expansions of the intestine in 
the Branchipodide. 
Vascular system. — The heart (fig. 1, 2, c) is 
of a very elongated shape, and extends throughout 
the mesosome, from the mandibular segment into 
the 11th pedigerous segment. It lies, as usual, imme- 
diately below the dorsal integument of the body, 
and tapers gradually from the front to the back, 
where it seems to have no outlet. In front, on the 
contrary, it has a wide opening, through which the 
blood is driven out into the head, and thence into 
the carapace and the rest of the body. In each 
segment of the mesosome there are two venous 
ostia, each furnished with 2 valve-like movable lips, 
which alternately open and shut, and through which 
the blood is received into the heart from the diffe- 
rent parts of the body. A very active circulation 
takes place in the carapace, the blood flowing 
through a very complicated system of cavities lying 
between the 2 lamelle of which the carapace is 
composed. Actual blood-vessels, however, no more 
exist here than in other Phyllopoda. 
Nervous system. — As in other crustaceans, the 
central portion of the nervous system consists of an 
upper cesophageal ganglion, or cerebral ganglion, and 
a ventral ganglion chain. The cerebral ganglion is 
very difficult to examine, as it is closely enveloped 
by other parts. As far as I have been able to see 
by careful dissection, it is comparatively small (Pl. 
XIII, fig. 5, g), and of a much simpler structure 
than in the Branchipodide, without the dorsal lobes 
