87 
folgend© Segmenter udtrukne i en tornforcnig tan dot F ort- 
sats< cler er noget skjmvt udadrettet. 4de Segment er det 
stoiste at alle og viser oventil i Midten en dyb Lsengdeiure, 
"orved dets dorsale Del bliver delt i 2 symmetriske Side- 
bltu. Sidste Forkropssegment er noget smalere end det 
oiegaaende, med den bagro Kant dybt udraudet og de til 
' Ll ‘''ble at 1 drandningen udgaaende laterale Fortsatser 
•'tvdelig lsengere end paa de 2 foregaaende Segmenter. 
aa \ entralsiden er (se Fig. 2) de 2 sidstnsevnte Segmenter 
utuldstsendige, idet Kropsvaeggen her indtages at en bled, 
1 dicrusteret Hud, der dog undertiden i Midten viser 2 
svmetriske forkalkede Plader. Helt bagtil bemmrkes des- 
U< 1* n en kort halvmaaneformig buet Plade, der egentlig, 
1,111 a * Prof. Dobrn t'orst paavist, 1 represent erer den vcn- 
tinle Del at et sserskilt Segment. Ved noiere Undersdgelse 
'd man ogsaa hegge M;:erke til. at der mellem For- og 
a gkrop p aa Kygsjden er indskudt en lignende smal Plade, 
p 0m lloi b der Andes mellem Hoved og Forkrop. Denne 
ade er at betragte som den dorsale Del at samme Seg- 
!"* Herved faar man altsaa ud det normale Antal F or- 
kropssegmenter. nemlig 7, bvoraf dog kun de 5 midterste 
1 luldstaendigt udviklede, idet det lste delvis er gaaet op 
® 0 ' 0( lets Dannelse, medens det sidste. ikke blot er ganske 
udinienkert, men endog mangier etbvert Spor at Lemmer. 
j Pagkroppen er meget liden og smal, neppe indtagende 
* at L otalltengden og bestaar egentlig af 6 Segmenter, 
0l ai dog det sidste er omformet paa en eiendommelig 
^ aade, dannede sammen med Halevedhaengene en saakaldt 
Hll| ovit'te. i Ligbed med hvad Tilfmldet er bos Mere Cru- 
Aaceer (Macrurer og Schizopoder). De 5 egentlige Bag- 
ropssogmonter er ganske korte og af ens Ldseende, med 
I s l'idsede og udadrettede Epimerer, der paa de bagerste 
' Vii'iiter synes at vaere dobbelte. Langs ad Rygsi den Andes 
II dobbelt Rad af korte tandformige Fortsatser, hvorved 
11 le denne Kropsdel i Gjennemsnit faar et kantet Ud- 
Se ende. 
0ine mangier, i Modssetning til hvad Tilfeldet er hos de 
' r *go bekjendte Arter, ganske og aldeles, og Integumenterne 
1S( 1 P aa det Sted, hvor disse Organer skulde Andes, ikke 
•nindste Spor af nogen Forandring, liverken hvad F 
arve 
det 
1 ^P'Uctur angaar. 
De 2 Par Folere er fmstede tmt sammen ved de forreste 
i C ^ 1 hjorner at Hovedet. umiddelbart indenfor Supraorbital- 
oi’tsatserne. Do er forholdsvis smaa og indbyrdes omtrent 
I l ' Us L»ngde, men viser et noget forskjelligt Forhold af 
^ eni samniensaittend e Led. 
Par Folere (Fig. 4), der er faestede lige over det 
o et Pa D bestaar af et 3-leddet Skaft og en kort 5-leddet 
‘ v °be. Af Skaftets Led er det sidste stmrkt forlamget og 
j'ssten sa,a langt som de 2 ovrige tilsammen. 2det Led 
* rer V( ‘ d Enden i den ene Kant 2 saakaldte Horeborster. 
arched in the middle, and having the posterior latera 
corners, as in the 2 succeeding segments, drawn out to a 
spiniform, dentate projection, taking a somewhat oblique, 
outward course. The 4th segment is the largest of all. 
and exhibits above, in the middle, a deep, longitudinal sulcus, 
dividing the dorsal part into 2 symmetrical lateral areas. 
The last segment of the anterior division is a trifle nar- 
rower than the preceding one, with its posterior margin 
deeply emarginate, and having the lateral projections jutting 
forth from either side of the emargination considerably 
farther than on the 2 preceding segments. On the ventral 
side (see Ag. 2), the 2 last-mentioned segments are incom- 
plete, the wall of the body consisting here of a soft, 
non-incrusted pellicle, which, however, in some specimens, 
exhibits 2 symmetrical, calcareous plates. Moreover, far 
behind, is observed a small lunate, arched plate, that, strictly, 
as Arst pointed out by Professor Dohrn, 1 represents the 
ventral part of a separate segment. On closer exam- 
ination will also be detected, between the anterior and 
posterior divisions of the body, inserted on the dorsal side, 
a narrow plate, similar to that occurring between the 
head and the trunk. This plate must be regarded as 
the dorsal part of the same segment. Thus, we have the 
normal number of segments belonging to the anterior divi- 
sion, viz. 7, but of which the 5 median only are fully 
developed, the Arst segment going in part to the formation 
of the head, while the last is not only quite rudimentary, 
but fails even to exhibit the slightest trace of limbs. 
The posterior division of the body is very small and 
slender, measuring scarcely one-fourth of the total length; 
it consists, strictly, of G segments, the last transformed in 
a peculiar manner, constituting, as in more highly organized 
Crustaceans (Macrurans and Schizopods), together with the 
last pair of pleopods, a so-termed caudal fan. The 5 true 
abdominal segments are quite short and uniform in appear- 
ance, with pointed and outward-directed epimera, which, on 
the posterior segments, would appear to be double. Along 
the dorsal side, occurs a double series of short, dentiform 
projections, giving to the greater part of this division of 
the body an angulous appearance. 
Eyes entirely wanting, contrary to what is the case 
in all other known species; and the integuments, where 
these organs might be looked for, do not present a trace of 
change, as regards either colour or structure. 
The 2 pairs of antenna; are attached close together, 
at the foremost lateral corners of the head, immediately 
within the supraorbital projections. They are comparatively 
small, and well-nigh uniform in length, but differ somewhat 
in relation to the joints composing them. 
The 1st pair of antenna (Ag. 4), attached immediately 
above the 2nd pair, consist of a three-jointed peduncle and 
a short, Ave-jointed flagellum. Of the joints of the peduncle, 
the last is very considerably produced, being almost as long 
as the 2 others taken together. The 2nd joint bears at 
bntersueliungeu fiber Artliropoden. 
Untersuchungen fiber Arthropoden. 
