17 
sserdeles smalt og langstrakt, cylindriskt og nmsten overalt 
af ens Brede, eller kim ganske ubetydeligt afsmalnende 
bagtil. Segmenterne er ved skarpt markerede Sutufer af- 
graendsede fra hiuanden, og dot lste, eller Hovedsegmentet, 
neppe synderlig lsengere end de ovrige. Sidefortsatserne, 
der paa lste Segment udgaar omtrent fra Midten, er paa 
de 2 folgende Segmenter rykkede nmrmere deres bagre Del 
og udgaar paa sidste Kropssegment lige fra Enden. De 
er ved betydelige Mellemrum skilte fra hiuanden, af cylin- 
drisk Form og omtrent saa lange som Legemet er bredt. 
Oventil har enhvev af dem lige ved Enden et vel markeret 
tornformigt Fremspring. Hovedsegmentet er forholdsvis 
kort, med det forreste Parti, eller Pandedelen, ligesom hos 
foregaaende Slmgt, kun lidet fremspringende. Paa den 
ovre Side har dette Parti (se Fig. 3 c) en noget buet 
Tvaerforhpining, der er bevrebnet med to temmelig nssr 
sammen stillede tornformige Fremspring. Den forreste 
Kant af Hovedsegmentet danner over Basis af Snabeleu 
en kravefonnig Udvidning, der i Midten viser et lidet Ind- 
snit eller Indbugtning. Halesegmentet (Fig. 3 g) er ikke 
som hos Pycnogonum horizontal! stillet, men alt-id rettet lige 
opad, dannende en ret Vinkel med det ovrige Legeme (se 
Fig. 3 d). Det er omtrent af samme Ltengde som sidste 
Kropssegment, af aflang oval Form og mesten overalt af 
ens Brede. Enden er afstumpet og bierer til liver Side 
en kort Torn, frnstet til en tydelig Afsats. 
0ieknuden (Fig. 3 e), der er beliggende noiagtig i 
Centret af Hovedsegmentets Rygside, er saerdeles hoi, py- 
ramidal eller konislc og ender i en skarp Spids. De 4 
Comem er forholdsvis smaa og ligger mermere Basis end 
Spidseu af 0ieknuden. Til liver Side, lidt hoiere op paa 
0ieknuden, sees et lidet knudeformigt Fremspring, som 
ogsaa forefindes her hos a.ndre Pycnogonider og som at 
Dohrn ansees for et Slags Sandseapparat. 
Snabelen (se Fig. 3 a, 3 c, og 3 d) er af foiholdsvis 
betydelig Storrelse, mere end halvt saa lang som det ov- 
rige Legeme og neppe smalere end dette, samt skraat ned- 
adrettet. Af Form er den cyliudrisk eller noget tendannet, 
med en svag men tydelig Fortykkelse paa Midten, og Spid- 
sen stumpt afkuttet. I hele dens ydre Parti, Ira den medi- 
ane Fortykkelse af, er den besat med spredte, skraat tortil 
rettede fine Torner, der ved Enden bliver tmttere sannnen- 
tramgte. Mundaabningen viser den ssedvanlige trekantede 
Form og er omgivet af temmelig complicerede Lsebepla- 
der, hvis finere Bygning er udtorligt beskrevet i Dohrn s 
VaHrk. Da Snabelen. ligesom det hele avrige Legeme, er 
temmelig gjerniemsigtig, skiintes i dens Tndre mere eller 
mindre tvdeligt det i den bagre Halvdel beliggende com- 
plicerede System af borstebesatte Chitinlister og til h\ ei 
Side af samme 2 sma'le fortil rettede blindsmkformige For- 
lsengelser af Tarmen (se Fig. 3 c). 
Saxlemmer og Folere mangier hos det voxne Dyr, 
ligesom hos foregaaende Slsegt. Dog er der Grand til 
Den norske Nordhavsexpeditiou. G. O. Sars: Pycnogonidea. 
exceedingly slender and elongate, cylindrical, and well-nigh 
j everywhere of the same breadth, or tapers but very 
little posteriorly. The segments are divided from each 
other by sharply defined sutures, and the 1st or cephalic 
segment is not much longer than the others. The lateral 
processes, which on the 1st segment proceed from about 
the middle, on the 2 following segments approach closer 
the posterior part, and issue on the last body-segment 
from the extremity itself. They have wide intervals be- 
tween them, are of cylindrical form, and about as long as 
the body is broad. Above, right at the extremity, each 
has a well-pronounced spiniform projection. The cephalic 
segment is comparatively short, with the anterior section, 
or frontal part, but slightly projecting, as in the preced- 
ing genus. On the upper surface, this part (see 
fig. 3 c) lias a somewhat arched transversal prominence, 
armed with 2 spiniform projections, set close together. 
The anterior margin of the cephalic segment forms, over 
the base of the proboscis, a sort of collar, exhibiting in the 
middle a slight incision, or sinus. The caudal segment (fig. 
3 g) is not placed horizontally, as in Pycnogonum, but al- 
ways directed straight upward, at right angles with the 
rest of the body (see fig. 3 d). It measures about the 
same length as the last body-segment, is of an oblong 
oval form, and has well-nigh everywhere equal breadth. 
The extremity is obtuse, and has on either side a short 
spine, affixed to a distinct ledge. 
The oculiferous tubercle (fig. 3 a), placed exactly in 
the centre of the dorsal side of the cephalic segment, is 
very elevated, pyramidal or conic as to form, and termi- 
nates in a sharp point. The 4 cornea: are comparatively 
small, and lie nearer the base than the point of the oculi- 
ferous tubercle. On either side, a little higher up the 
oculiferous tubercle, is seen a small knob-shaped projection, 
also occurring in other Pycnogouids, and which Dohrn 
takes for a kind of sensory apparatus. 
The proboscis (see figs. 3 a, 3 c, and 3 d) is compar- 
atively large in size, upwards of half as long as, and hard- 
ly at all more slender than, the rest of the body, and 
obliquely directed downward. Cylindric or somewhat fusi- 
form, it has a slight but distinct inspissation in the middle, 
with the point obtusely truncate. Throughout the whole 
of its outer part, from the median inspissation, it is fur- 
nished with distant, anteriorly pointing, delicate spikes, at 
the extremity set closer together. The buccal orifice, 
presenting the usual triangular form, is surrounded by 
rather complicated labial plates, the more intricate struc- 
ture of which Dohrn fully describes in his work. The 
proboscis, in common with the rest of the body, being 
comparatively translucent, we can detect, inwards, more 
or less distinctly, the complicated system of bristle-bearing 
chitinous fillets in the posterior half, and on either side 
2 slender, anteriorly directed carnal prolongations of the 
intestine (see fig. 3 c). 
The chelifori and palpi are absent in the adult ani- 
*mal, as with the preceding genus. Meanwhile, there is 
3 
