26 
At Arten er en segte h0inordisk og arktisk Form 
synes klart saavel af clens ovenfor omtalte geographiske 
Udbredning som af den Omstamdighed, at saagodtsom alle 
Stationer, hvor den under vor Expedition er observeret, 
tilhorer den kolde Area. 
Fam. Alpheidse. 
Gen. Bythocaris, G. 0. Sars, 1869. 
Nye Dybvandscrustaceer fra Lofoten. Vid. Selsk. F orli. 18(SQ. 
Slsegtscharacteristik. Legemsbygningen noget lig 
samme bos Slaegten Hippolyte. Rygskjoldet kort og hvaelvet, 
fortil i Midten dannende en til Siderne tydeligt begrsendset 
noget Revet Pandedel, der ender mod 3 simple fortilrettede 
Fortsatser, hvoraf den midterste forestiller Pan dehornet. 
Sidefortsatserne de enormt udviklede Supraorbitaltorner. 
En Antenne- og Hepatical-Torn tilstede, derimod ingen 
Pterygostomialtorn. Bagkroppen kraftigt udviklet, med 3die 
Segment oventil pukkott'ormigt og bagtil fremspringendo ; 
Epimererne hos Hunnen sterdeles store og afrundcde. 0inene 
smaa. Folerne mesten fostede i samme horizontale Plan; 
lste Par med 2 Svober; 2det Par med sserdeles stort og 
bredt Blad. Kindbakkerne uden Palpe kun forsynet med 
en enkelt cylindrisk, i Enden afstumpet Tyggegren. 3die 
Par Kjsevefedder forsynet yed Basis med en rndimentffir 
Exognath; Stammens sidste Led sammentrykt, skjawt udvi- 
det og bevfebnet med en enkelt Rad af korte Tamder. 1 ste 
Fodpar som hos Hippolyte; 2det Par meget smsekkert og 
svagt, med 9-leddet Tarse. Gjellerne paa hver Side 5, 
hurtigt tiltagende i Storrelse bagtil. Det midterste Hale- 
vedhamg stserkt forlanget. med afstumpet Spids og sasrdeles 
smaa Endetorner. JDe ydre Halevedhsengs Endeplader af 
meget ulige Storrelse. Udviklingen directe, uden Metamor- 
phose. 
Aim. Bern. I Aaret 1869 opstillede jeg denne nye 
Skegt for en eiendommelig af mig paa de store Dybder ved 
Lofoten opdaget Caride, B. simplidrostris, som vistnok i 
sin almindelige Habitus stemmede user overens med Slaegten 
Hippolyte, men som paa den anden Side viste en Del 
maerkelige AtVigelser, der gjorde det nodvendigt at skille 
den generiskt fra hin Slaegt. Senere er 2 forskjellige For- 
mer blevne beskrevne, som aabenbart tilhorer samme Skegts- 
type. nemlig Hippolyte Payeri Heller og Hippolyte Panschii 
Buchholz, og paa vor Expeditions sidste Togt er endnu en 
pragtfuld ny Art af samme Skegt bleven opdaget, nemlig 
den nedenfor naermere beskrevne Bythocaris leucopis Sheg- 
ten taeller altsaa for Tiden ikke mindre end 4 forskjellige 
Arter, som alle i de vsesentligo Characterer stemmer over- 
That the animal in question is a true Arctic form, 
seems manifest, alike Rom its above recorded geographical 
distribution and the fact of well-nigh all the Stations at 
which the species was met with on the Norwegian Expedi- 
tion having belonged to the cold area. 
Fam. Alpheidse. 
Gen. Bythocaris, G. O. Sars, 1869. 
Nye Dybvandscrustaceer fra Lofoten. Vid. Selsk. Fork. ISO!). 
Generic Character. — Structure of body exhibiting 
some resemblance to that in the genus Hippolyte. Carapax 
short and arcuate, forming anteriorly in the middle a distinctly 
defined and rather elevated frontal area, that terminates 
with 3 simple, anteriorly directed processes, the median 
representing the rostrum and the lateral the enormously 
developed supraorbital spines. One antennal and one hepa- 
tical spine present on either side, but no pterygostomial 
spine. Abdomen powerfully developed, with third segment 
hunched above, and projecting posteriorly; epimera in 
female exceedingly large and rounded. Eyes small; an- 
tenna; attached almost in the same horizontal plane; first 
pair with 2 flagella; second pair with an exceedingly large 
[j and broad scale. Mandibles without palps, merely furnished 
with a cylindric masticatory branch, obtuse at the end. 
Third pair of maxillipeds provided at base with a rudi- 
mentary exognath; last joint of stem compressed, obliquely 
’ dilated, and armed with a single row of short teeth. 
First pair of legs as in Hippolyte; second pair exceedingly 
slender and fragile, with a nine-jointed tarsus. Branchiae 
on either side 5, rapidly increasing in size posteriorly. Tel- 
son very elongated, with an obtuse point and exceedingly 
small terminal spines. Terminal plates of uropoda very 
unequal in size. Development direct, without any meta- 
morphosis. 
General Remarks. — In the year 1869 I established 
this new genus, for the reception of a remarkable Caridian 
1 had taken in the great depths off Lofoten, — viz. B. 
simplidrostris, which, in its general habitus, did indeed closely 
agree with the genus Hippolyte, but, on the other hand, 
exhibited a number of striking deviations, that obviously 
called for generic separation from that genus. Since then, 
2 different forms have been described, both clearly belonging 
to the same generic type, — viz. Hippolyte Payeri Heller 
and Hippolyte Panschii Buchholz; and on the last cruise 
of our Expedition we obtained a third new and magni- 
ficent species of the same genus, viz. Bythocaris leucopis, 
described more in detail below. The genus comprises there- 
fore at present as many as 4 different species, all of which 
