155 
igment og vel udviklede Synselementer. Alle Burster 
U( 'ilierede. lste Par Folere med Basalledet af middelmaa- 
( li>A Starrelse, Bisv0ben omtrent lialvt saa lang sum Svdben, 
4-leddot. Be 2 forreste Fodpar med Haanden oval og 
Hriberanden kort saint nedentil begramdset af et stserkt 
tandformigt Fremspring. 5te Fodpars Hofteled pladefor- 
n '*gt udvidet. Sidste Fodpar kort, med Hofteleddet ineget 
'’irtit og bagtil jevnt udbuet. Sidste Par Halefodder med 
^ Ptl ydre Gren forlaenget og sylformigt tilspidset. Hale- 
'Pdhanigot af atlang Form, kloftot til lloden. Farven hvid- 
graa, Lmngden 5 l U mm . 
Findested. Jan Mayen. 
B em.se rkninger. Nmrvarende Form er let kjendelig 
fva all( - saavel til denne sum den fulgende Slmgt h0rende 
Alter ved de tydeligt udviklede, mprkt pigmenterede 0ine. 
ra Ph. Holbolli Kr. kjendes den desuden ved den mere 
uiulersaitsige Kropsform, den kortere og stumpere Pande- 
plade og en noget forskjellig Form paa sidste Fodpars 
Hofteled. 
Beskrivelse af Hunnen. Legemet er (se PL XIII, 
4) forholdsvis meget kort og undersaetsigt bygget, med 
Lied, hvadvet Ryg og temmelig lioie Epimerer. 
Hovedet er omtrent saa langt som de 3 forreste Seg- 
wieiiter tilsammen, oventil svagt hvrelvet og fortil som saed- 
' anligt i’remspringende over Roden af Folerne i Form at 
( d Slags Pandehorn eller rettere Pandeplade. Spidsen at 
denne Pandeplade er mindre nddraget end lios Ph. Holbolli 
°? ovenfra sect sturnpt tilrnndet. 
De 4 forreste Par Epimerer er temmelig store, kjen- 
( b‘Hgt hoiere end solve Kroppen og nedentil (se Fig. 4 d ) 
besat mod nogle simple, ikke cilierede Burster. 4de Par 
5* betydelig bredere end de evrige og bagtil i sin overste 
He] stserkt indskaaret for at kunne optage den forreste 
tu ageformigt udlebende Lap af det folgende Par. 
3die Bagkropssegments Sideplader er temmelig store 
^ bagtil nddragne i en tnngeformig, i Enden afrundet Lap. 
0 3 bagerste Segmenter er meget korte og oventil jevnt 
hvaelvede. 
0inene er lios denne Art meget tydeligt udviklede og 
ar sin Plads som lios andre Amphipoder paa Siderne af 
ov edet, lige over 2det Par Fpleres Fseste. De er af af- 
lu "det Form og forsynede med mprkt Pigment og normalt 
U( lviklede Synselementer. 
lste Par Folere (Fig. 4 a) dsekkes for en Del oventil 
at Pandepladen og feeder frem til liver Side af samme. 
He er forholdsvis korte og undersaetsigt byggede, dog ikke 
1 c *en Grad som hos Ph. Holbolli. Basalleddet er noget 
H'ngere end de 2 folgende Led tilsammen og betydelig 
fjkkere. 2det Led liar i den ene Kant en Rad af stserke 
u cilierede Burster. Svoben er noget kortere end Skaftet, 
with a dark pigment and well - developed visual elements. 
All bristles 11011-ciliated. First pair of antennae with basal 
joint moderate in size; secondary flagellum about half as 
long as true flagellum, ami with 4 articulations. the 2 
anterior pairs of legs with the hand oval and the palmar 
margin short, as also defined below by a prominently 
dentiform projection. Basal joint of 5th pair of legs lamelli- 
form-dilated. Last pair of legs short, with basal joint very 
broad, and uniformly arched behind. Last pair of caudal 
stylets with outer plate elongate and awlshaped- acute. 
Telson oblong in form, cleft to the base. Colour whitish- 
grey. Length 5 1 / 2 H ' m . 
Locality. — Shores of Jan Mayen. 
Bemarks. — Tin- present form is readily distinguished 
from all other species belonging either to this or the suc- 
ceeding genus, by the distinctly developed, darkly pigmented 
eyes. From Ph. Holbolli Kr. the animal may, too, be 
easilv recognized by the more thickset form of body, the 
shorter and more obtuse frontal plate, as also by a some- 
what different shape characterizing the basal joint of the 
last pair of legs. 
Description of the Female. — The body (see PI. 
XIII fin. 4) comparatively very short and thickset in 
structure, with broad, arching back and rather deep epi- 
mera. 
The head is about as long as the 3 anterior segments 
taken together, slightly arcuate above, and as usual projected 
anteriorly beyond the base of the antenum, in the form 
of a kind of rostrum, or rather frontal plate. The point 
of this frontal plate is less produced than in Ph. Holbolli, 
and, when viewed from above, appears obtusely rounded. 
The 4 anterior pairs of epimera are rather large, 
obviously higher than the body itself, and furnished below 
with a few simple, noil-ciliated bristles. The 4th pair are 
considerably broader than the rest, and hindwards deeply 
incised in their upper half, for the reception of the fore- 
most linguiform-protending lobe of the succeeding pair. 
The lateral plates of the 3rd abdominal segment are 
comparatively large, and posteriorly produced to a lingui- 
form, at the extremity, rounded lobe. The 3 posterior seg- 
ments are very short, and uniformly arched above. 
The eyes in this species are very distinctly developed, 
and. as in other Amphipods, placed on either side of the 
head, immediately above the points of attachment for the 
2nd pair of antennae. They are rounded in form, and 
furnished with a dark pigment as also normally developed 
I visual elements. 
The 1st pair of antenme (fig. 4 a) are covered above 
to a great extent by the frontal plate, from either side of 
which they project. They are comparatively short and 
thickset in structure, though not so much so as in Ph. 
Holbolli. The basal joint is somewhat longer than the 2 suc- 
ceeding articulations taken together, and considerably thicker. 
The 2nd articulation has on one of the margins a row of strong 
• 20 * 
