of the Families Lophogastride and Euphausiide. 457 
antennules remarkably broad and flattened, their 
inner flagella small, the outer greatly developed. 
Antennal scale broadly triangular, breadth subequal 
to length ; inner margin ciliated, outer not ciliated, 
serrated on the edge, serrations four to six. All the 
legs biramose as in other Schizopoda. Telson very 
large and much longer than the uropods; extremity 
narrowly truncate, with a strong spine at each 
corner, between which the termination is serrated 
and furnished with two sete. Outer uropods one- 
OMMLEG. aught ces 5s Bichon hn odo. Sacra EON ee ..» L, typicus. 
Fam. II. Euphausiide. 
PAU Ini MeM SP SST EG UA :.  sialeieyes svete ecialieas4ie stean. cree estas vg ANS 
First legs much longer than the rest............0e000 B. 
A. 
Basal joint of antennules furnished at the extremity with 
an erect, conspicuous, leaf-like appendage ........ Nyctiphanes. 
Basal joint of antennules without any erect leaf-like 
appendage at the extremity .....-.essseeeesse05 Boreophausia. 
B. 
The long first legs having the two terminal joints armed 
with spiniform setae on both margins ............ Thysanoessa. 
The long first legs greatly produced and very slender, 
last joints naked (without any lateral sete), the 
extremity terminating in a bunch of greatly developed 
porrected spines, these spines serrated ............ Nematoscelis. 
Genus NYCTIPHANES. 
A spine on side of carapace behind the middle. Ros- 
trum nearly obsolete, ocular lobes of carapace pro- 
duced into spine-like points. No dorsal spine over 
PASC NON LCISOMU ta oryvu tilt peste << ss) Pavone iret tte ads N. norvegiea. 
No lateral spines on carapace. Rostrum distinct, shortly 
triangular, lobes of carapace over eyes not at all 
produced. A dorsal spine over base of telson .,,. M. Cowchit. 
Genus BOREOPHAUSIA. 
Rostrum narrow, about as long as first joint of anten- 
nules; no spine on the sides of the carapace ; a spine 
over the base of the telson; telson longer than 
RD Nis oan Geheko rants SOY “me. oor oer B. iney-mis. 
