THYSANOPODA CRISTATA. 211 
is medium sized, seen from behind (fig. 1f) considerably curved at the middle, 
with the convex margin outwards and with the end compressed; seen from the 
inner side (fig. 1g) the proximal half is besides a little curved, while a somewhat 
short terminal part of the distal half is a little widened, very oblong, subacute 
and bent to the left. The proximal process (p*.) overreaches considerably the 
terminal; it is proportionately not thick at the base and tapers gradually towards 
the other obtuse end; its distal third is very slender; it is curved somewhat 
inwards at the end of its proximal fourth, while its distal half constitutes a 
portion of a circle with the convex margin inwards. The median lobe (Im.) 
is long and about its distal fourth is nearly lamellar; this lobe is produced dis- 
tally with the tip rounded, and the lamellar part is bent inwards, covering, 
seen from behind, the distal part of the lateral process. This process (p*.) is 
very long, a little curved to the beginning of its terminal fifth, which is much 
curved inwards and especially forwards and in reality considerably longer than 
seen on the figures (figs. le and 1h) as these do not exhibit the process from the 
inner side. The additional process (fig. 1h, which shows both the lateral and 
the additional process seen from in front) is situated at the base of the lamellar 
part mentioned; it is short, somewhat oblong, very thick to near the end which 
is acuminate, acute, and somewhat curved. The auxiliary lobe (lu.) is somewhat 
short. The setiferous lobe (Is.) is nearly lanceolate with the end rounded and 
with setae along both margins to their base. 
Length of the adult male 38 mm., of the two other specimens respectively 
23 mm. and 18mm. Sars’s type measures 48 mm. in length. 
Remarks.— In 1907 I compared the largest specimen in the Agassiz col- 
lection directly with Sars’s type in the British Museum and found that they 
agree perfectly with each other. Consequently Sars’s figs. 15-16 are inaccurate 
in various particulars of the carapace and the antennular peduncles. Sars 
figured the rostrum bent downwards, but this is quite accidental, as the ros- 
trum is articulated to the frontal plate or broken at the base (see above). 
Furthermore his fig. 15 exhibits a cervical groove and other furrows on the 
anterior half of the carapace, but they do not exist, while he did not draw the 
two short lateral impressions really existing and shown in my figures. He 
figured the dorsal keel a little higher than in his specimen, and he overlooked 
the denticle above the lateral margin somewhat from its posterior end. The 
antennular peduncles are not well drawn in his figures. Finally, his statement 
on the length of his specimen (he states it to be 55 mm.) indicates that he here, 
and probably elsewhere in his work, measured the animal from the end of the 
