1886.] MR. R. COLLETT ON BALANUPTERA BOREALIS. 259 
The corpus emerges almost without any transition from the neck, 
and hasa length of about 19 millim., making the animal’s total length 
about 25 millim. It is perfectly cylindrical, and has a regular 
breadth of about 34 to 43 millim., which is thus to the total length 
as 1 to about 63. 
Males and females were intermixed and seemed to be present in 
equal numbers. The two sexes do not appear to differ in length, 
colour, or general appearance ; though the males were at the first 
glance distinguishable on account of the two projecting folds in the 
skin encircling the outer orifice of the genitalia. 
The females were all full of myriads of eggs : these were of normal 
structure, and measured about 0°135 millim. in length; no trace of 
the row of spines which appears on the head of the embryo of the 
other species could be found when magnified 600 times. Neither 
were spiral threads to be seen, as described in Echinorhynchus proteus 
(Zeitschr. f. wiss. Zool., Bd. xiii. p. 418). 
It cannot of course at present be stated whence B. borealis 
obtains the larvee of FE. ruber. As the species is decidedly different 
from L. brevicollis, described by Malm from B. sibbald?, it is not 
probable that both species get their parasites from the same crus- 
tacean. We know that Luphausia inermis (a Thysanopod) is the 
species from which B. sibbaldi probably exclusively obtains its food 
in the summer months, and it is therefore not improbable that Echino- 
rhynchus brevicollis passes through its first stages with this species. 
Whether Calanus finmarchicus is the first host of EZ. ruber can 
only be conjectured as a possibility. It seems, however, more 
probable that a somewhat larger crustacean, which perhaps consti- 
tutes the food of this Whale at other seasons of the year, is the true 
transporter of this parasite. 
Its diagnosis will be as follows :— 
E. ruBER, n. sp. Total length 25 millim.; proboscis with about 4 
rows of spines, rostellum with 10-12 rows. Neck shorter than the 
transverse diameter of the body, thread-like. Corpus short, emerging 
abruptly from the neck. Colour in adult brick-red. - 
XI. Time of Capture. 
It has been previously stated, that in 1882 B. borealis first 
became the object of general capture, especially at the newly founded 
establishment at Séréen, near Hammerfest, and it appears to “ close 
the land” about there every year, although in varying numbers. 
In previous years the first specimen, according to Capt. Bull, 
was captured in the beginning of June. The 24th of June was about 
the best period for catching them, while after the 8th July they 
gradually disappeared, when other species generally appeared (B. 
musculus and B, sibbaldi). 
This year (1885) B. borealis coasted the land along the whole 
of Finmark, and formed such a considerable portion of the 
“ Fishery,” that it surpassed the number of all other species com- 
bined. 
