1886.] MR. R. COLLETT ON BALZNOPTERA BOREALIS. 261 
obtained on the same day both large and small foetuses. So far as 
my knowledge goes, a foetus has never been met with under 2 feet 
in length. 
The four foetuses examined by me were taken out between the 
16th and 19th July, and were from 5 to 9 feet (1:5 to 2°8 m.) in 
length, as will be seen by the following measurements :— 
16 July. 18 July. 19 July. | 18 July. 
|No. 1, 9.\No. 2, 3.| No. 3, g.) No. 4, ¢. 
millim. millim. | millim. | millim. | 
FeO PUN ee fechaG co csnc ontoaiezes coe 1550 1830 2410 2830 
Snout to angle of mouth ............... 250 320 410 460 
Angle of mouth to flipper............... 220 250 350 360 
Length of the flipper...........-....:.++ 240 | 250 370 410 
Width of the flipper ........ ..........0. 50 54 ia = 
Snout to the dorsal fin .................. 1030 | 1180 1550 1810 
Dorsal fin to end of the tail ............ 520 | 650 860 1020 
Snout, to the navel)... 0<.s:)s<c++062.--002 760 940 1230 1340 
| Greatest height of the body ............ 240 300 330 390 
Height at the beginning of the dorsal 
| cl gg ese ce Ber Con Ones @ eRe Remene maree 5 170 230 | 310 320 
Height at the middle of the tail ...... | 140 160 220 25-0 
The least height of the tail ............ | 100 $20 ie) Sea a TO] 
| 
Length of each fluke ..........,.......--- ft cm20O ie hi: ~ 250 af i | 340 
The colour of these foetuses was homogeneous, a reddish-brown 
on the upper and under sides, without any appearance of white on 
the belly. It was only in the largest ones that there was any indi- 
cation of the baleen. Their covering of hair, on the contrary, as 
previously stated, was considerable. 
Twins.—On the 27th July, Capt. Bruun captured at the entrance 
to the Varangerfjord a female 43 feet long, which contained two young 
ones, each six feet seven inches long. So far as I know, twins have 
never been observed by others. 
XIIL. Food. 
In all the examples I examined in the middle of July the stomach 
and intestines were filled with a fine gritty mass, which consisted 
entirely of Calanus finmarchicus' (figs. F, G, p. 262). These were 
half digested, but among the hairs of the baleen-plates they 
occurred in great numbers and in a tolerable state of preservation. 
The feeces had the same intensely red colour as the contents of the 
intestines and stomach. Calanus finmarchicus is known to occur in 
two forms, one large, the other small. The form here met with was 
the latter. How far this Copepod formed the only nourishment of 
this species during the time they remained under the Finmark 
coast is doubtful. In East Finmark it probably formed their only 
' Monoculus finmarchicus, Gunnerius, 1765; Cyclops finmarchicus, Mill. (ex 
Gunn.) Zool. Dan. Prodr. p. 201 (1776). 
