(N BELMULLET WHALING STATION. tél 
reference to them in literature. It is necessary that further specimens 
should be carefully preserved and examined. 
XVI. Farusss. 
An effort was made to obtain a foetus small enough for embryological 
work, but with no success. The genital organs of the adult are so large, 
compared with the size of the foetus required, that even if one of the 
latter be present there is a great chance that it will be lost among the 
entrails of the mother. Also it will be seen from the remarks above on 
breeding that there would be a much greater chance of obtaining a very 
young foetus in the earlier part of the season. 
Nine foetuses were examined altogether. Of these, eight were 
Balenoptera musculus (L.), and one Balenoptera sibbaldii (Gray). All 
the foetuses lay with the head towards the vagina of the mother. 
1. Balenoptera musculus (L.). 
A. Measurements.—A complete set of measurements, similar to 
those taken on the adults, was obtained for six of .the. foetuses. 
Table XI. is constructed in the same way as Tables I. and III.’ From 
this we see that the total length of the foetuses varied very much during 
the earlier part of the season, but tended to get larger towards the latter 
part. The table also shows that, out of seven individuals, five were 
females and two males. This indicates that, although fewer females may 
be caught, they are at least as numerous as the males. Table XII. 
shows the set of measurements made on six individuals. _ In this table 
the distances between the tips of the tail-flukes is included, as this 
measurement could be made on the feetuses. In Table XTII. we have 
the measurements reduced to percentages of the total length in each 
case, and the individuals are arranged in order of size. Table XIV. 
shows the average percentages of each of the twelve distances taken. 
If we compare these figures with those in the first column of Table VIT., 
we see that, while many agree very well, there are one or two excep- 
tions. The figures for the distance between the tip of the snout and the 
centre of the blowhole show that the latter is nearer the tip in a fcetus 
of between 5 and 9 feet than it is in the adult. The other noticeable 
point is that both the pectoral and dorsal fins are larger relatively in 
these foetuses than in the average adult. 
Taste XJ.—Balenoptera musculus (L.). Foetuses. 
Capture No. Date yen ue oF Sex of Foetus | 
port Ft. in Ft. in. } 
14 July 12 7 9 ‘2.8 11 3 
| 16 July 16 74 9 | 4 il rie? 
| 18 July 20 65 7 Rtctes os 2 
25 July 24 66° «8 6 0 2 
33 | Aug. 7 75. 0 557.6 ws as? 
3 | Aug. 11 66 0O 9 O 2 
49 Sept. 10 68 9 a0 io) 
| 51 Sept. 18 67 8 9 3 Or 
| 
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