1870.] MR.J,. B. PERRIN ON BALZNOPTERA ROSTRATA. 805 
The following papers were read :— 
1. Notes on the Anatomy of Balenoptera rostrata. By J. B. 
Perrin. (Communicated by Prof. Frower, F.R.S., 
iV 2°A:S:) 
A young female specimen of this species, captured in April 1870, 
at Weymouth, was purchased by Mr. Gerrard of Camden Town, 
and removed to the dissecting-room of the Zoological Society, where, 
by permission of the Council and through Professor Flower’s kind- 
ness, I had the opportunity of dissecting it. With his valuable 
assistance have I been enabled to make the observations embodied in 
the following communication. 
The anatomy of this species has been so fully described in the 
Monograph of Carte and Macalister * that it will be only necessary to 
mention certain peculiarities which this specimen presented. 
The following are the principal external measurements :— 
Measurements. ee 
Total length of animal from point of snout to extremity of 
tail, measured along the dorsal curvature ............ 13.82 
Ditto; in straight-line 2. ~. . \ye.,6o%:-- eaten alates nie 13 5 
From point of snout to base of flipper ................ 4 1 
From point of snout to base of dorsal fin .............. 9 14 
From anterior part of dorsal fin to the extremity of the tail 4 7 
From point of snout to anterior extremity of blow-hole.... 1 10 
Ponti, civblewaholes) ig....isow ches wae was ans ietacts f ADE D 
Length of median sulcus between blow-holes.......... «stale dl 
From point of snout to anterior angle of eye ............ 2; aft 
Length of long axis of ocular aperture ................ 0 2 
Length of long axis of palpebral fissure................ 0 5 
From posterior extremity of median basal groove to the eye 1 13 
Length of upper maxilla from point of snout to posterior 
extremity of intermaxillary groove.-................ 3 323 
Lower jaw measured from apex to the same point........ 3 63 
Length of flipper along ventral border, from commencement 
Ba iinmeemer hy. 2) Joe S35 0 bis wos hae adi Chow 2 23 
Length along dorsal border from axillary fold .......... 1 9 
Girth of flipper at base ....... bdr ncyaal« ctrmsnebaad= detec 11g 
Girth of flipper at the distal point of termination of the 
white zone ..... ey. Ete TEL a x BE ieraibiahe 1, 02 
Anus is situated at a point corresponding to the posterior 
part of the ridge at the base of the dorsal fin. 
The mammilla is situated above the anus .............. 0 32 
From anus to the bottom of the fissure in the tail........ 3 64 
From annstojtheendyof, fhe, tails 6:59.05 :chsr0 ia. 5,cy Jes years 3 8 
Brom, anpa:to. they umabilleus by re sige cet > «en aiars eens tehnn 2 4 
Petree width oftallen cf 3 sath Geant ytd aprirenee si iawal 2o: oe 
* Philosophical Transactions, 1868, p. 201. 
