ON THE ANATOMY OF THE NORTHERN BELUGA. 433 
Mamma.*—The mammary gland, as usual in cetacea, lies alongside of the 
vulva; it measures 3 inches in length. The nipple is of small size, and is 
concealed in a slight depression of the integument 14 inch from the margin of 
the genital fissure. 
In respect of this gland Beluga does not differ from other cetacea. In 
Risso’s Grampus Dr Muriet describes the erector clitoridis muscle as being 
functionally a compressor of the mammary gland; but in Beluga this muscle 
lies altogether on a deeper plane than the gland, and in close contact with the 
crus clitoridis, and cannot therefore act in the manner indicated. 
MALE GENERATIVE ORGANS. 
These we have not ourselves had an opportunity of examining. With the 
view, however, of rendering the anatomical description of Beluga as complete 
as possible, we venture to transcribe the following observations by Dr Barcuay { 
upon the male genitals :--- 
“The testicles we found within the abdomen, of an oblong shape, and lying 
close by the sides of the intestine, near its extremity. They were 4 inches in 
length, and the same in circumference. The penis was conical; at the apex 
13 inch in circumference, but 4 in circumference towards the base, near to 
which it exhibited a sigmoid flexure, owing to two very powerful muscles that 
seemed to have performed the office of retractors. Through its whole extent it 
was solt and flexible, without either a bone or a cartilage.” 
This description, incomplete as it is, seems to show that in respect of the 
male organs Beluga does not differ materially from Globiocephalus,, Lageno- 
rhynchus,|| and the other toothed whales. 
CONCLUDING REMARKS. 
In the present imperfect state of our knowlege of cetacean anatomy, it is 
impossible to arrive at any definite conclusion with regard to the relation in 
which Beluga stands to other genera. At the same time, a reference to the 
comparative observations contained in the foregoing pages serves to show that, 
so far as the soft parts are concerned, Beluga in many respects presents a close 
resemblance to Grampus and to Globiocephalus, whilst it differs from both in 
several minor particulars. From an examination of the skeleton, Professor 
* According to Frowsr, the male mammary glands of cetacea were first discovered in Beluga by 
Patias.—P. Z. 8. i. 865. 
+ X. p. 122. t VIII p. 384. § IV. p. 164. {| V. p. 149. 
VOb, XXIX, PART I. a Uh 
