SCHULTE, SEI WHALE. 403 



The hump. The hump is triangular with rounded apex. Its longest side is attached, 

 the intermediate is rostral, the shortest caudal. It is not falciform. Its caudal end is nearly 

 opposite the vulva, distinctly in front of the anus. Guldberg states that the posterior 

 extremity is opposite the anus, but his measurements (vide ante) indicate that it is somewhat in 

 advance of the latter. 



The flukes. The flukes are strongly rolled on themselves ventrad. The ridges of the 

 pedicle are prolonged between them to the notch, which is deep and narrow. 



The vulva. The vulva presents a prominent conical clitoris which overhangs the vestibule. 

 This is bounded at the sides by low ridges, the labia majora. Caudad the vestibule rises gradu- 

 ally to the level of the perineum, here presenting three short furrows, a median sagittal, and two 

 lateral diverging with slight mesal convexity. On either side are the slits of the mammary 

 pockets each about 2 mm. in length. There was no asymmetry of the external genitalia. 



The anus. The anus is slightly elongated sagittally separated by a convexity from the 

 vulva. The region about it is but slightly elevated above the general relief of the adjacent 

 surface. 



MYOLOGY. 

 (Plates LXIII-LXVin.) 



The chief source for the myology of the Mystacoceti is the study by Carte and MacAlister ! 

 of Balcenoptera rostrata ( = acuto-rostrata) published in 1869. Since that time the musculature 

 of the suborder has not again been investigated as a whole, and the list of authors dealing with 

 it at all is surprisingly small in comparison with those that have directed their attention to the 

 toothed whales. No doubt the accessibility and the smaller size of many members of the latter 

 suborder is largely accountable for this. As it is, Perrin 2 has partially reexamined B. acuto- 

 rostrata, and has reported his findings briefly in the form of addenda et corrigenda to the work 

 of Carte and MacAlister. Beauregard 3 has described in much detail the masseter and temporal 

 muscle of B. Sibaldii ( musculus) and B. musculus ( physalus) and there are further the impor- 

 tant studies of Weber 4 upon the ocular muscles and of Dubois 5 upon those of the larynx. The 

 fine work of Struthers fi upon the intrinsic muscles of the flipper, and upon those of the pelvis 

 about exhausts the list. In these circumstances I have found it necessary to refer to the more 

 abundant literature of the Odontoceti on many occasions, but it is needless to say I have at- 

 tempted no general consideration of the comparative myology of the two suborders, nor do I 

 conceive that this could profitably be undertaken on the basis of our present scanty knowledge 

 of this subject in the Mystacoceti. 



1 Carte, A., and MacAlistor, A. On the anatomy of Balwnoplera rostrata. Phil. Trans. Roy. Soc. London, Vol. 158, p. 201 . 



2 Perrin, J. B. Notes on the anatomy of Balomoptera roslrata. P. Z. S., 1870, p. 805. 



3 Beauregard, H. Etude de 1'articulation temporo-maxillaire chez les Bala>nopte>es. Jour, de 1'Anat. et do la Phys., An. XVIII, 

 1882, p. 16. 



4 Weber, Max. Studien iiber Siiugethiere, Jena, 1886, p. 119. 



5 Dubois, E. Idem., p. 93. 



6 Struthers, J. On some points in the anatomy of a great finwhale (Balcenoptera musculus). Jour. Anat. and Phys., Vol. VI, 1871, 

 p. 107. Account of rudimentary finger muscles found in the Greenland right whale (Balama, mysticelus). Jour. Anat. and Phys.. Vol. 

 XII, 1878, p. 217. On the bones, articulations, and muscles of the rudimentary hind limb of the Greenland right whale (Balcena mysti- 

 celus). Jour. Anat. and Phys., Vol. XV, 1881, p. 141 and p. 301. Nature, Vol. IV, 1884, p. 342, contains in the proceedings of tho 

 Biol. Sect. A. A. A. a paragraph to the effect that rudimentary finger muscles are present in Megaptrra lonf/innnm . 



