SYSTEMATIC WORK. 
Ma m m. 39 
7. CETACEA. 
The respiration is described by Jolyet, supra, p. 11 ; Hepburn, p. 9, 
treats of the mammary glands ; Mtfnius, p. 15, examines and criticizes 
a Japanese work on Whales ; Pouchet, p. 17, investigates ancient 
records of stranded specimens ; while South well, p. 19, gives 
details of the whale-fishery of 1892. 
ft. Balmnidj:. 
Baltena ( Eubalcenct ) biscayensis : Guldberg, Zool. Jalirb. Syst. vii, p. 1, 
describes and figures an example stranded in 1889, with details of 
its anatomy. 
Bahcnoptera sibbaldi : a stranded specimen ; see Beauregard, supra , 
p. 4. 
Balcmopiera musculus : its rudimentary hind limb contrasted by 
Strutiiers ( supra , p. 20) with that of other genera. 
c. PhYSETERIDjE. 
Physeler tnacrocephalus : for record of specimen stranded on Sicilian 
coast, see Riggio, sujjra , p. 18. 
From an examination of a large series of specimens, Forbes (P. Zool. 
Soc. London, 1893, pp. 216-236) concludes that in the skull of 
Mesoplodon the mesorostral bone, instead of being derived from 
the cartilage of the same name, is in great part formed by a special 
development of the osseous tissues of the floor and sides of the 
vomer, and of the premaxillaries ; such ultra development being 
probably caused by the compression of those bones, as a result of the 
vigorous early growth in the premaxillae and maxillae that surround 
them. It is further shown that the form of the rostrum, when seen 
in transverse section, varies greatly with age and sex, so that the 
outlines of the bones constituting such a section canuot be regarded 
as sufficient to characterize a species. It is concluded that the 
number of existing species of the genus is six, viz, : M. bidens, M. 
europmus , M. hectori , M. layardi , M. densirostris , and M. grayi. 
Mesoplodon bidens : a female stranded on the Norfolk coast, near Cromer, 
on December 18th, 1892, is described by Southwell & Harmek, 
Ann. Nat. Hist. (6) xi, pp. 275-284, with a list of all previously 
recorded British examples. In the same volume, p. 439, Rothschild 
gives reasons for believing that while the male has the under-parts 
white, the female is uniformly black. 
f Dioplodon [ Mesoplodon ] tenuirostris and Placoziphius duboisi , recorded 
by Capellini, Rend. Ac. Lincei, ii, pp. 283-288, from the Tertiary 
of Italy. 
