à Sperm Whale and other Cetaceans: 147 
3 Of the heart, the ventricular portion was formed very 
_ much as in the tortoises, measuring 16} inches transversely, 
whilst, from above downwards, the right side measured but 
7, and the left 8 inches. In the place of an apex, there was 
a broad surface, and rather a depression on the median line, 
as if it were the first step towards a separation of the ventri- 
-  eles, as seen in the dugong. Vrolik (Ann. des Sc. 1838) 
. Speaks of the semilunar form of the heart in some of the 
= eetaceans, but this was the only instance in which it was 
found, in the four specimens here described. The right 
auricle was about. twice as large as the double fist; form not 
remarkable, neither was its thickness; appendix well marked, 
and its cavity traversed by a mesh of strong, muscular fibres. 
oramen ovale quite closed, and the fossa very little marked. 
No Eustachian valve, neither was there in either of the three 
other specimens, Coronary vein one inch in diameter, and 
Opened at the usual place; no valve found in any one of the 
Specimens, One superior cava, which soon divided; one 
inferior cava, measuring, transversely, 8 inches, when cut 
9pen in its passage behind the liver, and entering the heart 
as Soon as it had passed through the diaphragm. 
Right ventricle from about ! to ? of an inch thick; the 
inher surface being very irregular from strong, muscular bands. 
"cuspid valve 14! inches along its adherent edge. Pulmo- 
_ Dary artery 3! inches from upper edge of valves to bifurca- 
. on, 9 inches in circumference on inner surface, and about 
2 lines thick. 
Left auricle rather smaller than the right. Parietes gene- 
Pd thin, but having numerous very strong and prominent 
poc columns on the inner surface. Appendix well — 
Br ies Fossa ovalis less distinct than on the right side. 
an the left ventricle the muscular columns were so numerous, 
"56 and prominent, that it was difficult to measure the 
Pirietes, but the average thickness was not far from 1} inches, 
ae of the apex being 5 lines. Circumference of mitral 
me... adherent edge 11 inches; corde tendinie very nu- 
FETU U LT. mi À Ree 
