28 DR. J. MURIE ON THE MANATEE. 
inches. 
At the narrowest portion its transverse diameteris. . . . . . . . 20 
Girthiatthemooti: Sch ser ac ee ne oe ia ee oe’ re OGD 
(Crile clontiginasGollys, = 50 5 o Yoo b op mee oo a oF dlORe 
Girth at about the outer distalthird . . 1... .. +... .. - 1075 
Tail or caudal extremity. 
Extreme length, or from the loin-wrinkle backwards, measured on the 
veritral SUrtACe t=. * . ce eens cal ee Ree cans” tele eC eeemEO CT 
Extreme length, measured on the dorsal surface . . . . . . . . 275 
Distance between first wrinkle and angle of terminal border. . . . . 18°5 
Breadth, following curvature of terminal border . ...... =. 1560 
Extreme breadth, following superior curvature ofskin . . .. . . 185 
Girth about four inches from the tip . . . +» . « . «-.-. ~~. 250 
Girthtaboutitenlinches}trom'the tips), <5 = sue S-neen a ee ae 
Girth at the root or hindermost lom-wrinkle. . . . . . . . . . 280 
Generative organs &c. 
Reeinmmidistant tromiendion tall) srs) as) sete eae en 0 et ee en Ooo 
Distance from middle of anus to opening of vagina. . . .. .. =. 52 
The umbilicus is distant from muzzle . . . . . we we eee OHS 
The umbilicus is distant from endoftail . . . .. ... .. . 583 
The umbilicus is distant from middle of vaginal opening . . . . . . 20 
Allowing for difference of age and other conditions, these measurements, if compared 
with those formerly given by myself, will be seen to present a general correspondence, 
saving that the present animal has relatively less girth, doubtless accounted for by 
wasting of body. While, on the whole, there appear to be equal increments of growth 
corresponding with age, it moreover comes out, when Prof. Wilder’s foetus (in paper 
cited) is taken into consideration, that the head decreases in proportion to the entire 
length of the animal. Thus from fetal to adult life in Wilder’s and my own three 
examples the decreasing ratio of the head may be taken respectively as 30, 18, 17, 15. 
The hiatus between 30 and 18 would no doubt be bridged were the new-born or quite 
young animal examined. The decrement of facial length Wilder regards as indicative 
of a retrograde metamorphosis. 
What admeasurements fail to show, or at least but imperfectly indicate, is the 
marked difference between the general contour of the head, body, and flippers of this 
specimen and the younger male Manatee formerly photographed by me. Especially is 
this the case in the view from above, to appreciate which compare the present fig. 2, 
Pl. VIL., with a corresponding dorsal view, Trans. Zool. Soc. vol. viii. pl. xviii. fig. 3. 
Moreover the tegument itself varied quite distinctly, though this might in part be due 
to age, lean condition, and other influences. 
As a whole the skin did not exhibit so very markedly the deep cracks, wrinkles, 
and minor furrows so characteristic of the younger male. Besides, whether from age, 
