322 MR. W. H. FLOWER ON THE OSTEOLOGY OF THE SPERM-WHALE. 
inches. 
Width of-rostrum/iat middle, scieHycadhdi ot sideRiner eee! AT 
Right maxillatyind YZ /org) clidu cam deh ieee teen els 
Left; maxillatyias ieoenneis teh fae balee A andl ete nina 
Right; preniallatyreck yibee. tomate dereeh Gow 9 
Left premaxillary ia: 
Space between premaxillaries . . . tte ra.catinr ds 2 
Width of rostrum at three-quarters distance Barn = sinlehtn dae (nel: 
Right maxillary Frere mea Rib gnecEllt aoe ee 2 
eftimaxall ary fae: et Rie iG aelincrenfie Sloeicr dh ees 2 
Right premaxillary . rete ntahic italy fete eghnouts § 
Left, premaxillany yinede stor idondacet canta frase ee vhan is 83 
Space between premaxillaries = ais a 
Premaxillaries extending beyond maxillaries. . . . . . . . . 22 
5 55 i vomer .. Siaanye Selb pg beh 
Antero-posterior length of orbital process of frontal bide) aay vial 
Length of jugal . . . . oe sig mornenkotan 2, 
Height of occipital crest abaxs thes jase of the great supra 
basin behind ethmoid . . . ; Ati. pel Ae 
Height of occipital crest above upper cede of. carne magnum . . 30 
Width of occipital condyles-se<;f?.)o a:ioi in ouiude cd asnuiilth aleieoy 
Height of right condyle (vertical) . . . . RS ay eae 
Width of foramen magnum at upper end, ae Eaidiles Sato lanes § 
The crania of the different skeletons presented no very marked distinguishing features, 
beyond such as might depend upon age or individual peculiarity. Of the adult, or 
nearly adult specimens, those from Caithness and Tasmania are most alike, the former, 
however, being rather larger and, especially, higher in the occipital crest. The York- 
shire specimen differs from both in the greater development of the rostrum, which is 
both broader and longer than in the others: and on this chiefly depends the immense 
size attained by this gigantic skull; for the portion of the cranium behind the antorbital 
notches is of exactly the same length as in the Caithness, and but one inch longer than 
in the Tasmanian Cachaiot. 
In the following Table the individuals are arranged according to their presumed 
ages, judging by the entire length of the skull. By comparing the figures showing the 
proportions, it will be seen that, taking the length of the skull without the rostrum as 
the basis of comparison, there is a relative increase in all the other dimensions during 
growth, but that both in height and breadth, especially the former, this increase is com- 
paratively slight and irregular, compared with the steady lengthening of the rostrum 
which occurs as age advances. 
