Miscellaneous... 238 
more decided difference from the continuous open groove at the floor 
of the orbit in the adult female Tr. niger than that groove presents 
in comparison with the shorter and shallower one in Trogl. Gorilla. 
I find too that. the second character of Trogl. Gorilla pointed out by 
Prof. Agassiz,_—‘‘ from the internal walls of the orbits which recede 
from each other in descending towards the floor, thus leaving a large 
pyramidal space for the lodgment of the os ethmoides,’’—is so much 
Jess marked in the female skull of Tr. Gorilla, as contrasted with that 
of Tr. niger, as to induce me to view it more in the light of a sexual 
than a specific modification. ) 
The seventh is a good character, and is repeated by each of the 
skulls of Zi. Gorilla examined by me. All the skulls of Tr. niger also 
show the backward projecting point, where the emargination exists 
in Tr. Gorilla. 
8. The minor relative projection of the incisive alveoli beyond the 
line of the rest of the face is as characteristic of the three skulls of 
Tr. Gorilla now in England as of the four in the United States, and 
results from the same comparative shortness of the premaxillary 
hones, between the nasal orifice and the edge of the incisive alveoli. 
But the ossa nasi, besides being more narrow and compressed supe- 
riorly, are more prominent at that part in Tr. Gorilla than in Tr. niger, 
and they are also more expanded and broader inferiorly, and I cannot 
but regard the most decisive mark of the specific distinction of the 
Troglodytes Gorilla to be the longer persistence of the maxillo-pre- 
‘maxillary sutures, and the evidence thereby given of the peculiar 
form, development and connexions of the upper portions of the pre- 
maxillary bones. It is remarkable indeed, since these sutures remain 
-$o distinct in the adult female skull (fig. 2) and the younger adult 
-male skull (fig. 1), here described, that no trace of them should have 
‘been detected in any of the four skulls taken by Dr. Savage. to 
America, in which Dr. Wyman describes the ossa nasi as being 
“ firmly co-ossified with each other and with the surrounding bones.’ 
The triangular expanded facial part of the upper end of each pre- 
maxillary intervening between the nasal and maxillary bones will 
always serve to distinguish the cranium of an immature Trog/. Gorilla 
from that of a Trogl. niger. 
MISCELLANEOUS. 
“Note on the Development and Organization of Infusoria :—Gyratory 
"~ Movements of the Vitellus : Pulsations of the Contractile Vesicle in 
‘the Egg. By M. F. Poucner*. 
I nave followed out the development of several animalcules : some 
emerge from the ovum with the form they are destined to present 
during the whole course of their existence (Kerona, Vorticella); others 
undergo, in the course of development, very apparent metamorphoses 
~_* Communicated by J.T. Arlidge, A.B., M.B. 
