1862.] PROF. GULLIVER ON THE RED CORPUSCLES, ETC. 91 
In Terinos taxiles, the lower disco-cellular nervure meets the me- 
dian nervure a little before the base of its second branch. 
In Terinos teuthras, the lower disco-cellular nervure meets the 
median nervure at the dase of its second branch. 
In Terinos tethys, the lower disco-cellular nervure meets the me- 
dian nervure @ little beyond the base of its second branch. 
3. On THE Rep CorpuscLes oF THE BLoop or VERTEBRATA, 
AND ON THE ZooxoGicaL Import oF THE NUCLEUS, WITH 
PLANS OF THEIR STRUCTURE, ForM, AND S1zE (on A UNtI- 
FORM SCALE), IN MANY OF THE DIFFERENT ORDERS. By 
GrorGe GuLutver, F.R.S., Proressor or COMPARATIVE 
ANATOMY AND PuysioLoGy TO THE RoyaAt COLLEGE OF 
SURGEONS. 
The object of this communication is to give a summary of the 
value and import of the red corpuscles of the blood as regards sy- 
stematic zoology, deduced from my observations published, piecemeal, 
during the last twenty-three years, in the ‘ Proceedings’ of this 
Society and elsewhere. Such notices will be given of the labours of 
others in this interesting field, up to the year 1845, as the present 
confused state of physiological history may seem most to require. 
The drawings now exhibited to the Society are selected from a 
much larger number in my possession, and are all on the same scale, 
exhibiting plainly to the eye the relative form and size of the cor- 
puscles in 171 species of the different classes and orders of the Ver- 
tebrate subkingdom, and the difference of structure in the corpuscles 
of the two great divisions of this subkingdom—i. e., 1, Vertebrata 
apyrenemata, or Mammalia; 2, Vertebrata pyrenemata, or Ovi- 
parous Vertebrata. 
Structure of the Corpuscles of Apyrenematous Vertebrates. 
In Man and other Mammalia there are two sets of red corpuscles. 
The first or temporary set disappears at an early period of intra- 
uterine life, and is replaced by the second or permanent set. 
The corpuscle of the temporary set is composed of a vesicle in- 
cluding a nucleus, is larger than the corpuscle of the second set, and 
is, in short, a cell containing a nucleus. This cell is, both in struc- 
ture and size, the true analogue of the red corpuscle of oviparous 
Vertebrata. (See Phil. Mag. for Aug., 1842, p. 107; and my 
Note to Wagner’s Physiology, Lond., 1844, p. 242, fig. 148.) 
The corpuscles of the second set are those which replace the first 
set, and, subject to waste and supply, are the red corpuscles of the 
blood from birth, and during the greater part of the period of utero- 
gestation, until death; and to these corpuscles the following ob- 
servations will always be applied, unless otherwise expressed. 
This corpuscle is not homogeneous, but is composed of a colour- 
less membranous part, with a semifluid or viscid matter in which 
