37 
Of the Edentata, as far as can be inferred from the few yet exa- 
mined, the mean size of the blood-corpuscles is larger than in mam- 
mals generally. And in the genus Bradypus, as fully explained in 
the Proceedings of the Zoological Society, June 11, 1844, I found 
those corpuscles larger than any yet observed in Mammalia, with the 
single exception of those of the Elephant. This large size of the 
blood-corpuscles of the Sloth is confirmed by the measurement now 
given of them, from a younger animal than that which afforded me 
the blood for the former observations. 
Judging from the facts at present ascertained, the marsupial ani- 
mals appear to agree in the size and form of the blood-corpuscles 
with the corresponding placental Mammalia, as mentioned in my 
notice in the Dublin Medical Press, November 1839, and in the Pro- 
ceedings of the Zoological Society, June 8, 1841. But in the Mar- 
supials further observations are required. The measurement now 
given of the blood-corpuscles of the Crab-eating Opossum accords 
with the view just stated. 
The following measurements of the blood-corpuscles of Birds tend 
to confirm the result which I have before published, that in this entire 
class the law for the size of the corpuscles is the same as in a single 
family of Mammalia; and that the short diameter of the oval blood- 
corpuscles of Birds has a general correspondence with the diameter 
of the circular blood-corpuscles of mammals. 
Through the kindness of Dr. Andrew Smith, I am enabled to add 
measurements of the blood-corpuscles of such reptiles as were alive 
some time since in his very interesting and valuable collection. 
Laland’s Megalotis (Otocyon Lalandii, [Desm.]) .... 1-3600 
Meminna Deer (Moschus Meminna, Erxl.)..........1-12325 
Red Brocket Deer (Cervus nemorivagus, Cuv.) ...... 1-7060 
A Brocket Deer (Cervus—a new species) .......... 1-7125 
Prarochs' (Hes Upusyssodd.) oc- oe ce cs ee ee eee 1-4074 
A young Sloth (Bradypus didactylus, Linn.) . .. 1-2778 
Anteater (Echidna histriz, Cuv.) .............. 1-3300 
Crab-eating Opossum (Didelphis cancrivora, Temm. Rs 1-3436 
Red-legged Falcon (falco rufipes, Bechst.).... pe nities 
Long-eared Owl (Otus vulgaris, Flem.)...... +8. ae 
Little Owl (Strix passerina, Temm.) ........ {sp ; ee 
Red-backed Shrike (Lanius collurio, Linn.) 1s. caane 
Cassowary (Casuarius emu, Lath.) .......... Aa) ; pe 
Great Bustard (Otis tarda, Linn.) .......... 18D: Psene 
Houbara Bustard (Otis houbara, Gmel.) 18D. iene 
Three-keeled Emys (Emys trijuga, Schw.) .. 18D. Eos 
