514 Zoological Society. 
Lat... vix 1.) Long, uperte.” 3. 1h sy 
Long. 8 lin. : inp iam. S lin. vel 61 millim. 
Anfr. 9-11. 
Turbo elegantissimus, Mont. Turt., &c., &c. 
Turritella elegantissima, Flem. Brit. An. 303. n°. 218. 
Eulima elegantissima, Risso, Hist. IV. 123. n°. 296. 
Melania Campanelle, Phil. Enum. 156. ¢. 9. f. 5? 
Hab. in mari Britannico, Mediterraneo; Maderensi, rariss. vv. 
Animal lacteum, omnino ut in P. bulinea, nisi quod tentacula obtu-. 
siora sunt. 
Dredged with the former. Found also in 1824 at Sheean Ferry, 
near Appin, in Argyleshire. 
Alize species videntur : 
4. Parthenia crenata (Turbo crenatus, Mont. inedit. Melania rufa, 
Phil. Enum. 156. ¢. 9. f. 7?); que a P. elegantissima interstitiis 
costarum spiraliter striatis potissimum differt. 
Hab. in mari Britannico rariss. vm. 
5. Parthenia pallida. Melania pallida, Phil. Enum. 157. t. 9. f. 8. 
An Turbo unicus, Mont. Turt. Dict. 209, &c. ? 
Hab. in mari Siculo (Britannico ?). 
6. Parthenia scalaris. Melania scalaris, Phil. Enum. 157. t. 9. f. 9. 
An Turbo simillimus, Laskey, Turt. Dict. 209? 
Hab. in mari Siculo (Britannico ?). 
The genus Turbonilla of Risso (Hist. IV. 224. ff. 70. and 72.) 
appears to contain some fossil species also of Parthenia, besides the 
recent one above referred to. Other species are indicated by Phi- 
lippi as figured by Brocchi. 
The following paper was next read. It is entitled ‘‘ Observations 
on the Blood Corpuscles of the Snowy Owl and Passenger Pigeon,”’ 
by George Gulliver, F.R.S., Assistant Surgeon to the Royal Regi- 
ment of Horse Guards. 
‘Although I have found generally less difference in the blood 
corpuscles of birds than in those of the Mammalia, yet in some of 
the former there are peculiarities in the size and shape of the red 
particles, which appear to me, after a careful examination of the 
blood of upwards of two hundred different species, deserving of 
especial attention. As examples of this kind, I select from my 
notes an account of the blood corpuscles of the Snowy Owl and 
Passenger Pigeon, and, by way of comparison, of one or two other 
allied species. 
‘‘In the following measurements, as noted in the first observation, 
the common-sized corpuscles are first indicated; then the small and 
large extremes, and lastly, the average size, deduced from the whole. 
They are all expressed in fractional parts of an English inch. 
