58 Zoological Society. 



In a female of the same kind some of the blood-particles were as 

 large as 1-666 by 1-888; nucleus about 1-2666 and globular. 



Foetus oiSqualus acanthias; corpuscles about 1-1000 by 1-1600: 

 fcetus about seven inches long. 



Foetus of Squalus squatina, about six inches long ; corpuscles about 

 1-1000 by 1-1333. 



Small fish ; I have not vet made out the species ; corpuscles about 

 1-2000 by 1-2666. 



Another small fish, the kind of which is at present unknown to me; 

 corpuscles about 1-2666; the majority of them circular. 



These are the results of the few observations I made in Constan- 

 tinople. Not having books to refer to, I could not at the time deter- 

 mine several of the fishes, nor have I yet had leisure to compare my 

 notes with authorities on the subject, to make out the species. The 

 size of the particles of all the cartilaginous fishes is very much larger 

 than of the osseous ; the particles were few in number, transparent, 

 soft, readily changing their shape from slight pressure ; nuclei distinct. 



I have given the dimensions just as I noted them down. All the 

 fishes were fresh. J. D. 



Constantinople, Jan. 8, 1842. 



I have had a Humming Bird killed and instantly brought to me ; 

 its blood- corpuscles were beautifully definite, regular and uniform. 

 The disc very thin, perfectly flat, the nucleus slightly raised, and the 

 two corresponding in outline. The corpuscle l-2666th by l-4000th 

 of an inch ; the long diameter of the nucleus very nearly 1 -4000th. 

 The blood was small in quantity, as I apprehend is the blood of birds 

 generally, but not deficient in red corpuscles. I have found its tem- 

 perature to be about 105°. Whilst its solid food is insects, I believe 

 its drink is the sweet juice of flowers. I have not a book to refer to 

 for the species. Tail-feathers black ; head green ; rump green ; wings 

 brownish, almost black. J. D. 



Barbadoes, Jan. 7, 1846. 



The next paper was entitled " Descriptions of thirty new species 

 of Helicea, belonging to the collection of H. Cuming, Esq.," by Dr. 

 L. Pfeiffer :— 



1. Helix Swainsoni, Pfr. Hel. testa umbilicatd, utrinque depres- 

 sissimd, tenui, pellucidd, suharcuatim ruguloso-striatd, virescenti- 

 fulvd, lineis 2 rufis ornatd ; anfractibus 5 depressis, medio con- 

 vexiusculis, carinatis ; carina rvfcscente, acutd, brcviter promi- 

 nente, subrugulosd ; umbilico mediocri, prof undo ; apcrturd per- 

 obliqud, depresse securiformi ; peristomate simplice, recto, margine 

 columellari subincrassato. 



Diam. 16, alt. 5 mill. 



From Tahiti ; under stones (B. W. Tucker, Esq.). 



2. Helix stenostoma, Pfr. Hel. testd imperforate!, globuloso- 

 depressd, solidd, sublcEvigatd, nitidd, albd, fascid unicd fused ad 

 peripheriam et seriebus 2 macularum aurantiarum ornatd, punc- 

 tisque griscis obsolete aspersd ; anfractibus 4^ vix convexiusculis , 

 ultimo ventroso, antice abrupfe deficxo ; aperturd subhorizontali, 



