393 
uterine cavity ; others, as S. acanthias and S. carcarias , being ovi- 
porous, their ova included in a shell with a white, yet developed in 
the same cavity, the presence of a shell constituting the difference 
comparing them with the preceding ; others, as R. aquila, and S. 
canicula, being oviparous, their eggs experiencing no embryonic 
development in the oviducts, and hatched after exclusion in the sea. 
Respecting the anal appendages, the characteristic of the male 
cartilaginous fish, the opinion the author is most inclined to adopt is, 
that they are not claspers, but rather organs of intromission ; prefer- 
ring this latter — the old view of their use, as noticed by Aristotle 
- — to the former, which is the more recently entertained one, from 
considering their structure and certain facts which have come to his 
knowledge. 
Concerning the branchial filaments, which have commonly been 
held to be mainly subservient to the supplying with air the blood 
of the embryo, he thinks they may have another use also, that of 
aiding the growth of the parts to which they belong. Their early 
absorption, and being sometimes found in other regions of the em- 
bryo than the branchia, are brought forward as circumstances favour- 
able to this idea. 
The following Gentlemen were admitted Ordinary Fel- 
lows - 
William A. F. Browne, F.R.C.S.E. 
Rev. Thomas Brown. 
Robert Edmund Score sby- Jackson, M.D., F.R.C.S.E. 
James M‘Bain, M.D., R.N. 
Professor P. Guthrie Tait. 
The following Donations to the Library were received : — 
Transactions of Royal Scottish Society of Arts, Vol. V., Part 4. 
8vo. — From the Society. 
Proceedings of Royal Society of London, Vol. X., No. 41. — From 
the Society. 
Proceedings of the Horticultural Society of London, Vol. I. Nos. 
18, 19. 8 vo. — From the Society. 
Jahresbericht der Chemie, von H. Kopp u. H. Will. Giessen, 
1860. 8 vo. — From the Authors. 
Proceedings of the Academy of Natural Sciences of Philadelphia, 
pp. 81—284, 8vo. — From the Academy. 
