16 Proceedings of the Royal Physical Society. 
V.— Scotia Collections—Siphonophora of the Scottish National 
Antarctic Expedition. By J. H. Koeppern, Zoological Depart- 
ment, University of Edinburgh. 
(Received 13th December 1912. Read 16th December 1912.) 
THE Siphonophora collected by the Scottish National Antarctic Expedition 
(1902-1904) were kindly entrusted to me for examination by Dr W. S. 
Bruce, to whom my thanks are also due for the loan of literature and 
charts, and for the permission to reproduce three photographs previously 
published in the Zoological Log of the expedition. I am grateful to Dr 
J. H. Ashworth for various suggestions during the course of my work. 
The notorious difficulty of satisfactorily preserving such fragile forms of 
animal life has made the specific determination of a few of the specimens 
somewhat difficult. Some of the Physalie and Velellz, however, are 
excellently preserved in formalin. 
The structures described by Professor J. Arthur Thomson! as separated 
gonostyles of “Scotia” Siphonophora from the South Orkneys, probably 
belong to the species Myriotheca austrogeorgia2 whereas the detached 
tentacles referred to the Siphonophora by Dr J. Rennie® must be considered 
as parts of Desmonema.* 
Family PORPITIDA, Brandt, 1835. 
xenus Porpita, Lamarck, 1816, 
Porpita umbella, O. F. Miiller, 1776. — 
Eleven specimens referable to this species were collected from shore 
pools at Scotia Bay, South Orkneys, 2nd February 1904, the temperature 
being a little below freezing-point. Their diameters in the preserved state 
range from 7 to 12 mm. This is the most southern station from 
which the species has been recorded. 
The macerated pneumatophore of a Porpitid, with a diameter of 3 mm., 
was caught in the tow-net at the surface, at Station 30, 11° 15’ N., 25° 
20’ W., temp. 79° F. Small isolated tentacles closely resembling those of 
the Scotia Bay Porpitee were preserved along with some Velelle from 
Station 53, St Paul Rocks. 
' Proc, Roy. Phys, Soc, Edinburgh, vol. xvi. (1904), pp. 19-22, 1 pl. 
* J. Ritchie, “Supplementary Report on the Hydroids of the Scottish National Antarctic 
Expedition,” Trans, Roy. Soc. Hd, (1909), vol. xlvii., pt. i., No. 4, p. 69. 
% Proc. Roy. Phys. Soc, Hd., vol. xvi. (1904), pp. 25-27, 1 pl. 
' EK. T. Browne, “ Meduse,” National Antarctic Expedition (1910), v., p. 51. 
