480 Proceedings of Royal Society of Edinburgh. [sess. 
On Pennella : a Crustacean parasitic on the Firmer Whale 
( Balxnoptera musculus). By Sir William Turner, K.C.B., 
LL.D. 
In this memoir the author described a Pennella found attached 
to the back of a Balaenoptera musculus , specimens of which were 
given to him in 1903 by Mr Chr. Castberg. The specimens were 
of the same species as the Pennella balaenopterae, described by Koren 
and Danielssen in 1857, and found infesting B. rostrata. The 
species is a giant Copepod, and the longest examples measured 
about 12 J inches. 
The description included a short historical introduction to the 
genus, an account of the external characters and internal anatomy 
of the species, its comparison with other species, and the attach- 
ment to one of the specimens of Conchoderma Virgata. The 
memoir, with illustrations, will appear in the Transactions of the 
Society. 
{Issued separately March 30 , 1905 .) 
