350 TRANSACTIONS, NATURAL HISTORY SOCIETY OF GLASGOW. 
CLADOCERA. 
Alona guttata, G. O. Sars. Alona affinis, Leydig. 
AMPHIPODA, 
Orchestia mediterranea, Costa.  Apherusa jurinii (M. Edw.) 
Gammarus duebeni, Lilljeborg. 
ISOPODA. 
Jera marina (O. Fabricius). Eurydice pulchra, Leach. 
Spheroma rugicauda, Leach. Idothea baltica (Pallas). 
Lngia oceanica (Linné). Oniscus asellus, Linné. 
Porcellio scaber, Latreille. Philoscia muscorum (Scopoli). 
NOTES ON SOME OF THE SPECIES. 
As a detailed description of all the species mentioned in the 
list is beyond the scope of this Paper, I confine my remarks to a 
few of the rarer forms only, and chiefly to those among the 
Copepoda, as follows :— 
CoPEPODA. 
(1) Hurytemora velox (Lilljeborg).—This species, so far as its 
British distribution is concerned, is most frequently found in 
“brackish water, and more rarely in fresh water. Though it 
has not previously been noticed in the Hunterston district, 
it has on several occasions been recorded from places within 
the Clyde area, as at Rutherglen, where it was obtained by 
Mr. James Steel, and in Possil Marsh—these two are fresh- 
water localities; at Langbank, where I observed it two years 
ago; and at Cumbrae, whence it is recorded by Prof. G. S. 
Brady. #. velox was quite common in some of the pools at 
Hunterston, and, being a moderately large species, the two 
younger members of our expedition could, with their keener 
eyesight and without artificial assistance, see the creatures quite 
distinctly swimming in the water. 
Eetinosoma curticorne, Boeck.—This species is probably more 
common in the Clyde district than it at present appears to be; it 
is usually of a brownish colour, and as this harmonises with the 
sort of material in which it commonly occurs, it is readily passed 
over unobserved. In the examination of gatherings collected by 

