THE PURPLE MOUNTAIN SAXIFRAGE IN ISLAY. 71 



Crangon Allmanni, Kinahan.-This species closely resembles 

 C. vulgaris, but may be readily distinguished from that species 

 by the presence of two parallel keels with a deep groove between, 

 situated on the sixth segment of the pleon. It is, however, only 

 found in the deeper waters of our Firth, its distribution bemg 

 somewhat similar to that of Pontophilus spinosus, but it is usually 

 taken in the trawl in greater numbers than that species.* 



Note on the Occuprence of Saxifrag-a oppositifolia, L., 

 the Purple Mountain Saxifrage, on the Sea-coast 

 of Islay. 



By Alex. Somerville, B.Sc, F.L.S. 



[Read 24th April, 1906.] 



At the May meeting of the Society two years ago, our member, 

 Dr. Gilmour, Port-Ellen, was able to exhibit fresh specimens of 

 the Three-fiugered Saxifrage, Saxifraga tridactylites, L., from 

 the Machrie Sand-dunes, Islay. The plant was uew to his own 

 vice-county, the South Inner Hebrides, and, but for the record of 

 a single specimen from Tiree by Mr. S. M. Macvicar, would also 

 have°been an addition to the known flora of the West of 

 Scotland. 



On the present occasion, Dr. Gilmour has been able to send for 

 exhibition fresh flowering specimens of another Saxifrage, new 

 to his island and vice^couuty, viz., Saxifraga oppositifolia, L., a 

 plant very different from the previous, and indeed from all the 

 other seventeen British species of the genus; prostrate and 

 creeping in habit, and possessing a relatively large flower of 

 brilliant purple. 



* Note. -Up till the present time I have been able, with the use of the 

 " Mermaid," to make observaticns on the distribution of the Malacostraca 

 at about 720 stations in the Firth of Clyde. 1 hope, shortly, to place the 

 complete record, not only of these observations, but also of those I bad 

 made for some years prior to the advent of the " iMermaid," in the hands 

 of the Recorder in the Natural History Department of Glasgow University, 

 where they will be available for the use of marine zoologists. 



