376 TRANSACTIONS, NATURAL HISTORY SOCIKTV OF GLASGOW. 



probably done by bringing tbe head and tail 

 together." * This I have not seen them do, even 

 although I assisted them to get their "head and 

 tail together." They certainly try to escaj)e, but 

 it is a slow process. 



PoRCELLiDiUM FiMBRiATUM, Claus. — This little cope- 

 pode, which seems to be generally distributed, is 

 common here — not only among material dredged at 

 a depth of from five to ten fathoms, but also upon 

 fronds of Laminaria at low-water mark. Specimens 

 of this si3ecies were exhibited to the Society by Mr. 

 Robertson in 1864. A peculiar habit of this little 

 creature, which I have not seen noticed elsewhere, is 

 that if disturbed ^vhen running about on a frond of 

 Laminaria it will adhere so very firmly, limxDet- 

 fashion, that it can only be detached with some 

 difficulty. A very good plan is to alloAV it to run, 

 guiding its movements towards the edge of the frond, 

 when a sudden jerk removes it ere it has had time 

 to turn the corner. 



Peltidium depressum, Baird (P. pui-pureum, White). 

 — This is a beautiful species of copepode, of Avhich 

 there is a very good figure in White's Popular 

 History of British Crustacea. In the second volume 

 of Dr. G. S. Brady's Monograph of B)-itlsh Copepoda 

 (published in 1880) there is no record of its occurrence 

 in the West of Scotland ; but Dr. Bra(iy states that 

 it "will probably be fovmd wherever Lamiiiaria 

 saccharina grows." He also says : " It does not 

 often occur amongst dredged material, but I noticed 

 it on one occasion amongst coarse sand from a 

 depth of four fathoms at Sunderland." It is only 

 amongst dredged material that I have hitherto 

 found it, and have sometimes obtained a good 

 number of specimens in one dredging. Its colour is 

 yellowish, with the second and third segments of a 

 fine deep purple. 



* Bate and Westwood, I.e., ii. 128. 



