130 Proceedings of the Royal Physical Society. 



the common Pseudocuma cercaria so closely that it is easily 

 overlooked. The specimens I have were dredged at Station V., 

 on 24th April 1901. 



Genus (11) Petalosarsia, Stebbing, 1893. 



19. Petalosarsia declivis (G. 0. Sars). 



1864. Petalopus declivis, G. 0. Sars, Chr. Vid. Selsk. Forhandl. 

 (1864), p. 72. 



Habitat. — Dredged in Largo Bay in March 1891 ; in the 

 neighbourhood of May Island on 14th April 1893, and very 

 sparingly in other parts of the estuary. 



Family ISTannastacid^e. 

 Genus (12) Cumella, G. 0. Sars, 1864. 



20. Cumella pygmma, G. 0. Sars. 



1864. Cumella pygmcea, G. 0. Sars, Chr. Vid. Selsk. Forhandl. 



(1864), p. 74. 

 1869. ,, agilis, Norman, Brit. Assoc. Rept. (1868), p. 272. 



Habitat. — Taken at Station VI. (off St Monans), in May 

 and again in July 1901 ; rare. This is a minute species, 

 and easily missed ; it may therefore be more frequent in the 

 Forth estuary than at present it appears to be. 



Family Campylaspid^. 

 Genus (13) Campylaspis, G. 0. Sars, 1864. 



21. Campylaspis rubicunda (Lilljeborg). 



1855. (Juma rubicunda, Lillj., Ofvers af Vet. -Akad. Forhandl. , p. 121. 



Habitat. — Taken in the neighbourhood of the Bass Rock 

 in 1889, and at Station V. on 30th August 1894. It has 

 also been taken off the east side of May Island, but always 

 very sparingly. This appears to be a deep-water species, 

 and is usually found on a muddy bottom. 



Suborder Is apod a. 



The work I have followed in the arrangement and nomen- 

 clature of the Isopoda is Prof. G. 0. Sars' Crustacea, of Norway, 

 vol. ii. (1896-1899). 



