128 Proceedings of the Royal Physical Society. 



10. Eudorella triincatula, Spence Bate. 



1856. Eudora truncatula, Bate, Ann. and Mag. Nat. Hist. (2), 



vol. xvii. p. 457, pi. xiv. fig. 3. 

 1900. Eudorella truncatula, Gr. 0. Sars, op. cit., p. xxxvii, pi. xxix. 



Habitat. — Firth of Forth, sparingly distributed ; my latest 

 record is for Station III., where it was collected on 23rd 

 May 1901. Immature specimens are not uncommon, but 

 adults of either sex are rare. 



Genus (8) Eudorellopsis, G. 0. Sars, 1882. 



11. Eudorellopsis deformis (Kroyer). 



1846. Leucon deformis, Kroyer, op. cit, p. 194, pi. ii. fig. 4. 



Habitat. — Taken off St Monans and in Aberlady Bay, 

 1890 ; not common. This species, though somewhat rare, 

 is widely distributed. 



Family Diastylid^. 

 Genus (9) Diastylis, Say, 1818. 



12. Diastylis Rathhei (Kroyer). 



1841. Cuma Rathhei, Kroyer, Naturh. Tidssk., vol. iii. p. 513, 

 pis. V. and vi. figs. 17-30. 



Habitat. — Not very rare in the Firth of Forth. A con- 

 siderable number of specimens were captured by the dredge 

 off the west side of Inchkeith in 1888 : both females and 

 adult males were present in this gathering. Prof. G. 0. Sars 

 mentions {Crustacea of Norway, p. 108) that the drawings 

 of the male on plate Ixxii. of his fine work on this group were 

 prepared from a Forth specimen. Adam White, in his 

 Popular History of British Crustacea, considered the Alauna 

 rostrata of Goodsir to be synonymous with D. Rathkei 

 (Kroyer), — an opinion which is also shared by Canon Norman. 



13. Diastylis rugosa, G. 0. Sars. 



1864. Diastylis rugosa, G. 0. Sars, Clir. Vid.-Selsk. Forhandl. (1864), 

 p. 41. 



Habitat. — Generally distributed, but not common. It has 

 been taken in Largo Bay, off St Monans, off North Berwick, 

 and in the deep water west of May Island. 



