24 Rev. T. R. R. Stebbing on Crustacea. 



men, for the late Professor Kinalian is said to have found a 

 dozen species of Oniscidaj in a garden not sixty yards square. 



Some English Marine Isopods. 



Tlie paper on the Idoteid^ of the coasts of France, recently 

 published by Mons. Adrien Dollfus (' Feuille des Jeunes 

 Naturalistes,' Nov. 1, 1894), gives a readjustment of the 

 nomenclature in many respects applicable to the species of 

 that family which are found on the English coast. The 

 species assigned to Idotea by Bate and Westwood are distri- 

 buted by Dollfus among three genera — Stenosoma, Leach, in 

 which the pleon has all the segments coalesced ; Idotea, 

 Fabricius, in which the first two segments of the pleon are 

 dorsally distinct and the third is laterally indicated ; Zenobia, 

 Risso, in which the first three segments of the pleon are 

 dorsally distinct and the fourth is laterally indicated. 



Of these three generic names Zenolia is undoubtedly pre- 

 occupied, and I therefore propose a change of it into Zeno- 

 iiana ; the species called Idotea parallela by Bate and 

 Westwood will then become Zenohiana prismatica (Risso). 

 Mr. E. J. Miers, in his ' Revision of the Idoteidge,' has 

 regarded Idotea acuminata (Leach) as a head-species, of 

 which Risso's apijendiculata, Rathke's capito, and some others 

 are synonyms or varieties. But, as Dollfus points out, there 

 are considerable differences separating several of these forms, 

 so that Idotea acuminata rightfully resumes the name Steno- 

 soma acuminatum, long ago given it by Leach, while Idotea 

 appendiculata of Bate and Westwood should rather be called 

 btenosoma lancifer, a manuscript name given it by Leach 

 and published by Miers. The Stenosoma appendiculatum 

 (Risso) and Stenosoma capita (Rathke) are not at present 

 known on the English coast. 



Eurydice spinigera, Hansen, may be added to the British 

 fauna, as I have taken it in the harbour of Ilfracombe. In 

 general appearance it is very like the common Eurydice 

 pulchra, but attains a larger size and is deeper in colouring, 

 the greater depth of hue being noticeable even in specimens 

 which have been long in spirit. Of distinguishing characters 

 easy to observe may be mentioned the shape of the side- 

 plates, which all have the hind angle acutely produced, and 

 the armature of the last segment of the pleon, which has a 

 distal emargination and a couple of spines at each angle, the 

 inner spine being much larger than the outer. 



