22i NOTES ON SOME SCOTTISH MARINE ISOPODS 



I have specimens that were collected in the Firth of Forth in 1891 

 and 1892 ; it has also occurred in material dredged at Guillam 

 Bank, Moray Firth, in 1895, and more recently in a gathering col- 

 lected by Mr. F. G. Pearcey at Smith Bank. 



Leptognathia rigida {Spence Bate). 



Professor G. O. Sars, in his work on the Isopods of Norway 

 (page 26), states that Paratanais rigidus, Spence Bate, ought to be 

 referred to Leptognathia. Dr. Robertson records this species for 

 the Clyde ; it was taken at the roots of Laminaria in seven to eight 

 fathoms, near the Tan Buoy, Cumbrae. And I have recorded it for 

 the Firth of Forth ; no specimens of the species are, however, in my 

 collection, and it is therefore probable that Leptognathia Lilljeborgi, 

 or some other species, has been mistaken by me for this one. 



Tanaopsis laticaudata, G. O. Sars. 



Professor Sars first described this as a Leptognathia, but after- 

 wards changed its name to Tanaopsis. Dr. Robertson recorded this 

 species (under the older name) in 1892, from Fairland Point, 

 Cumbrae ; and the Rev. Mr. Stebbing, in his paper on L. Liiljeborgi, 

 refers to its occurrence at Karnes Bay, also in the neighbourhood of 

 Cumbrae. Tanaopsis laticaudata appears to be widely distributed 

 around the coast of Scotland. I found it fairly common, and of 

 large size, in Loch Gair (Loch Fyne). Professor Sars gives 2.6 milli- 

 meters as the average size of the species, but some of the Loch Gair 

 specimens measure fully 3.5 millimeters. I have observed the species 

 in other parts of the Clyde district, and also off Arisaig as well as 

 in the Moray Firth and in the Firth of Forth : specimens from the 

 latter estuary have been in my collection since 1891. 



Pseudotanais forcipatus, Lilljeborg. 



This species was moderately common in some material dredged 

 at Guillam Bank in August 1895 : both males and females occurred 

 in this material. A few specimens were also observed in a small 

 gathering of micro-crustacea from Smith Bank collected by F. G. 

 Pearcey in June last. These appear to be the only Scottish records 

 of this species hitherto ; but, as has been already said, the Paratanais 

 forcipatus recorded from the Clyde and from Banff may include 

 both Paratanais Batei and the present species. 1 



1 After these Notes had gone to press I obtained a few specimens of Pseudo- 

 tanais forcipatus in a gathering of small Crustacea from Tarbert Bank, Loch 

 Fyne, collected 31st March 1897. 



