ANNALS OF SCOTTISH NATURAL HISTORY 220 



torily make out a fourth joint ; in one or two instances where there 

 was the appearance of a fourth joint examination with a "higher" 

 objective showed that the appearance was produced by the ap- 

 proximation of the bases of the subterminal setae ; for this reason I 

 was inclined at first to consider the species as a member of the 

 genus Typhlotanais, the females of which have the superior antennas 

 3-articulate, but as the general structure of the antennae in the male 

 and female, together with the form of the chelae, do not fit in well 

 with either genus, it is perhaps better to leave this Isopod where it 

 is for the present. In the female the first joint of the superior 

 antennae is long, but the other joints are short, and the second 

 appears to be hinged to the first joint, for in some of my specimens 

 the short end-joints bend over at nearly right angles to the first, 

 as if the antennae were being used as grasping organs. 



Leptognathia longiremis (LWjeborg). 



This species has been obtained in the Firth of Forth, in the 

 Moray Firth, and also in one or two places in the Clyde district. 

 It was first observed in a gathering of micro-crustacea collected off 

 North Berwick in December 1892, and in another gathering from 

 the same locality collected in January 1894. It was obtained in a 

 similar gathering from Guillam Bank, Moray Firth, collected in 

 1 89 5, and in another collected in June last, by Mr. F. G. Pearcey, 

 at Smith Bank. Moreover, the same species was taken at Tarbert 

 Bank, Loch Fyne, in 1896, and more recently near the head of the 

 same loch. . In this species, as well as in the two that follow, the 

 upper antennae in the female are "distinctly 4-articulate," and show 

 in this respect and in general structure a marked difference from 

 L. Lilljeborgi. 



Leptognathia breviremis (Lilljcborg). 



This species, which is smaller than the last, was obtained in the 

 same gatherings with it from the Firth of Forth and the Moray 

 Firth. A few specimens — two of them with ova — were also observed 

 in a gathering collected at Tarbert Bank, Loch Fyne, in 1896. 

 The length of the Forth specimens measured about one and a 

 quarter millimeter. 



Leptognathia brevimana (Lilljeborg). 



In this species the outer ramus of the uropods appears as if it 

 were merely a spine-like prolongation of the basal joint, and not a 

 distinct branch. This structural peculiarity forms one of the char- 

 acters of the species. Leptognathia brevimana is comparatively a 

 large species: a few of the specimens from the Firth of Forth 

 measured about 2-7 millimeters, exclusive of antennas or uropods. 



