of the Fishery Board for Scotland. 275 



covered with mud. This is the first time that Diastylopsis resima has 

 been observed in Scottish waters. Diastyloides biplicata, G. 0. Sars, 

 was also frequent in the same gatherings. 



Leptostylis villosa, G. O. Sars. (PI. XVIIL, fig. 41.) 



This species has been added to the British fauna during the past year. 

 The first specimens were obtained in the Firth of Clyde in 1896 in a 

 tow-net gathering from 40 fathoms collected by the "Garland'' between 

 Arran and the coast of Ayrshire. It has also been observed in a tow-net 

 gathering collected fifty miles south-east of Fair Island, in about 60 to 

 65 fathoms, on October 19, by the steam trawler " St. Andrew." 

 Leptostylis villosa may be distinguished from its confreres by the 

 peculiar form of the marginal serration of the carapace; figure 41, Plate 

 XVIIL, represents a small portion of the margin of the carapace, and 

 shows the peculiar form of the serration. 



PSEUDOCUMIDiE. 



Pseudocuma similis, G. 0. Sars. 



This species has also been lately added to the British fauna from the 

 Firth of Clyde. It was obtained in a gathering collected by the 

 "Garland" in moderately deep water near the mouth of the estuary in 

 December, 1899. Pseudocuma similis has also been obtained in gather- 

 ings collected ^ by the steam trawler "St. Andrew" off Fair Island in 

 about 80 to 85 fathoms on October 16th, and by the *'• Garland " off 

 Aberdeen in 42 to 45 fathoms on November 7th and 12th, 1900. 

 Although it is not very difficult to recognise this Pseudocuma after the 

 observer has become familiar with its peculiarities, it nevertheless so 

 closely resembles the more common Pseudocuma cercaria (v. Beneden), 

 with which it is frequently associated, that it may be readily passed over as 

 belonging to that species. Pseudocuma similis has also recently been 

 recorded from the Irish Sea,* which seems to indicate that the distribu- 

 tion of this species in British waters may be fairly extensive. 



Petalosarsia declivis, (G. O. Sars). 



Petalosarsia was obtained in at least three different gatherings 

 collected by the " Garland " off Aberdeen in October and November last 

 year ; it occurred in a gathering from 36 to 49 fathoms collected on 

 October 23rd, and in one from 60 fathoms collected on the 25th, and it 

 also occurred in a gathering collected on November 7th from 45 fathoms, 

 The same species was also observed in one of the gatherings collected 

 by the steam trawler " St. Andrew " off Fair Island on October 16th. 



NANNASTACIDiE. 



Cumella pygmma, G. 0. Sars. 



This small species occurred in the gathering collected by the " Gar- 

 land " in 45 fathoms off Aberdeen on November 7th. It was also collected 

 in Aberdeen Bay by Mr. H. C. Williamson on August the 9th. The 

 species is very small and easily missed. 



*. A. Scott, in Lancashire Sea -Fisheries Report for 1900 (March 1901.)., 



