A HISTORY OF LANCASHIRE 



synonym of C. prasinus (Fischer). In 1893 Mr. Thompson described a new 

 species under the name Cyclops marinus, of which he says : ' Two specimens 

 only, both females, were dredged in 20 fathoms, about 20 miles out from 

 Southport Pier.' 1 The name is preoccupied by C. marinus, Prestandrea, 1833, 

 a species now transferred to the genus Euchata. Apart from the accident 

 of preoccupation, the name chosen by Thompson is in conflict with the 

 opinion of Dr. Giesbrecht, whom I consulted on the subject, and who at a 

 recent date still refused to believe that any species of Cyclops hitherto 

 described could be relied on as exclusively marine. The settlement of this 

 point may be commended to the further attention of Lancashire naturalists. 



The Arpacticidae, in the wider sense of the term, have been variously 

 divided up into numerous sub-families or families, with which it would be 

 inexpedient here to concern ourselves. Distributed over these minor divisions 

 are the following Lancashire species : Arpacticus chelifer (O. F. Miiller) is 

 recorded by A. Scott from the mussel beds at Piel ; Canuella perplexa (T. and 

 A. Scott) from the mussel beds alike of Piel, of Duddon, and of Morecambe ; 

 Longipedia minor (T. and A. Scott) from the mussel beds of Morecambe. 3 

 With regard to Sunaristes paguri (Hesse) Mr. A. Scott writes : ' This rather 

 peculiar and interesting species was obtained by washing the shells of Buccinum 

 inhabited by the hermit crabs, Pagurus bernhardus, collected in the trawl-nets 

 of the steamer while working in the mouth of the Mersey estuary on the 

 23d of July, 1895. It seems to be a comparatively rare species, and so far 

 as is known this is only the third time it has been found in British waters. 

 From our present knowledge of its distribution it appears to be confined to 

 areas having large volumes of brackish water passing over the bottom, and 

 has not been found in pure sea-water.' Dr. T. Scott has pointed out the 

 relationship between this genus and Longipedia and Canuella? and recently 

 his son has described additional species of Sunaristes from the Indian Ocean. 

 Mr. Thompson reports several specimens of Ectinosoma normani (T. and 

 A. Scott) as obtained by the latter in material from Barrow Channel, 

 collected by Professor Herdman, adding that ' when fresh this species has 

 a brilliant red spot on the lower angles of the cephalothorax, and in this 

 respect it agrees with E. erythrops (Brady).' 4 E. curticorne (Boeck) is reported 

 by A. Scott from mussel beds at Piel and Morecambe, and from stomachs 

 of young dabs at Blackpool. 5 Bradya minor (T. and A. Scott), reported from 

 mussel beds at Morecambe, has been transferred by Sars to a new genus, 

 Pseudobradya? Euterpe acutifrons (Dana) from Piel, Tachidius brevicornis 

 (O. F. Miiller) from Duddon, Idya furcata (Baird) from Piel and Morecambe, 

 are due to the mussel beds, but as to Tacbidius brevicornis, under a thirtieth 

 of an inch long, Mr. Thompson should also be quoted. He says : ' Length, 

 o'Somm. A brackish water species : we have taken it in quantity from 

 material sent by Mr. Dwerryhouse from a brackish tributary of the Mersey 

 at Hale.' 7 He adds that the broad square fifth feet of the female serve to 

 distinguish it. In describing a new species, Idya elongata, Mr. A. Scott 



1 Op. cit. vii. 1 88. 



* It will perhaps suffice to give here a general reference for the species recorded by Mr. Andrew Scott to 

 his papers in the Trans. Liverp. Biol. Soc. x. 127-131, 134-158 (1896), and vol. xv. 348-351. 



8 Ann. Nat. Hist. (Ser. 6), xx. 489 (1897). 4 Trans. Liverp. Biol. Soc. ix. 100. 



6 Op. cit. ix. 109. ' Crustacea of Norway, v. 40 (1904). 



7 Trans. Liverf. Biol. Soc. vii. 192 (1893). 



172 



