CRUSTACEANS 



remarks that only a few specimens were obtained ' from the mud collected 

 on the mussel beds between Morecambe and Heysham,' and that the elongate 

 form of the animal, the short first antennas and the small fifth feet are among 

 its distinctive characters. Idya minor (T. and A. Scott) was taken by the 

 latter at a very low ebb near Piel. Thalestris harpactoides (Claus) has been 

 found at Duddon by A. Scott ; Canthocampus minutus (Jurine) by Weigh tman 

 at Seaforth.^ C. palustris (Brady) is thus noticed by Scott : ' A considerable 

 number of specimens of a copepod apparently belonging to this species 

 were washed from mud adhering to samples of mussels (Mytilus edulis) 

 sent from the St. Anne's mussel beds near Lytham ; one of the samples 

 was from that part of the beds which never becomes dry at low water, and 

 was obtained by means of a " mussel rake " ' ; the specimens, it is added, 

 ' differ a little from the figures given by Dr. Brady.' ^ Thompson reports 

 Mesochra lilljeborgii (Boeck) as ' found in mud taken in a brackish tribu- 

 tary of the Mersey at Hale ' ; Paramesochra dubia (Scott), ' in mud collected 

 by Mr. Corbin from the Duddon cockle beds at the mouth of the River 

 Duddon, near Barrow'; Tetragoniceps bradyi (Scott), 'found only at same 

 times and habitat as the last named species ' ; and Cletodes linearis (Claus), ' in 

 mud from Hale shore taken at low water.' ^ C propinquus (Brady and 

 Robertson) is reported by A. Scott from Piel and Morecambe ; Laophonte 

 serrata (Claus) and L. lamellifera (Claus) from Piel ; h. curticauda ( Boeck) 

 from Duddon ; L. intermedia (T. Scott) from Duddon and Morecambe. 

 Delavalia palustris (Brady) is reported from Duddon by Scott, and from Hale 

 by Thompson, who speaks of it as a mud-loving species, of which the male is 

 very rare. Jonesiella hyance (I. C. Thompson) has been found at Ulverston 

 in the stomach of a young dab,* but, as Sars has pointed out, the dab of the 

 fiiture must be entreated to consume it under the earlier generic name of 

 Danielssenia (Boeck). ^ Ameira exigua (T. Scott) has been found by A. Scott in 

 the mussel beds at Piel. A. exilis (T. and A. Scott) is noted by Thompson, 

 who writes : ' This slender and characteristic species was taken amongst 

 material collected from holes dug in the soft mud near the remains of the old 

 steamboat pier, Piel; not uncommon; March, 1899.' He also names 

 Stenhelia intermedia (T. Scott) as taken ' in the same locality as the last ; 

 August, 1898 ; rare.'* Concerning Nannopus palustris (Brady), Mr. A. Scott 

 writes : ' Several specimens of this species were obtained in the mud collected 

 from the Fleetwood oyster beds. It seems to be a brackish water species, 

 and in general appearance is very like Platychelipus littoralis, another brackish 

 water copepod ; it can be distinguished from that species, however, even 

 without dissecting, by making an examination of the fifth pair of feet and 

 also of the inner branches of the third and fourth pairs of feet. Nannopus 

 palustris has two ovisacs and Platychelipus littoralis one only.' Of P. littoralis 

 (Brady) Mr. Thompson had earlier reported that ' this striking species occurs 

 in abundance in mud taken at low water ' at Hale and various other places, 

 males and females being about equally plentiful.'' 



We now leave the Arpacticidae, and must pause over only a few of the 

 remaining species, many of which are semi-parasitic or wholly parasitic, and 



1 Fauna of Liverpool, 55. ^ Trans. Liverp. Biol. Soc. x. 140. s Qp. cit. vii. 197, 200. 



* Op. cit. ix. 109. 5 Annuaire Mus. Zool. Acad. Imper. St. Petersbourg, Jana Exped. p. 21 (1898). 



6 Trans. Liverp. Biol. Soc. xiv. 140 (1900). '' Op. cit. vii. zoi. 



173 



