162 



Part III. — Sixteenth Annual Report 



Mysidoxms angusta. The only records of this species are all for 1890 

 except one, and comprise one for Stations I. and III. in October, and 

 one for Station V. in October, November, and December in 1890, and one 

 for Station III. in 1891. 



Leptomysis Ungoura is recorded once during the seven years — viz., for 

 Station III. in March 1892. 



Hemimysis lamornce. This Schizopod is recorded three times in 1892 — • 

 viz., twice for Station I., once in January and once in March, and for 

 Station IX. in December. The species is recorded again in 1893 for 

 Station Y. in January, and in 1895 for Station III. in February and 

 Station VIII. in December. 



Macropsis slabberi, remarkable among British Schizopods for the 

 length of the eye-stalks, is of frequent occurrence over a considerable 

 portion of the Forth estuary, and specially in the upper reaches. While 

 several of the species mentioned here may be regarded as only visitors, 

 this appears to be a resident, at least in that part of the Firth which 

 extends westward from Queensferry. In this part of the Forth, which may 

 be considered the headquarters of the species on the East Coast of Scot- 

 land, it may sometimes be found in large numbers, and its presence 

 seaward may be due to the overcrowding in these waters causing a greater 

 amount of migration to take place, though it is also possible that the 

 species may be resident in the seaward as well as the landward part of 

 the Firth. The records of the species that have to be noted in connec- 

 tion with the present inquiry are the following : — The first reference to 

 Macropsis occurs in February 1890 for Station lY., and again for the 

 same station in March. There is no further record of it till October, 

 when it is again recorded for that station and also for Stations I. and III. 

 It is again recorded for the same three stations in November, and the 

 November record for Station lY. is for both surface and bottom tow-nets, 

 while the others are for the bottom tow-nets only. In 1891 there are 

 records of this species for Stations III. and lY. in January, for Stations 

 I. and III. in October, and in the same months for Station lY. The 

 October record for Station lY. is for the surface tow-net. In July of 

 the same year Macropsis is recorded as frequent in a surface tow-net 

 gathering at Station YIII. in July, which seems to indicate a consider- 

 able migration of the species seaward, either from the upper parts of the 

 estuary or elsewhere. In 1892 it is recorded for Station I. in January 

 and for Station lY. in March. In 1893 the first record is for Station lY. 

 in January, while the next records are for Stations I. and III., the first 

 being for No^rember, the other for October. There are no records of 

 Macropsis for 1894. The records for 1895 include one for Station III. 

 in February and another for the same station in October. There is one 

 for Station lY. in February, and two for the same station in October, one 

 for the surface tow-net and one for the bottom tow-net ; and another for 

 the same station in December. 



Pr annus flexuosus. This species, which is more familiar by its older 

 name of My sis chamceleon or Mysis flexuosa^ is, though a common one, in- 

 frequent among the tow-net invertebrates from the selected stations. In 

 1892 it is recorded for Station lY. in January and March; in 1893 for 

 Station III, in December; in 1894 for Station III. in February; and in 

 1895 for Station lY. in January, and for the same station in February. 

 Praunus flexuosus was observed only among bottom tow-net gatherings. 



