IIl.—ADDITIONS TO THE FAUNA OF THE FIRTH OF FORTH. 
Part IV. By Tuomas Soort, F.L.S. (Plates VII.—XIIZL). 
This, the fourth contribution towards a better knowledge of the 
fauna of the Firth of Forth, especially the invertebrate fauna, includes 
among other interesting forms several species of Copepoda now described 
for the first time, as well as a few not previously recorded for the east of 
Scotland ; also a few species of Amphipoda, rare, or not previously 
recorded for the East Coast. 
The species here recorded or described for the first time for the Firth 
of Forth comprise 25 species of Copepoda, 9 species of Amphipoda, and 
a rare species of Actuniade. 
A description (with figures) is also given of a species of Copepod pre- 
viously recorded in Part ILI. of the Eighth Annual Report, p. 320, im 
order to indicate more satisfactorily its position in the classification. 
In the preparation of this paper I have again the pleasure of gratefully 
acknowledging the kindness of Professor G. S. Brady, F.R.S., also of 
the Rev. A. M. Norman, F.R.S., Rev. T. R. R. Stebbing, M.A, and A: O. 
Walker, F.L.S. I am also much indebted to Dr T. Wemyss Fulton, 
whose active interest in and sympathy with my work is a souree of much 
encouragement. I also desire to say that not a little of my success in the 
study of the organisms recorded in this paper is due to the hearty co- 
operation of Captain R. E, Simpson, and to the intelligent interest 
shown by the mate in the investigations carried out on board the ‘Gar- 
land.’ My son, Mr A. Scott, has prepared the drawings which accompany 
this paper. He has also largely assisted me with the preparation of the 
dissections (a troublesome work) from which the drawings were made. 
Without the drawings it would have been difficult to realise the important» 
and striking characters of the species mentioned, even though these 
characters have been, where necessary, fully described. 
CRUSTACEA. 
IL COPEPODA. 
GNATHOSTOMA. 
family CALANIDE. 
Acartia bifilosus (Giesbrecht). (Pl. VII. fig. 14). 
1881. Dias bifilosus, Giesbrecht, ‘Die Freilebenden Copepoden 
der Kieler Foehrde,’ p. 147, ‘pl. il. figs. 4, 22, 23, Ma ss 
Habitat.—In the vicinity of Culross, near the head of the Forth 
estuary, # number of specimens were obtained among material collected 
with a small beam-trawl-like tow-net, designed by Professor M‘Intosh,; 
and worked from a rowing or small sailing boat. Acartia bifilosus closely _ 
resembles Acartia longiremis, and requires to be very carefully diagnosed to 
distinguish it from that species. The inner spines of the fifth pair of 
Be ey “See ee ae 
PENA eo Pee egies at ee teem gee See 
* Vierter Bericht der Commission zur wissenchaftlichen Untersuchung. der- deutschen aay 
Meere, in Kiel, 1887-1881. 
+ We find this net a most effective apparatus for capturing micro- -organistos and 
young fish should any be present to capture. Seed 
