1909. | ECTOPARASIVES OF THE RED GROUSE. 329 
Cestopa (Tape-worms) : 
(1) Cysticercus arionis v. Sieb.* 
(2) Cysticercus tenice arionis v. Sieb.T 
Nematopa (Round-worms) : 
(1) Leptodera angiostoma Duj. = 
(2) Leptodera appendiculata Schneider §. 
(3) Nematodum limacis atra v. Sieb. || 
(4) Pelodytes hermaphroditus, Schneider 4. 
We have cut one of these slugs into sections, and have sought 
diligently through them for cysts of tape-worms, but have found 
none. This absence of infection, combined with the great rarity 
of the slug in the grouse’s crop, seems to show that A. empiricorum 
is not the second or larval host of the grouse cestodes. 
Dr. Wilson and Mr, Fryer “tow-netted” some of the moor 
streams in April 1907, and found a certain number of the 
nauplius larva, probably of Cyclops, and a certain but small 
number of adult Cyclops. The numbers were, however, meagre, 
and tow-nettings later in the summer yielded an even more 
unsatisfactory “bag.” None of the crustacea when examined 
microscopically showed any cysts, and as they were few in number 
and quite cyst-less, it seems improbable that the source of the 
tape-worm infection lies here. 
Mr. D. J. Scourfield, who kindly looked through some of these 
tow-nettings, tells me he found the following species of Ento- 
mostraca :— 
CLADOCERA. 
Chydorus sphericus O. F. M., the most abundant form. 
Alonella nana (Baird, Norman & Brady), frequent. 
Alonella excisa (Fisch.), frequent. 
Acantholeberis curvirostris (O. F. M.), a fair number, with 
some cast ephippia. 
COPEPODA. 
Cyclops nanus Sars, a few. 
Cyclops languidus Sars, a single specimen only seen. 
Cyclops vernalis Fisch., again only one specimen was seen. 
T subjoin three more lists of tow-netted freshwater Entomostraca: 
from three different lochs. These were collected and identified 
by Mr. Wm. Evans, who has kindly put them at my disposal, and 
they clearly indicate the sort of surface fauna which may be 
obtained from the lochs on the Scotch moors in early autumn. 
Von Siebold, Zeitschr. wiss. Zoo]. 11. 1850, p. 202. 
Krabbe, Nye Bidrag, p. 5; and Villot, Ann. Sci, nat. 6th ser. xy. 1883. 
Schneider’s Monograph, p. 157. 
Schneider’s Monograph, p. 159. 
|| Schweiz. Zeitschr. Med. 1848. 
4 Zeitschr. wiss. Zool. x. p. 176. 
Proc. Zoou. Soc.—1909, No. XXII. LD) 
rt 
