362 ON TAPE-WORMS OF THE RED GROUSE. | Mar. 16, 
Nore sy Wm. Byarave, M.A., oN THE SEARCH FOR Cysts. 
Since September 1908 I have been making a series of investi- 
gations in connexion with the Grouse-Disease Inquiry. My work 
has consisted of a careful examination of the tissues of certain 
insects found on Grouse-moors in various parts of England and 
Scotland, the object being to discover, if possible, cysts of the three 
species of tapeworm which infest the grouse, viz. :— 
Davainea wrogalli (Modeer, 1790). 
Davainea cesticillus (Molin, 1858). 
Hymenolepis microps (Diesing, 1850). 
The insects examined to date are specimens of Scatophaga 
squalida from Ballindalloch, and S. stercoraria from Burley, 
Dunachton, and Forrigen. 
- The specimens were sent to me by Mr. P. H. Grimshaw, from 
the Royal Scottish Museum, Edinburgh, preserved in spirit. 
The method of examination was as follows :— 
The legs and head were removed and the body of the insect 
teased up in 70 per cent. alcohol as finely as possible with needles, 
the legs and head being firstly teased and then gently pounded in 
a mortar. 
The material thus obtained was examined under a cover-glass, 
a mechanical stage being used to ensure that none of the material 
was overlooked. The powers used were Leitz Obj. 1” and 3” 
Oc. 2 and 4; an oil immersion-lens being used in cases of doubt. 
So far the examination has yielded no results. Nothing has been 
found which in any way resembled the cysts, one or two of 
which have been figured, of species allied to the three tape-worms 
mentioned above. 
EXPLANATION OF THE PLATES. 
Pratt LVI. 
Fig. 1. View of a portion of the small intestine of the grouse well infested with 
Davainea wrogalli (Modeer) and cut open to show the worms. 
Pratre LVII. 
Fig. 2. A single specimen of D. wrogalli, isolated to show the attenuated head. 
4. A single specimen of Hymenolepis microps, isolated. 
(The figures 2 and 4. are very slightly magnified.) 
Prare LYIII. 
Fig. 3. View of a portion of the duodenum of the grouse, well infested with 
Hymenolepis microps (Diesing), cut open to show the worms. 
Prats LIX. 
Fig. 5. Head of D. wrogalli with proboscis half-exserted and armed suckers, 
6. The same, with the proboscis completely retracted. This specimen shows 
the calcareous bodies well. 
7. Portion of the double circle of hooks from the proboscis of D. wrogalli. 
8. Isolated hooks from the same, showing slight modification in outlines. 
9. Portion of the ring of hooks which surrounds one of the suckers of 
D. urogalli, showing the irregular arrangement of the hooks. 
10. Isolated hooks from the same, showing slight modification in outline. 
