C. Warburton and Gk H. F. Nuttall 75 
of the ani. This specimen was comprised in the same lot as the normal 
male depicted in Figs. 19 and 20. 
In Figs. 25 and 26, the monstrosity, by duplication of the posterior parts 
of the body, is still more marked. We are indebted to Dr W. M. Graham 
(W. African Medical Service) for this remarkable specimen which he 
collected at Accra in June, 1908, off a dog. The specimen ( Rhipi- 
cephalus sanguineus 2'8 mm. long) is more markedly teratological than 
the preceding specimen ; the two adanal pairs of shields are completely 
developed and a single median circular spiracle is observable dorsally 
From W. Africa. (G. H. F. N.) 
lying in a deep pit. The creature presents a fairly normal appearance 
anteriorly. There are 11 festoons on each side of the median spiracle; 
the dorsal grooves are normal externally but reduced medially owing to 
the fusion of the body in the median line. As in the specimen of 
Boophilus (Fig. 19) the legs appear normal. 
To our knowledge, no similar instances of monstrosity have hitherto 
been recorded as occurring in Ixodoidea. 
The expenses of these investigations are being partly defrayed by 
the aid of a grant from the Government Grants Committee of the 
Royal Society. 
