MEMORANDA. 203 
the head, the performance of this function having perhaps 
escaped observation. 
In regard to Pentastoma, I am greatly indebted to Professor 
Busk for having placed in my hands a memoir on the develop- 
ment of this genus by Professor R. Leuckart,* the perusal of 
which has induced me to commence a repetition of that dis- 
tinguished entozoologist’s experiments. The Council of the 
Zoological Society having liberally accorded me an oppor- 
tunity of examining the carcases of certain animals dying at 
the Society’s Gardens, Regent’s Park, the evisceration of a 
Bubale (Antilope Budalis, Pallas), on the 10th ultimo 
(February), fortunately supplied me with fourteen individuals 
of the so-called Pentastomum denticulatum. Nine of these 
entozoa were the next day introduced into the nostril of a 
hound ten months old, and four mto the nasal cavity of an older 
dog—the other solitary parasite being retained for careful 
microscopic examination. 
On the 4th of the present month (March), 7.e., three 
weeks after infection, the first hound was destroyed, but the 
most rigid inspection of the entire nasal, frontal, and facial 
cavities failed to detect a single specimen of our young 
Pentastomata. The second dog has not yet been killed. 
I have thought it right to: place on record this first, 
although a negative, result. Those only who comprehend 
the saving value, in respect of checking the superabundance 
of these and other allied parasites, by obtainmg an accurate 
knowledge of their early wanderings and transformations, 
will understand the reasonableness of continuing these 
helminthological inquiries, in spite of the seeming destruc- 
tion of life which they at present involve-—T. Spencer 
Cosson, London. 
* See Translation, in another part of the present number of this 
‘ Journal.’ 
VOL. VII. R 
