principally marine, found on the South Coast of Devonshire. 18 
sideways it was obvious the stellate appendages issued from the 
lower lobe. 
The very singular structure of this insect, which at first ap- 
pears to be a strange deformity of nature, and excites our asto- 
nishment, will, like all other creatures constructed by the same: 
omnipotent hand, be found to be most admirably contrived for 
all the purposes of its creation; and the scrutinizing naturalist 
will soon discover this unusual conformation to be the character 
which at once stamps its habits and ceconomy. 
The motion of this insect is so extremely quick that it surpasses 
every species I have hitherto noticed: it transports itself with 
such celerity from one part of the animal it inhabits, to the op- 
posite and most distant, although obstructed by the extreme 
thickness of the fur, that it is not readily taken. When it applies 
the proboscis to the skin of the bat, it reclines on its back, and by 
_ this means it holds most securely by its claws to the larger hairs. 
When two or three were put into a small phial, their agility 
appeared inconceivably great; for, as their feet are incapable of 
fixing upon so smooth a body, their whole exertion was employed 
in laying hold of each other, and in this most curious struggle 
they. appeared to be actually flying in circles; and when the 
bottle was reclined, they would frequently pass from one end to : 
the other with astonishing velocity, accompanied by the same gy- 
ations: if. by accident they. escaped each other, they very soon 
became motionless; and as quickly were the whole put into motion 
again by the least touch of the bottle, or the movement of an 
individual. In this situation they survived two or three days. 
Besides this species I found on Vespertilio Ferrum-equinum an 
Acarus with a pale lead-coloured ovate body, and eight extreme- 
ly long and slender legs, and the valves of the proboscis. very 
conspicuous. 
