244 
STRANGE DWELLINGS . 
the tube on the least alarm, and contracting the orifice after it 
has retired into seclusion. 
Should the reader happen to be an entomologist, he will ! 
readily call to mind the tiny cylindrical cases that are made 
by certain lepidopteran larvae, belonging to the great family 
Tineidae, and which are found so plentifully upon the leaves of 
oak, hazel, and other trees. If he should happen to be some- 
thing of an aquarian naturalist, and fond of looking for marine 
curiosities, he may find attached to submarine plants, certain 
little cylindrical cases which are wonderfully like those of the 
moths. They are very small indeed, scarcely thicker than the 
shaft of an ordinary pin, and measuring scarcely more than the 
eighth of an inch in length. Their colour is pale brown, their !i 
surface is rough, and they are stuck upon the seaweed in great 
confusion, without the least attempt at arrangement. 
v These are the habitations of a very small crustacean ( Cerapus 
tubularis ), popularly called the Caddis Shrimp, because the tube 
which the creature makes is analogous to that which is formed 
by the caddis larvae. The animal which inhabits this case is a 
curious little being, very like the long-bodied, long-legged, 
caprellae, that are so plentiful among seaweeds, and furnished 
with two pairs of long and stout antennae, and two pairs of : 
grasping feet. As the tube is too short to contain the entire 
animal, the long antennae are always protruded, and occasionally 
the powerful grasping feet are also thrust out of the opening. 
The antennae are continually flung forward and retracted in a ! 
manner that reminds the observer of the movements of the acorn 
barnacle, each grasp being evidently made for the purpose of { 
arresting any passing substance that may serve for food. This 
remarkable little crustacean is generally found upon the well- 
known alga which produces the Carrageen, or Irish moss j 
(' Chondnis crispus ). It will not, however, be found upon those 
plants which can be plucked by hand, but resides in deeper 
water, so that the best method of procuring it is to go out in a j 
boat, throw the drag overboard, and then examine the algae 
which are torn from their attachments. 
