94 
HISTORY OF BRITISH CRUSTACEA. 
Mr. Say^ describes a species of this genus as indigenous 
to the United States ; the exuviae of this, particularly of its 
large front foot, occur very frequently on the sea-beach of 
the southern States, early in the spring. The Crab itself is 
seldom seen, owing to its recluse mode of life. He found 
the living specimen by digging in the sand of the bay shore 
of the river St. John, in East Florida, about eighteen inches 
below the surface. “It had formed a tubular domicile, 
which penetrated the sand in a perpendicular direction to a 
considerable depth, the sides were of a more compact con- 
sistence than the surrounding sand, projecting above the 
surface about half an inch or more, resembling a small 
chimney, and rather suddenly contracted at top into a small 
orifice. The deserted tubes of the Callianassa are in many 
places very numerous, particularly where the sand is indu- 
rated by iron into the incipient state of sandstone; they are 
always filled up, but may be readily distinguished by the 
indurated walls and summit often projecting a little above 
the general surface.” 
Callianassa subterranea, Mont. sp. Mud-burrower . 
(Plate YII. fig. 2.) — Colour during life more or less orange, 
sometimes yellow on the sides and on the tail, the arms 
* Journal of the Academy of Natural Sciences of Philadelphia, i. p. 240. 
