SLOW SHRIMP. Axiui ttirhynchu*. 



MUD BURROWE&. CttUtonOfM subternm.n 



the true lobster. Sometimes it is found entangled in the nets, and even upon the fisher- 

 men's lines. 



The average length of this species is eighteen inches, and its weight about five pounds, 

 when adult. Its colour is purple-brown, with some irregular white spots, and its legs are 

 reddish-white, banded longitudinally with brown. One species of this genus, Palinurus 

 ornatus, sometimes attains to an enormous size, measuring from the end of the antennae to 

 the tail rather more than four feet. 



ON the preceding illustration are exhibited two more specimens of the British Crustacea. 

 Both of them belong to a family called the Thalassinidas, in which the abdomen is long, 

 its integuments rather soft, and the carapace small and compressed on the sides. 



The MUD-BURROWER is found on our own coasts, but is not very often seen, as it lives 

 in a burrow some two feet under the surface of the mud. It forces itself beneath the 

 mud by means of the third pair of legs, and there passes the greater portion of its time. 

 The shell of this species is very thin, and but for the enormous claw with which it is 

 furnished, it would seem quite a helpless creature. 



One species of this genus, the GREAT BURROWING CRAB (CalUanassa major], inhabiting 

 Florida and other parts of America, forms a very remarkable burrow ; Mr. T. Say, who 

 found this creature by digging in the sand, giving the following account of its habits. 

 " 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 consistence 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 indurated, 



