OUR CARCINOLOGICAL FRIENDS. 93 
shell occupied by it. In the more common form 
of the small shells (Hupagurus longicarpus), which 
rarely attains a length much exceeding one inch, 
the legs are all much elongated, giving the animal 
a very slender appearance. — 
SHRIMPS AND PRAWNS. 
Of the long-tailed ten-footed crustaceans (Ma- 
crura) the best-known representatives are the lob- 
ster, shrimp, and prawn. The first, which is too 
familiar to require special notice, can scarcely be 
considered to be a true member of the New Jersey 
coast fauna, having been introduced with the build- 
ing of the Delaware breakwater, where it has se- 
cured somewhat of a permanent footing. Its rarity 
otherwise must be attributed to the absence of an 
environment suited to its living and development. 
The rocky shores of the North constitute its true 
home, and although stray individuals are found 
farther south, they rarely appear below the East 
River. The species sometimes attains an enormous 
size, individuals frequently weighing as much as 
fifteen to twenty pounds, and occasionally passing 
much beyond this limit. An animal somewhat re- 
sembling the lobster, although considerably smaller 
in size—measuring only three or four inches in 
length—is the Grebia affinis (Pl. 6, Fig. 6), a pro- 
found burrower of the mud-flats. 
The shrimps and prawns, which much resemble 
one another, are abundant in the bays and harbors, 
passing up to considerable distances in the tidal 
streams and creeks, They are active little creatures, 
