164 ANTHURIDA. 
the first pair are large, and have the external branch 
narrow, and attached so as to lie upon the outer margin 
of the other, which is ovate and foliaceous; the four 
pairs next succeeding are ovate, membranous, and folia- 
ceous. The posterior pair are articulated to the sixth 
segment dorsally. The upper and outer branch is folia- 
ceous, and affixed vertically; the inner and inferior 
branch is two-jointed, and placed horizontally below 
the plane of the middle tail-piece, which is ovate, and 
terminates in an obtusely pointed apex. 
There is a species of this genus, an inch in length, in 
the Museum of the Jardin des Plantes, from Port 
Western, New Holland. 
