194 
CLASS CRUSTACEA. 
Athanas, Leach , 
In which the first pair of claws, on the contrary, is more 
bulky than the second. (Athanas nitescens , Leach.) 
The last subgenus of this section, that of 
Pasiph^a, Sav., 
Although very much approximating to many of the preceding 
by the superior antennae being terminated by two threads ; 
by the form of the four anterior feet terminating in a didacty- 
lous forceps, preceded by an articulation without annular 
divisions, and by the shortness of the muzzle or frontal horn, 
yet they differ from them in some relations. An appendage, 
in the form of a thread, or hair, is very distinctly visible at 
the external base of their feet ; these feet, with the exception 
of the claws, which are larger and almost equal, are very 
narrow and filiform ; the body is very much elongated, very 
much compressed, and very soft. ( Alpheus sivado , liisso.) 
Our fifth and last section of macroura, that of Schizo- 
poda, appears to connect the macroura with the following 
order : the feet, none of which are terminated in a forceps, are 
very slender, in the form of lashes, provided with an ap- 
pendage more or less long, proceeding from their exterior 
side, near their base, and exclusively adapted for swimming ; 
the eggs are situated between them, and not under the tail ; 
the ocular pedicles are very short, as in the majority of the 
macroura, the forehead advances into a point, or presents the 
appearance of a sort of beak. The testa is slender ; the tail 
terminates as usual in a fin. These Crustacea are small and 
marine. 
Here the eyes are very apparent ; the lateral antennas are 
accompanied with a scale ; the middle ones are terminated 
by two threads, and composed of many small articulations, as 
well as the preceding. 
