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 diifer 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, Avhich are larger and almost equal, are very 

 narrow and filiform ; the body is very much elongated, very 

 much compressed, and very soft. {Alpheus sivado, Risso.) 



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 antennae are 

 accompanied with a scale ; the middle ones are terminated 

 by two threads, and composed of many small articulations, as 

 well as the preceding. 



