PHRYXUS. 233 



immersed in spirits), hence the body is nearly parallel at 

 the sides. 



Each segment bears a pair of rather strong legs, formed 

 for walking, terminated by a semi-ovate hand, with a sharp 

 hook-like finger. 



The pleon forms a subconic-ovate mass, with all the 

 segments closely soldered together, indicated more or less 

 distinctly by lateral incisions. 



The full-grown female is a large inert nearly globular 

 mass, with the segments scarcely indicated by depressions, 

 and with a series of wide and broad ovigerous plates, 

 which fold backwards and envelop the upper-side of the 

 body. 



The cephalon is furnished with very short antennae, 

 resembling those of the male in structure, and the mouth 

 forms a large conical tubercle rounded at the extremity. 



The pereiopoda are inclined towards the back, and 

 formed as in the female Bopyri, with the articulations 

 much less distinct than in the males, and the propoda are 

 small and weak, with a small curved obtuse dactylos. 

 These limbs are irregular in size on the two sides of the 

 body, some of them being even obsolete on one or other 

 side. 



The pleon is composed of small joints, furnished with 

 elongated lobes or plates for breathing, varying in number 

 and size in the different species, the terminal joint being 

 small and bifid in the typical species. 



We have added to the genus several species, the females 

 of which possess more or less elongated appendages to 

 the segments of the tail, but differ from the typical 

 species in having the body in the same sex symmetrical, 

 or nearly so ; on this account one of these species has 

 been formed by M. Hesse into the genus Pleurocrypta, 

 which we have not thought necessary to retain. 



