HIGHER CRUSTACEA OF NEW YORK CITY 



185 



Body very convex and capable of being rolled into a ball. 

 Uropoda short. 



Another form which, like Cyclisticus, can roll itself into 

 a perfect ball, and is thus known as a pill-bug. From that and all 

 of our other terrestrial Isopoda it differs in the shape of the terminal 

 uropoda, which are short and do not extend beyond the edges of 

 the adjoining segments. Antennae short. Integument thick and 

 heavy. 



Length 10-12 mm. Color dark gray or nearly black with rows 

 of indistinct, irregular spots. 



Not very common, but specimens have been taken at Bayshore, 



and it will probably be taken within the city limits. Occurs under 



stones and boards. 



EPICARIDEA 



Forms which, as their names indicate, are parasitic on other 

 Crustacea. Owing to their mode of life, their structure is very 

 much modified and degraded, the extent to which it is carried vary- 

 ing in the different species. The males are relatively to the females' 

 very small and are found clinging to the body of the female. Of the 

 four families one, the least degenerate, is represented. 



Family bopyridae 



Body of female distinctly 

 segmented, asymmetric 

 and flattened dorsally. 

 Male more slender and 

 symmetric. 



Parasitic on decapodous 

 Crustacea. 



Probopyrus palaemoneticola 



(Packard) 



Bopyrus palaemone- 

 ticola Packard. Zoology for 

 High Schools and Colleges. 

 1881. p.289. 



Bopyrus sp. Harger. /. c. 1880. p.312. 



Probopyrus palaemoneticola Richardson. U. S. Nat. Mus. 

 Proc. 1904. 27:66, fig.41-43. 



Fig. 59 Probopyrus palaemoneticola: 

 female with attached male, £=male. 



