HIGHER CRUSTACEA OF NEW YORK CITY 



153 



other form, in the lack of a secondary flagellum to the antennulae 

 and in the gnathopoda. The first pair of these are small and sub- 



Fig. 19 Allorchestesdentata (After Smith) 



chelate in both sexes, and the second are small in the female and 

 large in the male. 

 Length 4.5-6.5 mm. 



Occurs in the fresh-water ponds and stagnant pools throughout 

 the city. 



Allorchestes littoralis Stimpson 



Allorchestes littoralis Stimpson, W. The Marine Invertebrata 

 of Grand Manan. Smithsonian Contributions to Knowledge, 6. Wash. 1854. 

 Hyale littoralis Verrill. /. c. 1874. p. 556. 



Fig. 20 Allorchestes littoralis 



Antennae less than one third length of body, much stouter than 

 antennulae and with thick fascicles of hairs. First gnathopoda 

 small, subchelate and alike in both sexes. Second gnathopoda of 

 similar form in both sexes but much larger in the male. 



