THE CRUSTACEA OF NEW JERSEY. 65 



Scapholeberis armata Herrick. 

 Plate ii. 



Scapholeberis armata Herrick, Mem. Den. Sci. Assoc, I, Oct. 1887, No. i, 

 p. 37. Mobile, Alabama. Minnesota. 



Description. — Bod}' rather oblongs, back scarcely more convex 

 in profile than ventral surface or edg'e, and latter ending behind 

 in long spine, often ecjualing entire lower margin of shell in 

 length. Lower edge of shell with a series of fine hairs, each 

 moderately long. Head rather large, rounded in front. On 

 lower surface of head a short rounded beak. Eye large. Anten- 

 nules short, below beak. Fornix rather broad, somewhat square, 

 basin of antennre small, upper lines meeting behind eye. Post- 

 abdomien truncate, with four terminal claws. Color dark brown- 

 ish. Length 0.8 mm. 



Remnrks. — First found with the preceding in the tributary of 

 the Delaware below Florence, in May of 19 12. It was very 

 abundant in a tributary of Cross wicks creek near Trenton on 

 July 4th, 1912. About Philadelphia, in Pennsylvania, I have 

 also found it at Holmesburg, in pools, and in a pond near Elkins 

 Park. It is evidently -a species of wide distribution in the LInited 

 States. 



Although Herrick refers in the above-quoted work to this 

 species in the American Naturalist for 18813, ^-s Scapholeberis 

 mucronata var. arnmta, I cannot find it in the volume before me. 



Tribe Ctenopoda. 



Feet in six pairs, alike, foliaceous and all branchiate. 

 A single family in our region. 



Family SIDID.E. 



Head separated fromi body by a depression, without prominent 

 fornices (or spreading shields) over base of -antennae. First 

 pair of antennae, or antennules, one-jointed, usually rather small 

 5 MU 



