THE CRUSTACEA OF NEW JERSEY. 65 



Scapholeberis armata Herrick. 

 Plate ii. 



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

 p. 2>7- Mobile, Alabama. Minnesota. 



Description. — Body rather oblong", back scarcely more convex 

 in profile than ventral surface or edge, and latter ending behind 

 in long spine, often equaling 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 antennas smiall, upper lines meeting behind eye. Post- 

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

 ish. Length 0.8 mm. 



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

 the Delaware below Florence, in May of 1912. It was very 

 abundant in a tributary of Cross wicks creek near Trenton on 

 July 4th, 191 2. 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 United 

 States. 



Although Herrick refers in the above-quoted work to this 

 species in the American Naturalist for 1883, as Scapholeberis 

 mticronata var. armata, I cannot find it in the volume before me. 



Tribe Ctenopod.v. 



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

 A single family in our region. 



Pa I nil y SIDIUTE. 



Head separated fromi body by a depression, without prominent 

 fornices (or spreading shields) over base of antenn?e. First 

 pair of antenn?e, or antennules, one-jointed, usually ratlier small 



S MU 



