64 REPORT OF NEW JERSEY STATE MUSEUM. 



Scapholeberis mucronata (Miiller). 

 Plate io. 



Daphne mucronata Miiller, Zool. Dan. Prodrom., 1776, p. 200. Denmark. 

 Scapaoleheris mucronata Underwood, Bull. 111. Lab. N. Hist., II, Oct. 1888, 



p. 340. Eastern United States. 

 Scapholeberis mucronata Herrick and Turner, Geol. N. Hist. Surv. Minn., 



Zool. Ser., II, 1895, p. 174, PI. 43, figs. 4-7, PI. 45, fig. 5. Eastern United 



States. 

 M. J. Rathbun, Occas. Papers Boston Soc. N. Hist., VII, No. 5, 1905, 



p. no. All Europe and eastern United States. 



Description. — Body of rather irregular semi-circular contour, 

 that of back convex and of ventral region nearly straight, ending 

 behind in short spine at each posterior angle of shell. These 

 spines quite short and barely equal head or one-fourth length of 

 shell. Lower straight edge of shell with a series of moderate 

 fine spines. Head rather large, round in front of large eye. A 

 short rounded beak on lower surface of head. Antennules short, 

 behind and below beak. Fornices very short, rounded, connected 

 by a line with beak by a sudden downward deflection, this off- 

 setting area forming part of basin of antenUcC. Second line 

 springs fromi just above end of fornices and passes over eye by 

 broad curve. Post-abdomen truncate, has beside terminal claws 

 four or more spines rapidly decreasing in size. Claws minutely 

 spined. Color usually dark brownish. Length 0.6 to 0.8 mm. 



Remarks. — I first miet with this species in pools about South 

 Dennis on April 5th, 1912, when a few were found in company 

 with Burycercus and Chydorus. In May it was found in a little 

 tributary of the Delaware just below Florence, also associated 

 with Chydorus. On July 4th, 19 12, it was found fairly common 

 in a tributary of Crosswicks creek near Trenton, where it was 

 associated with Scapholeberis armata, Cyclops serndatus and 

 other species of Cyclops. Likely it is common in many places 

 throughout the State. It is widely distributed in Europe and 

 North America. 



