CRUSTACEA OF ALABAMA. 13 



in the fresh-waters of the Old World. It would seem to be more prolific towards the 

 south and may belong to a southern fauna of which we have other indications. 



Genus Epischura. (Forbes.) 



Closely resembling the European genus Heterocope, the place of which it takes in 

 America. Thorax moderately slender, six-jointed, rounded in front, cervical suture evi- 

 dent ; abdomen five-jointed in the male, three-jointed in the female, in the male with a 

 prehensile appendage upon the second segment, sometimes assisted in its function by 

 the modified remaining segments ; antennas 25-jointed, somewhat geniculate on the right 

 side in the male, shorter than the body ; jaws with about seven to eight teeth ; second 

 maxilliped with strong spines, five- or six-jointed ; legs of the first four pairs all with one- 

 jointed inner rami ; fifth feet of female with one ramus each, similar, of the male unlike, the 

 right forming a more or less perfect dactyl, while the left is similar to those of the female; 

 caudal stylets short, with but three spines. Two species are known, one (E. lacustris) 

 from the Great Lakes, the second from rapid mountain streams in Alabama. E. lacus- 

 tris has the abomen curved in both sexes, while in the male it is curiously modified and 

 armed and has the stylet of one side similarly affected. Our species is less highly mod- 

 ified though the abdominal processes are more free hence requiring less intervention of 

 the abdomen itself. 



Episcura fluviatilis. Ha 



rick. 



Of small size (.045 in. long.) Body rather slender, color greenish blue. The ab- 

 domen is perfectly straight and the three caudal setae are of nearly equal size. The ab- 

 domen of the male is straight, but has a strong process on the left side which bears a 

 movable claw laterally and a small second segment which terminates in two small spines. 

 Antennae of moderate length, in the male geniculate beyond the twentieth segment, 

 joints fifteen to twenty slightly thickened and spiny ; antennule with eleven spines 

 upon the terminal joint of two-jointed ramus ; jaws eight-toothed, most of the teeth emar- 

 ginate ; palp bi-ramose, one-jointed ramus with five spines ; swimming feet similar, the 

 inner, one-jointed ramus with five setae ; fifth feet of the female slender, three-jointed, ter- 

 minal joint extending into a claw and armed with two small spines. Spermatophore as 

 in Diaptomus. This very peculiar form was found in Mulberry creek, Cullman county, 

 Alabama. * 



FAMILY CYCLOPIDIjE. 



This family differs from the Calanidae in the rather shorter antennae, simple 

 four-jointed antennae, rudimentary fifth foot, double ova-sac and the absence of the heart. 

 The antennae of both sides are modified in the male, while the fifth feet are not subject 

 to modification. The genus Cyclops alone represents the family in fresh water. No 



