266 Illinois State Laboratory or' Natural History. 



blunt point and armed on the outer margin with three spines. 



Left fifth leg very peculiar, consisting of a single lamelli- 

 form subcircular segment, armed on the flat surface with two 

 opposable claws forming a forcipate structure. 



Fifth pair of legs of female uniramose, three-segmented 

 (two basal segments). First segment about twice as long as 

 broad. Second segment narrower than the preceding and 

 about twice as long ; armed at about the middle of the outer 

 margin with a spine. Third segment curved inward, some- 

 what longer and narrower than the second, ending in a sharp 

 point, and armed on the outer margin with two spines divid- 

 ing it approximately into thirds. 



Mulberry Creek, Cullman county, Alabama. 



Length, about 1.103 mm. 



The above description was compiled .from drawings and 

 descriptions found in Herrick's writings (Herrick, '83a, '84, 

 and '87, and Herrick and Turner, '95), since all attempts to 

 obtain material from Cullman county, Ala., or from any 

 other part of that State, were unsuccessful. 



A brief discussion of the published figures and descriptions 

 will not be superfluous in connection with' a doubtful species. 

 In the American Naturalist, Vol. 17 (Herrick, '83a), is pub- 

 lished the original description of E. fluviatilis, and a figure 

 representing apparently a ventral view of the last thoracic 

 segment and abdomen, and the fifth pair of legs of the male. 

 In this drawing the process on the third segment is on the 

 right side, making it sinistral in the animal as Herrick says 

 it is ; but in his " List of Fresh-water and Marine Crustacea 

 of Alabama" ('87) he gives another figure, which is just as 

 apparently a ventral view of the same thing. In ttris latter 

 figure, however, the process is sinistral, making it dextral in 

 the animal, and also making the left leg three-segmented 

 and the right leg one- segmented. Two other figures (Her- 

 rick, '84 and Herrick and Turner, '95) also show the process 

 on the right side, but there is nothing to indicate whether 

 they are dorsal or ventral views. 



Now, in regard to the synonymy. If the process is on the 

 left side, as is maintained in all of Herrick's descriptions, this 



