FRESH- WA TER AMPHIPODA— WECKEL. 



47 



In GammarKS fasciatus the inner ramus is only slightly narrower than 

 the outer and at least three-fourths as long. 



Length, 10-15 mm. 



Specimens of this species have been collected in several localities in 

 regions about Mammoth Cave, Kentuck}', the type coming from a 



Fig. 1L— (iAMMARus pROPiNyrrs, male. Mammoth Cave, Kentucky. 



spring about 2 miles north of this cave; collected also in springs in the 

 Ozark Mountains, Missouri, and in West Virginia. 



GAMMARUS Ci^iCUS, new species. 



Eyes absent. First antenna more than half as long as the body; 

 second segment of the peduncle slightly longer than the tirst and 

 about three times as long as the third; liagellum composed of twenty 

 to thirty elongated segments, each bearing a few short hairs at the 

 distal end; secondary iiagellum reaching slightly beyond the third 

 segment of the primary flagellum, composed of four segments, the 

 distal one short and furnished with long hairs. 



Second antenna^ are about two-thirds as long as the tirst pair with 

 the peduncle extending fai- beyond that of the first pair; ultimate 

 segment of the peduncle only^ slightly longer than penultimate which 

 is greatly elongated and about equal in length to the antepenultimate; 

 flagellum composed of about twelve segments, which are shorter than 

 those of the first antennae and furnished with more hairs. 



The carpus of the tirst gnathopods of the, male is triangular and 

 elongated with the anterior margin furnished with a few long hairs 

 and numerous short ones; propodus narrower than the carpus, twice 

 as long as broad, with the anterior margin concave, armed sometimes 

 with a fascicle of hairs, the posterior margin convex, and the palm 



