38 U.S. NATIONAL MUSEUM BULLETIN 25 9 



paratypes from Skyline Caverns as follows: J. Fowler, Dec. 22, 1940 and Feb. 9, 

 1941 (USNM); J. P. E. Morrison, Jan. 19, 1941 (USNM); L. Hubricht, Aug. 14, 

 1939 and June 4, 1952 (LH); T. C. Barr, Jr., Aug. 21, 1958 (LH). Additional 

 material: west Virginia. — Jefiferson Co.: Molers Cave, J. R. Holsinger, July 7, 

 1962 (JRH). MARYLAND. — Washington Co.: Dam Number 4 Cave, D. Franz, 

 Nov. 23, 1963 and Mar. 4, 1965 (JRH). Pennsylvania.— Franklin Co.: Needy 

 Cave, R. Bray, Feb. 22, 1940 (USNM). 



Diagnosis. — Distinguished from other species of the emarginatus 

 group by more elongate appendages, more spines on outside of pos- 

 terior angle of 1st gnathopodal propod, by the reduced and 1-spined 

 ramus of 3rd uropod, and by larger size of mature females. Largest 

 males, 10.50 mm; largest females, 18.00 mm. 



Antenna 1 up to more than 70 percent as long as body and more 

 than 50 percent longer than antenna 2 ; primary flagellum with up to 

 35 segments in males, up to 42 segments in females. Antenna 2: 

 peduncular segments 4 and 5 rather setose; flagellum with up to 8 

 or 9 segments. Mandibular palpal segment 3 rather stout, with 9 

 or 10 long setae; segment 2 with about 16 setae. Maxilla 1, inner 

 plate with 9 apical, plumose setae. Maxilla 2, inner plate with 10 

 long, obUquely placed, plumose setae. Maxilliped, outer plate 

 reaching beyond apex of 1st palpal segment. Inner lobes of lower 

 lip small. 



Gnathopod 1: propod palmar margin oblique, slightly convex, 

 armed with a double row of about 17 spine teeth; posterior angle 

 with 6 large, unequal spines on outside, 4 smaller spines on inside; 

 lateral setae mostly doubly inserted; dactyl claw short. Gnathopod 

 2: propod palmar margin relatively straight or slightly convex, 

 armed with a double row of about 15 spine teeth; posterior angle with 

 1 large spine on outside, 2 or 3 smaller spines on inside; posterior 

 margin with 4 sets of setae; lateral setae in transverse rows, doubly 

 or triply inserted; claw of dactyl short; coxal plate with 7 marginal 

 setae. Coxal plate of pereopod 3 with 4 spinules and 6 setae mar- 

 ginally; that of pereopod 4 with 9 or 10 marginal setae. Pereopod 

 7 between 60 and 70 percent as long as body in larger specimens, 

 slightly longer than pereopod 6 and 30 to 40 percent longer than 

 pereopod 5. Bases of pereopods 5-7 subtriangular, broader proxi- 

 mally than distally; distoposterior lobes poorly developed. Bases 

 of pereopods 6 and 7 only about 1/3 as long as combined lengths of 

 corresponding segments 3-6. Dactyls of pereopods 6 and 7 about 

 20 to 25 percent as long as corresponding propods; dactyl of pereopod 

 5 a little longer than corresponding propod proportionately. Coxal 

 gills on 7th pereopod and sternal gills on 1st pleonite absent in both 

 sexes. 



Abdominal side plates: posterior margins slightly convex to nearly 

 straight, with 4 to 6 setae each; posterior corners distinct, blimt to 



