SUBTERRANEAN AMPHIPOD STYGONECTES 45 



Gnathopod 2 : propod palmar margin relatively straight, armed with 

 a double row of 6 or 7 small spiiie teeth; posterior angle with 1 large 

 spine on outside and 1 or 2 small spines on inside; posterior margin 

 with 3 sets of setae; lateral setae few in number, mostly doubly 

 inserted; coxal plate about as broad as long, with 9 marginal setae. 

 Coxal plate of pereopod 3 about as long as broad at base, narrowing 

 distally, with 5 setae and 3 spinules marginally. Coxal plate of 

 pereopod 4 about as long as broad, extending about 1/2 the length 

 of segment 2, marginally with 10 or 11 setae. Pereopod 7 about 

 equal in length to pereopod 6, 15 to 20 percent longer than pereopod 

 5. Bases of pereopods 5-7 with rather well-developed distoposterior 

 lobes. Dactyls of pereopods 5-7 approximately 40 percent as long 

 as corresponding propods. Coxal gills on pereopod 7 absent in both 

 sexes; sternal gills present on 1st pleonite of female, absent in male; 

 all other gills present. 



Abdominal side plates: posterior margins broadly convex, with 7 

 to 10 rather long setae each; posterior corners distinct, bluntly 

 rounded; ventral margin of plate 1 with 3 spmes, margins of 2 and 

 3 with 4 spines. Pleopod 1, inner ramus, about equal in length to 

 pedimcle. Uropod 1 with up to 37 spines; outer ramus a little 

 shorter than inner ramus, about 70 percent as long as peduncle. 

 Uropod 2 with up to 24 spines; outer ramus nearly equal in length 

 to peduncle, about 2/3 the length of inner ramus. Uropod 3, ramus 

 about 1/4 as long as peduncle, armed apically with 4 spines. Telson 

 a little longer than broad, apex convex and armed with about 17 or 

 18 mostly long, unequal spines. 



Type locality. — Court Street Cave, Greenbrier Co., W. Va. 

 The type locality is a small, stream-passage cave developed in Missis- 

 sippian limestone and situated just north of Lewisburg, W. Va. 

 The tyY)e series was collected from under gravels in a small stream 

 about 100 feet from the entraace. 



Distribution and ecology. — This species is known only from 

 two caves in Greenbrier Co., W. Va., the two sites being separated 

 by a distance of about 16 miles. S. spinatus occurs syntopically with 

 S. emarginatus in both Court Street Cave and Fox Cave as pomted 

 out previously. Of the 46 specimens of this species collected to date, 

 only two have been males. Two ovigerous females, averaging 5.50 

 mm in length, were noted in the August 1939 collection from Court 

 Street Cave. One female had two eggs, the other had three eggs. 



Figure 9. — Stygonedes spinatus, new species. Female (4.50 mm), Fox Cave, W. Va.: 

 a, coxal plate of pereopod 3; b-d, pereopods 4,5,7. Female holotype (6.00 mm). Court 

 Street Cave, W. Va.: e-g, uropods 1,2,3; h, telson; i, lower lip;;, abdominal side plates; 

 k,l, antennae 1,2; w,n, gnathopods 1,2. 



