SUBTERRANEAN AlVIPHIPOD STYGONECTES 119 



longer than pereopod 5. Bases of pereopods 5-7 narrowing distally; 

 distoposterior lobes poorly developed, almost absent in pereopod 7. 

 Dactyls of pereopods 5-7 approximately 1/4 as long as corresponding 

 propods. 



Abdominal side plates: posterior margins nearly straight in 1 and 2, 

 slightly convex in 3; posterior corners distinct, blunt; ventral margins 

 of plates 2 and 3 with 2 or 3 spines each. Pleopod 1, inner ramus 40 

 to 45 percent longer than peduncle. Uropod 1 : outer ramus about 70 

 percent as long as inner ramus, about 50 percent as long as peduncle, 

 armed with 8 spines; inner ramus with 13 spines; peduncle with 14 

 spines. Uropod 2: outer ramus about 80 percent as long as inner 

 ramus, 70 to 75 percent as long as peduncle, armed with 9 spines; 

 inner ramus with 11 spines; peduncle with 9 spines. Uropod 3, 

 ramus about 50 percent as long as peduncle, armed apically with 5 

 spines. Telson rather long, about 45 percent longer than broad, 

 gently narrowing distally; subtruncate apex armed with 13 long 

 spines. 



Type locality. — Comal Springs in Landa Park, New Braunfels, 

 Comal Co., Tex. This spring is developed in Edwards limestone 

 (Cretaceous) and situated at the eastern edge of the Balcones escarp- 

 ment. Resiu-gence gives exit to water that flows into the nearby 

 Guadalupe River. The first specimen (1 of 2) was taken from a 

 crevice near the spring exit a few days after a heavy rain. The second 

 specimen was collected the following year just inside of the "cave- 

 like" spring opening under a rock. 



Distribution and ecology. — This species is known only from its 

 type locality but may be expected elsewhere in subterranean waters 

 in the vicinity of New Braunfels, Tex. Brood plates on the holotype 

 female appeared to be nearly mature in regard to size but lacked 

 marginal setae, although marginal serrations were present. 



Remarks. — It is a pleasure to name this rare species after Mr. 

 Stewart B. Peck, who collected the first known specimen and who 

 has materially assisted in the collection of other subterranean 

 amphipods during the past several years. 



Stygonectes dejectus, new species 



Figure 29 



Stygonectes flagellatus (Benedict). — Hutaricht, 1943, p. 705 (in part). 

 Stygonectes species. — Reddell, 1965, p. 160 (in part). — Holsinger, 1966, p. 119 (in 

 part) . 



Material examined 



TEXAS. — Kendall Co.: Cascade Caverns, female holotype and female paratype, 

 L. Hubricht and J. Mackin, May 15, 1940 (USNM). (Holotype partially on slide 

 mount.) 



