SUBTERRANEAN AMPHIPOD STYGONECTES 113 



long as peduncle, armed with about 10 spines; inner ramus with about 

 12 spines; peduncle with 11 or 12 spines. Uropod 2: outer ramus 

 about 80 percent as long as inner ramus, 65 to 70 percent as long as 

 peduncle, armed with 6 spines; inner ramus with 12 spines; peduncle 

 with 5 spines. Uropod 3, outer ramus about 1/3 the length of peduncle 

 and armed apically with 2 spines. Telson not much broader proxi- 

 mally than distally, 65 to 70 percent longer than broad; convex apex 

 armed with about 20 unequal spines. 



Type locality. — A seep at girl scout camp, 3.2 miles south of 

 Locust Grove, Mayes Co., Okla. The type locality is located in 

 Mississippian rock of the Boone formation and situated near the 

 southeastern periphery of the Ozark Plateau region (specifically in 

 the Springfield Plateau). The type series of 16 specimens was col- 

 lected along with five females of ^S. ozarkensis. 



Distribution and ecology. — This species is known only on the 

 basis of females and only from the type locality in the western Ozarks. 

 Although most of the larger females examined had well-developed 

 brood plates, only a single specimen (6.00 mm long) was ovigerous 

 and contained one newly hatched juvenile in the brood pouch. 



Remarks. — It is a real pleasure to name this species after Dr. 

 Thomas E. Bowman, Associate Curator of Crustacea at the United 

 States National Museum, who has been of great assistance to me in 

 the study of the Amphipoda. 



Stygonectes species 



As a result of the present investigation, material from Neel Cave, 

 Menard, Co., Tex. (a single male collected by W. Russell, Aug. 30, 

 1964) can no longer be regarded conspecific ^^'ith S. reddelli (see 

 remarks under S. redelli elsewhere this paper and also Holsinger, 1966). 

 The structure of the gnathopods, pereopod bases, abdominal side 

 plates, and telson of this specimen indicate an alliance with the 

 tenuis group, however, and further study will probably show that it is 

 most closely related to S. russelli. Although this material is considered 

 specifically distinct, its description as a new species Anil best await 

 collection of additional material. 



FLAGELLATUS GrOUp 



Diagnosis.— Adult size range up to 14.00 mm. Females larger 

 than males in species where both sexes are knowTi. Lower lip, inner 



Figure 27. — Stygonectes bowmani, new species. Female (6.75 mm), seep, 3.2 miles S. of 

 Locust Grove, Okla.: a, coxal plate of pereopod 3; b-e, pereopods 4,5,6,7; /, pereopod 7 

 of another 6.75 mm female; g,h, gnathopods 1,2; t, telson; ;, uropod 3; k,l, antennae 1,2; 

 m, abdominal side plates; n,o, uropods 1,2. 



