578 ORTMANN—NAYADES OF 
and Holston R.) ; sparus (Swamp Cr., Whitfield Co., Ga.), and I am 
fully convinced that all these actually are synonyms of nebulosus. 
But I believe that there are many others, and on account of the ex- 
traordinary size of the list of synonyms, I think it advisable to make 
a few remarks as to these. 
U. creperus Lea, ’38 (Tennessee), made a synonym of L. iris 
(Lea) by Simpson (p. 115), is founded upon an old half shell, 
hardly recognizable, but it may be this. In the Walker collection is 
a specimen from Clinch R., Va. (Wright), labeled creperus, which 
is distinctly E. nebulosa, It is a male, has purple nacre, and distinct, 
rather broad, only slightly interrupted rays. 
U. dispansus Lea, ’71 (east Tennessee), has been put by Simpson 
(p. 106) in the synonymy of L. vanuxemensis; 1 think it belongs 
eres 
U. puniceus Haldeman, ’42 (Simpson, p. 104) (Holston R., 
Washington Co., Va.). I have found forms corresponding to the 
description in the same region (topotypes), and they simply are E. 
nebulosa with a peculiar reddish-orange nacre. 
U. obscura Lea, ’38 (Nashville, Tenn.), and U. zeiglerianus Lea, 
°38 (Cumberland R., Tenn.), made synonyms by Simpson (p. 117) 
are also this, with rather fine, uninterrupted rays, and purple nacre. 
U. fatuus Lea, ’40 (Holston R., Tenn.), and U. dactylus Lea, ’40 
(Caney Fork R., Tenn.), made synonyms by Simpson (pp. 116, 117), 
are rather elongated and unusually swollen forms of E. nebulosa, 
with the rays less developed, and not interrupted. 
U. planicostatus Lea, ’60 (Tuscumbia, Ala.) (Simpson, p. 117). 
A strongly compressed male, with rays distinct, rather wide, and little 
interrupted. Such specimens are frequent, chiefly in the Clinch. 
U. muehlfeldianus Lea, °38 (Cumberland R., Tenn.) (Simpson, 
p. 121). According to Simpson, only a single specimen is known, 
which is undoubtedly this, probably a female. Pilsbry & Rhoads 
give this also from Watauga R., near Johnson City, Washington Co., 
Tenn.: near this place (Watauga, Carter Co.), I have found E. 
nebulosa. 
U. amenus Lea, ’40 (Holston R., Tenn.) (Simpson, p. 122). A 
typical female of E. nebulosa. 
U. tener Lea, ’40 (Big Pigeon R., Tenn.) and U. regularis Lea, 
