4 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 119 



Type-locality and range. — Otter Creek, Cumberland County, 

 Tenn., approximately 3.5 miles upstream from the Obed River on 

 the Cumberland Plateau. This species is known only from the type 

 locality where it was found associated with Dactylocythere brachystrix. 



Types. — The holotypic male and a dissected male paratype are 

 deposited in the U.S. National Museum (nos. 111253 and 111254). 

 Paratypes are in the collections of C. W. Hart, Jr., and the joint col- 

 lection of the authors. 



Host. — An undescribed species of the genus Camharus. 



Relationships. — Dactylocythere pachysphyrata is related to the same 

 group of species as is D. brachystrix. While they share a number of 

 features in common, the most conspicuous is the thickened "ankle" 

 of the clasping apparatus. It is less closely allied to D. steevesi (Hart 

 and Hobbs, 1961) in which the vertical ramus of the clasping apparatus 

 is more uniformly thickened. It may be distinguished from daph- 

 nioides by lacking a postero ventral extension of the shell; from 

 chalaza by possessing more than one tooth on the internal border of 

 the clasping apparatus; and from runki by possessing a much more 

 prominently thickened "ankle." 



Remarks. — The name pachysphyrata is derived from the Greek 

 ■waxvs, meaning thick, and (T<^vpop, meaning ankle, referring to the 

 thickened junction of the vertical and horizontal rami of the clasping 

 apparatus of the male. 



Genus Donnaldsoncy there Rioja, 1942 

 Donnaldsoncy there cayugaensis, new species 



Figures Ih-k 



Male. — Eye present. Shell (fig. H) with highest portion posterior 

 to midlength; dorsal margin tapering more gently anteriorly than 

 posteriorly, and ventral margin entire; submarginal setae somewhat 

 evenly, if widely, spaced around entire perimeter of shell. Range of 

 shell size of 10 specimens recorded in table 1. 



Copulatory complex (figs. Ij, k) with peniferum terminating distally 

 in a bilobed rounded prominence; anteroventral margin of posterior 

 lobe thickened. Dorsal and ventral fingers slender and almost straight 

 with terminal seta of dorsal finger reaching level of penis guides on 

 peniferum. Clasping apparatus with distal portion directed at about 

 a 45° angle to basal portion and not clearly divisible into vertical and 

 horizontal rami; margins entire except distal portion of internal border 

 with two teeth and distal extremity with four denticles. 



Female, — Shell of triunguis female (fig. Ih) much higher than that 

 of male and higher posteriorly than anteriorly; ventral margin with a 



