50 CATALOGUE FAMILY UXION1IXE. 



t Unio siibovatus, Say. 



(Trans. Am. Phil. Soc., Vol. IV, PI. XVIII, Fig-. 4(j.) 



This form was described from the Ohio river, whence it ranges' west to the 

 Mississippi an/1 north to the Rideau Canal, Ottawa. Canada. See under U. occi- 

 dens. Lea. 



* Unio subrostratiiSy Say. [If 



(Figured as U. toptkaensis, U. nasJiviHensis, and U. rutersvillcnsis. which see.) 



The occnrence of this species in Kansas was originally reported, in the publi- 

 cation below referred to in Bull. No. II, under the name of U. topckacnsis, Lea, 

 It is without doubt that species, but it is equally certain that it has been recog- 

 nized elsewhere under at least four other names. Some time since, in collecting 

 the material for a careful study of certain groups of TJnioncs, questions of 

 synonymy presented themselves on every hand. The group to which this form 

 belonged was in a most unsatisf actor y condition and one of its elements was 

 wanting. The collections submitted for study by the Washburn College Survey 

 have supplied some of the missing data and a review of all the material, the 

 comparison of descriptions and plates and the certainty attaching to authentic 

 specimens have led to the following conclusions: 



The shell was first described as Unio subroxtrntus by Thomas Savin 1831. 

 Three years subsequently Mr. Lea obtained specimens from near Nashville. Ten- 

 nessee, in the Cumberland river, and described them specifically as U. naxh- 

 rille'iixi* (originally U. nashvillifuuis.) The species is figured in Trans. Am. 

 Phil. Soc. Vol. V, PI. XIY, Fig. 43, and appears to have been a male of U. sub- 

 rostratiis. Say. Mr. T. A. Conratl, in Vol. I, Jour. Acad. Nat. Sci. 1850, des- 

 ribed, from the " lower Mississippi " this same species as U. mississipplenste. 

 Later, in 1852, Mr. Lea again described specimens sent to him from Alexandria. 

 Louisiana, under the name of U. nigerrimus^ and figured it in Trans. Am. Phil. 

 Soc., 2nd Series, Vol. X, PI. XVII I, Fig. 23. Again, in 1850, he obtained 

 other representatives from near Rutersville, Texas, and described and figured it 

 as 77. rwtcrsvillensls, in Jour. Acad. Nat. Sci. Phi la. 2nd Series, Vol. IV, PI. 

 LX, Fig. 181. Once again did this widely distributed form occur in collections 

 submitted from Kansas, and was re-described and figured in the Jour. Acad. Nat. 

 Sci. Phila., 2nd Series. Vol. VI. PI. XLIX*, Fig. 12li, as U. tnjwlxicnsiis. Three 



LI] The remarks herein presented concerning this form were originally, plinted in a 

 vaper by the author, which appeared in the Bulletin <>f tlie Waslilnirn Collcyc Labora- 

 tory of Natural History, No. Ill, March, 1SS5. It is moperto add here, that the major 

 portion of the references to distribution in Kansas was rendered possible by the 

 collections made under the auspices of the Biolryic Survey <>!' Kansas, conducted by 

 that institution. 



CATALOGUE 42. 



