DKS M01XKS ACADEMY <>F SCIENCE. 17 



f Manairilanu minor, J 



< 'I runs. MU. I'hiL S< <-.. :.'<! Series, v. 1. X. I':, viil. I';-. iT>.> 



This isti Temu-M-t -.j.rries, but is found also in North Alahainu in stream- 

 tributary to the Tennessee river. It irroups with Marg. calceohi Lea, which 



M c. 



I Jlargaritana inoiiufloiifa, Say. 



(Descriptions of the Shells (if North Atm-rica, 1M. VI as r/no mortodom/ 



This >iK>ri's \vas described from tlie Wabash river. It ranges from Ohio to 

 the Ilolston and Tennessee rivers, and west to the Mississippi, in Mercer county, 

 Illinois. It is not a common species, and appears to occur locally and not gen- 

 erally between the limits Ivere indicated. It is usually considered to be and dis- 

 tributed .as a Utiio, 



f Marii'arilaua qmidnita, Lea. 



(Jour. Phila. A ad. Nut. Sci.. ~M Series, Vo\ V, PI, XXXII, Fi;j-. 27i.) 



Credited only to east Tennessee. The form groups with 3//rrr;. ctilceolu. 

 which see. 



f Mai'j^aritaua ravcneliana, Lea, 



(Trans. Am. Phil. Soc., Vol. V, PI. XVII, Fig-. 50.) 



This form has been credited only to the French Broad and u Swananoe" riv- 

 ers. North Carolina. It appears to be rare and local. Its affinities are uncer 

 .tain, unless it be related closely to Marg. marginata, which is suspected, 

 though the only specimens seen were badly eroded and hence likely to mislead. 



* Margaritana rugosa, Barnes. 



(Am. Jour, of Sci. and Arts, 1st Series, Vol. VI, PI. XIII, Fi-s. 21, :.Mh.) 

 Flanges from Kideau ajid Ottawa rivers, Canada, to Eastern New York; to 

 Georgia and Alabama; to Neosho river, Kansas, and north to Wisconsin. Not- 

 withstanding so wide a range the species is very constant in all its characters. 

 It is usually a very abundant form, but west of the Mississippi much less so 

 than eastward. The specimens from north Alabama, (at Tuscumbia) are the 

 largest which have passed in review. 



rATALOGUK '.. 



