57 



Svi-cint'd ralnmflenitiK Calkins. Calumet Marshes, Chicago. 

 " jjeorinixtii Wolf. I'eoria. 

 illii(i)lxinxiii Wolf. Canton. 

 J'nli/tjf/rii niii/ti/iitftflti aUfontjtfinm.^is Nasoii. Algonquin. 



Of the above list the following are now considered syno- 

 nyms of other species: 



Unio iqisoni = Lam]>iiitiii lii/ami'ntina Lamarck. 

 CTOuiohaatA groitrenorii = ftoniohasia nfmiraviiKita Sav. 

 Plii/Kii elongata = Ajile.ra hi/piiiutim Linnc. 

 1, 1/11111:1(1 fi'rrixfiii — Li^mmrn aipi'nitii Say. 



" suiflaliif: — Lyiiuurd /jalwilrix Mi'iller. 

 Ximilen aiisoni = Vertigo omla Say. 

 Sitrri}u'ti ('(rliimfim>n,'< = Surcini'd rtfnsa Lea. 



Illinois lies wholly within Binney's Interior Kejfion of the 

 Eastern Province. Of the 69 species mentioned by Binney as 

 inhaltitiny this region, all Init 8 have l^een found in Illinois. It 

 will thus be seen that the Illinois moUuscan fauna is typical 

 of the interior region. Among the land shells the families 

 Zonitiihr and Heliciihf are represented by the largest numlier 

 of species; among the genera, P>ili/(/i/r(( is the most noteworthy. 



The Mississippi Valley is the metropolis of the pearly fresh- 

 water mussels [ri/ionldd'), and the position of the .state, l)or- 

 dered on the west by the Mississippi River and on the south and 

 east by the Ohio and Wabash rivers, has produced a large and 

 varied Uiiin fauna, no less than 98 species and varieties being 

 found in the various rivers and lakes. The SjilKtriida-. I'iri- 

 jKtridit', Ain/nc()/i(/(i\ (111(1 L//iiiiiifi(/(i' are also notal)ly developed. 



The Huviatile species are distributed among 9 families and 

 47 genera. Of these, 2 families and 25 genera are liivalves, 3 

 families and 7 genera are pnlmoniferous, and 4 families and 15 

 genera are branchiferous and operculate. as is evident from the 

 following list. 



FI.rVIATlI.E MOI.I.rsKS. 



„ ., ,. No. of No. of 



Fa™'l>'- •■''""^- Species. Varieties. 



Unittniflii Tfiini'iUn ti 1 



Lain}ifil\!' 24 



Micromya 1 



(thiu-ariu 4 



(^ 



