Cv1- THE PALEONTOLOGY OF MINNESOTA. 
The total number of species and varieties in the Lower Silurian, belonging to the 
classes studied, which have been discussed in the volume, is eight hundred and eighty-one, 
and of these six hundred and ninety-three have been identified in the state, and ninety 
have been obtained from other states, and are likely to be found in Minnesota, They are 
distributed as follows: 
Sponges. 11 species, of which one only has been found in Canada. 
Graptolites. 3 species, all of which have been found in New York and Canada. 
Corals. 10 species, of which 4 have been found in New York and Canada. 
Bryozoans. 162 species, of which 15 are in New York and Canada, and 17 have not been 
found in Minnesota. The 19 large genera, i. ¢., those containing four or more species are 
the following: 
Stomalopords.ncnwsems se eicr eeu 4 species. Montreulipora-aranvrererae a tees 5 species. 
EURUMIGICbY are wa. os vieloeienie sissies 9 species. Atactoporellay. secs ccrsteo asters lcreee 4 species. 
PachyGictyary. © sav. cieiecieclecteiare 7 species. Homotrypella...-cmecsenstiece 6 species. 
ISCHATOpONal) 7-22 seers cele 4 species. FL OMODLYP Bis socio svecefal letter lees 8 species. 
Stictoporella cercccec: ecieiene 6 species. IPFASOPOLB shih smraisiecsiremac eer 8 species. 
HGlOpOTa meth cet coer ease oe aeek 7 species. Mesotry pane. scstwtieectcsaees 5 species. 
Ar bHTOCTeMIay . < <i2 (1s <s0sle sie seciee 5 species. Calloporaiaa-csarcnctesismioss erie 9 species. 
INEMALOPOTA. sci eiioerac cei ele 4 species. Ba tOshONi aie 1 cect ene etre 8 species. 
PhyMOpOrina), «:.:5 assisc eyerare tee ele 4 species. MOnO bry Day \ienteces acs oreaes mee 4 species. 
MLE PLOLLY Daas nacre seleteiere wieroccteiersve 4 species. 
Of this total 9 species have not yet been found in Minnesota, leaving 102 species in 19 
genera, which are known to occur within the state. The other 30 genera, of which one 
(Heterotrypa) does not occur in the state so far as known, contain 51 species. 
Brachiopods. 81 species, of which 20 species (and 2 varieties) occur in New York, and 
33 species (and 4 varieties) occur in Canada. There is a total of 40 species common to 
Minnesota, New York and Canada. Of the 81 species considered, 8 are not found in the 
state, making a total of 73 species of known Lower Silurian brachiopods. The large 
genera, having each four or more species, are: 
Tin oa aie issaycteve ace eters fetes Sie oe 12 species. Strophomenas.).2 2: lee ctex telecine 12 species. 
OLrthis ess aces erra eee eee 17 species. 
Of these 3 are not found in Minnesota, leaving 38 species in 8 genera. The other 24 
genera contain 40 species. Two of these (Schizambon and Rhynchonella) have not been 
found in the state. 
Lamellibranchs. 131 species, of which 18 are not found in Minnesota, 7 are in New 
York (and Penn.), and 5 in Canada. Nine species are common to Minnesota, New York 
and Canada. 
The large genera, 7. e., those containing 4 or more species, are the following: 
SATO DODY CHIVAS oi cterevels ete cierelel 8 shecele 4 species. Cyrtodontawkn (erase scicectlasisiniee 16 species. 
Ohionyehiariamtees scteste ciety tletelele/e 5 species. WVanuxemia. «scene. poem veel 15 species. 
ING UTOLOPSIS* eee ote ntesisteiistesiersts 11 species. Witold ayy cei dajententsisiee ercleiatarcyoletes 12 species. 
Orthodesmiascice.)-leiscite ewer" 4 species. Chenod ONbaiee. ccc coe a anelcleivins 26 species. 
IINGOGESMa re. cass wife ae eels ove 5 species. Technophorus........ 2.0..-.-- 4 species. 
Of these 15 are not found in Minnesota, leaving 87 species of Minnesota lamellibranchs 
in 10 genera. The total number of genera is 27. The other 17 genera contain 29 species. 
