Grier: Morphological Features of Mussel-shells. 169 



Table IV. — Continued. 



Pleurohema ohliquum coccineum. Comparison Upper Ohio Drainage 



WITH Lake Erie. 



PD 



AD 

 L ■ 



PHL 



AHL 



TH 



D VD' 



Presque Isle, Lake Erie, elc. 



(101-119) 



Allegheny tributaries (4, 16, 



18,35) 



Presque Isle (101-119) 



Beaver Drainage (79, 62-78) . . 



Presque Isle (101-119) 



Allegheny tributaries (22-34) • ■ 



Presque Isle (101-119) 



Beaver River (79) 



Presque Isle (102-119) 



French Creek (22-34) 



.871 I .1284 



•591 



.822 

 .871 

 •873 

 .871 



•1755 



• 583 

 •591 

 •60s 

 •591 

 •546 



.1146 



•1359 

 .1146 



.1264 



.12J 

 .8372 .1627 

 .871 I .1284! .591 

 .823 I .1811! .46S 

 .871 i .1284, .591 

 .84S7 •1540I ^547 



• 1850 



.2008 

 .1850 

 .2422I .1060 

 .i8so; .1146 

 .1873' .1271 

 .i8so .1146 

 .1708 .1379 

 .i8so .1146 

 .1934 .1350 



Comparison Elliptio dilatatus sterkii, Lake Erie Drainage. 



Lake Erie, La Plaisance Bay 

 Presque Isle Bay 



•3159 

 •315 



•525 

 •494 



.826 

 .806 



.1674' .576 

 .188 : .s6o 



•1504 

 •1333 



,I22S 

 ,1071 



Elliptio dilatatus. Comparison Upper Ohio Drainage with Lake Erie. 



La Plaisance Bay (98) 



Presque Isle (101-120) 



Presque Isle (101-120) 



Allegheny tributaries (22-34) 



Presque Isle (101-120) 



Beaver Drainage (60-79) ■• ■ ■ 



Presque Isle (101-120) 



Allegheny River (5-20) 



Presque Isle (101-120) 



Beaver River (79) 



6 

 6 

 31 

 31 

 31 

 31 

 31 

 31 

 14 

 14 



.1225 

 .1071 



•I02S 

 .1128 

 .1025 

 ■0993 

 •I02S 

 .1156 

 .1320 

 .1461 



Comparison Symphynota costata eriganensis. Lake Erie Drainage. 



Lake Erie, Monroe County, 



Mich 



Presque Isle Bay 



.0876 



•08S3 



Symphynota costata, Comparison Upper Ohio Drainage with Lake Erie. 



Presque Isle (99-120) 1 15 



Allegheny tributaries (22-34) • •' I5 

 Presque Isle, Lake Erie (loi- 



120) I 18 



Beaver Drainage (6o-8s) ' 18 



•363 

 ••275 



•336 

 .276 



•584 

 •583 



•550 

 •552 



.809 

 .768 



•757 

 .727 



• 257 

 .231 



.242 

 .270 



•584 



•535 

 .476 



•234 

 .2227 



.2128 

 .2101 



.0890 

 .0901 



.0920 



Comparison A nodonta grandis footiana. Lake Erie Drainage. 



Lake Erie, La Plaissance Bay . . 



Lake Erie, Cedar Point 



Lake Erie, Presque Isle Bay. . . 



Maumee River, Roche LeBoeuf 



Rapids, Miami & Erie Canal 



•0713 



.0418 

 .1039 



.0765 



