MAMMOIDES (Me. mammillata] Bradfield 1935,p.36, Pennsylvanian, 
Oklahoma [= Aechminella Harlton by Kellett 1936, 
pe771, and by Agnew 1942,p.759]. 
MANAWA [M. tryphena] Hornibrook 1949,p.e470 [Punciidae by 
Hornibrook] Recent off New Zealand. 
MARATIA [M. mara] Kay 1940a,p.258 [Primitiidae-Bollinae by 
Kay; Drepanellidae-?Bolliinae by Henningsmoen 1953, 
pe233,268) Ordovician, Ontario. 
MARGINIA [M. sculpta] Polenova 1952,p.96 [Kloedenellidae-- 
Knoxinae by Polenova] Devonian, USSR. 
MASTIGOBOLBINA [M. typus] Ulrich and Bassler 1923a,p.3067 
[ Zygobolbidae-Kloedeninae by Bassler and Kellett 
1934, pehC&; Beyrichiidae-Zygobolbinae by Hennings- 
moen 1953,p.23@,269] Silurian, West Virginia. 
MAURYELLA (M. mammillata] Ulrich and Bassler 1923a,p.316 
[Kirkbyidae by U&B; Beyrichiacea of uncertain 
family by Henningsmoen 1953,p.274] Mississippian, 
Tennessec. 
MEGALOCYPRIS [Me princeps] Sars 1898,p.4 [Cypridae-Cyprinae 
by Miiller 1912,p.219] Recent, South Africa. 
MELANELLA [M. hemidiscus] Wade 1911,p.451 [not Melanella Bory 

1824,PQlyg.J= Vogdesella Baker 1924,p.187, new namej 
Ordovician, Wales. [= Jonesella Ulrich by Bassler 
and Kellett 1934,p.3)3. 
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