the Rules governing this case, see Moore, Weller, 
and Knight, 1942, and particularly their discus- 
sion of "Graphiadactyllis versus Graphiodactylus," 
pe256,257]. iZygobolbidae-Drepanellinae (sic) = 
Depranellinae, by Ulrich and Bassler 1923,p.293] 
Ordovician, Kentucky. 
DEPRANELLIDAE - a change in the spelling of Drepanellidae, 

Swartz 1936,p.e552, to correspond with the original 
spelling of its type genus Depranella. 
DEPRANELLINAE - a change in the spelling of Drepanellinae, 
Ulrich and Bassler 1923,p.308, to correspond with 
the original spelling of its type genus Depranella. 
DIAGONELLA Swartz 1945a,p.e1205, ["Drepanellidae"™ by Swartz] 
no genotype givene 
DIBOLBINA [D. cristata] Ulrich and Bassler 1923a,p.312 
[Beyrichiidae by RPassler and Kellett 1934,p.285; 
Beyrichiidae-B8eyrichiinae by Henningsmoen 1953, 
Pece/7,<50,270+' Silurian, Maryliand. 
DICRANELLA [D. bicornis] Ulrich 1894,p.664 (Beyrichiidae by 
Ulrich; Primitiidae-Primitiinae by Bassler and 
Kellett 1934,pe19,286; Primitiidae-Bolliinae by 
Kay 1940a,p.e260; Hollinidae-Ctenonotellinae by 
Schmidt 1941,p.e48; Tetradellidae-?Piretellinae by 
Henningsmoen 1953,p.219,267] Ordovician,Minnesota. 
61 
