DIHOGMOCHILINA [Isochilina grandis var. latimarginata Jones 
1891,p.78,pl1.10,f.1l-4) Teichert 1937a, p.153; 
[Leperditiidae-Isochilininae by Swartz 1949,p.325] 
Silurian, Canada. 
DIHOGMOCHILUS Neave, 1950,vol.5,p.-7h, error for Dihogmo- 
chilina Teichert 1937a. 
DILOBELLA [D. typa] Ulrich 1894, p.672, [Beyrichiidae by 
Ulrich; Primitiidae-Primitiinae by Bassler and 
Kellett 1934,p.20; Primitiidae-Dilobellinae by 
Kay 1940a,p.2; Tetradellidae by Swartz 1936, 
pe551; ?Hollinidae-Tetradellinae by Schmidt 1941, 
pe373 Tetradellidae-Tetradellinae by Henningsmoen 
1953,p.266; Ordovician of Minnesota. 
DILOBELLINAE Kay 1940a,p.256, a subfamily of Primitiidae to 
include Dilobella and Ceratopsis. Henningsmoen 
1953,p-197,266 has included this subfamily in the 
Tetradellinae of Swartz. 
DISCOIDELLA {D. simplex} Croneis and Gale 1939,p.276 
{Kirkbyidae by C&G; Beyrichiacea of uncertain 
family by Henningsmoen 1953,p.273] Mississippian 
of Illinois. 
DITHYROCARIS Scouler, considered by Jones 1850b,p.6h to 
belong to the Phyllopoda, and who reported 
Dithyrocaris permiana, and D. glypta n.esp., from 
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