PRIMITIIDAE of Schmidt 19h1,p.25 divided into subfamilies 
Primitiinae, Eurychilinae, Primitiopsinae. 
PRIMITINAE Bassler and Kellett 1934,p.l6, a subfamily of 
Primitiidae to include: Primitiella, Haploprimitia, 
Primitia, Laccoprimitia, Euprimitia, Halliella, 
Primitiopsis, Ulrichia, Bollia, Jonesites, 
Jonesella, Dicranella, Bolbibollia, Aechmina, 
Paraechmina, Acronotella, Bilobella, Bursulella, 
Monoceratina, Mooreina. This subfamily is greatly 
reduced by Boucek 1936,p.41, and by Schmidt 1941, 
p25, and is felt unnecessary by Henningsmoen 
1953, who reduces the entire family Primitiidae to 
4 genera. 
PRIMITIOPSIDAE Swartz 1936,p.555, a family for the genus 
Primitiopsis. 
PRIMITIOPSINAE Hessland 1949,p.239, a subfamily of Primi- 
tiidae, for the genus Primitiopsis. 
?PRIMITIOPSIINAE Henningsmoen 1953,p.197, 230, 268, as a 
subfamily of Eurychilinidae, for the genus 
Primitiopsis. 
PRIMITIOPSIS [P. planifrons] Jones 1887, p.5 { Beyrichiidae 
by Ulrich 1894,p.632; Cytheridae by Jones, in 
Chapman 1901,p.147; Primitiidae-Primitiinae by 
Bassler and Kellett 1934,p.17; Primitiopsidae by 
154 
