Leperditiidae-Aparchitinae by Jones in Chapman 
1901,p.147; Primitiidae by Bassler and Kellett 
1934,pe438, and by Henningsmoen 1953,p.266, 
267] Ordovician, British Isles. Several hundred 
specific names have been applied to this genus. 
PRIMITIELLA [P. constricta] Ulrich 1894,p.647 [Beyrichiidae 
by Ulrich; Primitiidae-Primitiinae by Bassler and 
Kellett 1934,pe17; Eurychilinidae-?Euprimitiinae 
by Henningsmoen 1953,p.229,268] Ordovician, 
Kentucky. 
PRIMITIIDAE Ulrich and Bassler 1923a,pe297, a family of 
Beyrichiacea, to include Primitiella, Haploprimitia, 
Primitia, Laccoprimitia, Euprimitia, Halliella, 
Primitiopsis, Ulrichia, Bollia, Placentula, Jonesella, 
Dicranella, Bolbibollia, Aechmina, Paraechmina, 
Acronotella, Dilobella, Bursulella, with the sub- 
family Eurychilininae, to include Eurychilina, 
Coelochilina, Chilobolbina, Apatochilina, Apatobol- 

bina. 
PRIMITIIDAE of Swartz 1936,p.549, reduced to include 
Primitia, Primitiella, Haploprimitia, Laccorprimitia, 
buprimitia, Halliella, Hallatia, Pyxiprimitia, 
?Milleratia, Jonesites, and Hippa. 
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