l8 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 95 



Middle Cambrian, Exsulans ; Borregaard, Bornholm, Denmark, and 

 Skane, Sweden. 



Holotype. — Danmarks G. U. 



Bailiella heberti (Munier-Chalmas and Bergeron) 



Conocoryphe heberti Munier-Chalmas and Bergeron, Ann. Sci. Geol., vol. 22, 

 p. 334, pl- 3, figs. 3, 4, 1889. 



Middle Cambrian ; Montagne Noir. Herault, France, and localities 

 in Spain. 



Holotype.- — -Presumably at the Univ. Paris. 



Bailiella pseudooculata (Miquel) 



Conocoryphe heberti pseudooculata Miquel, Bull. Geol. Soc. France, 4th ser., 

 vol. 5, p. 474. pl- I5> fig- 6, 1905. 



Middle Cambrian ; Coulouma, Herault, France. 

 Holotype. — Presumably at Montpellier. 



Bailiella levyi (Munier-Chalmas and Bergeron) 



Conocoryphe levyi Munier-Chalmas and Bergeron, Ann. Sci. Geol., vol. 22, 

 P- 335, pl- 3, fig- I, 1889. 



Occurrence same as B. heberti. 



Holotype. — Presumably at the Univ. Paris. 



BAILIASPIS, n.gen. 



Several species that have been referred to Conocoryphe or Cteno- 

 cephalus differ in sufficient degree to warrant separate generic desig- 

 nation. These forms are nearest to Bailiella, being separated by the 

 thickening, backward projection, and sometimes upturning of the rim 

 in the middle of the cephalon, for which reason the name Bailiaspis 

 is proposed. 



Diagnosis. — All features normal for the family. Cephalon and 

 pygidium like Bailiella except for the rim of cephalon. Rim thickened 

 and extended backward in the middle, sufficiently in some species to 

 connect the anterior furrow with the dorsal furrow. 



Some species were referred to Ctenocephalus because the thickened 

 rim simulates a median boss, but examination of the specimens shows 

 at once that the structure is quite different. 



Genotype. — Conocephalites elegans Hartt. 



Range. — Same as for Bailiella. 



Bailiaspis elegans (Hartt) 



Conocephalites elegans Hartt, in Dawson, Acadian Geol., 2d ed., p. 650, 1868. 

 Conocoryphe elegans Matthew, Trans. Roy. Soc. Canada, vol. 2, sec. 4, p. 115, 

 pl. I, figs. 28-33, 1885. 



