NO. 5 CAMBRIAN TRILOBITES — RESSER I9 



name to one of them. Furthermore, among the new collections there 

 are at least four additional species. 



The upper of the figures on the slab shown in figure 4b agrees most 

 closely with the description and becomes the lectotype oi B. haynesi. 

 This specimen evidently carried a large occipital spine and not simply 

 a thickened neck ring as in the picture. 



Middle Cambrian, Meagher ; (loc. 20k) Pole Creek, Madison Range, 

 Montana. 



Lectotype. — Cast U.S.N.M. no. 61503 (one specimen). (Original 

 in Mus, Comp. Zool.) 



Bolaspis raymondi, n. sp. 

 Acrocephalitcs haynesi Walcott (part), Smithsonian Misc. Coll., vol. 64, no. 3, 

 p. 179, pi. 24, fig. 4b (lower specimen), 1916. 



This species differs from B. haynesi in being less granulose ; wider 

 across the fixed cheek, particularly at the anterior angles ; and in 

 possessing a stronger boss. 



Occurrence same as B. haynesi. 



Holotvpe. — Cast U.S.N.M. no. 61562. (Original in Mus. Comp. 

 Zool.) 



Boiaspis errata, n. sp. 



Acrocephalitcs haynesi Walcott (part), Smithsonian Misc. Coll., vol. 64, no. 3, 

 p. 179, pi. 24, figs. 4, 4a, 1916. 



B. errata has almost completely lost the median boss, so that the con- 

 sequently narrower preglabellar area gives it an aspect different from 

 more typical forms of the genus. 



Occurrence same as B. haynesi. 



Holotype. — Cast U.S.N.M. no. 61562. (Original in Mus. Comp. 

 Zool.) 



Bolaspis ticida (Walcott) 



Alokistocare ticida Walcott, Smithsonian Misc. Coll., vol. 64, no. 3, p. 187, 

 pi. 26, figs. 6, 6a, 191 6. 



Until better preserved material becomes available, we can tenta- 

 tively refer this species to Bolaspis. 



Middle Cambrian, Bloomington ; (loc. 55s) Blacksmith Fork, 15 

 miles east of Hyrum, Utah. 



Cotypes. — U.S.N.M. nos. 61589, 61590. 



CEDARIA Walcott, 1924 



Cedaria minor (Walcott) 



Asaphiscus minor Walcott, Smithsonian Misc. Coll., vol. 64, no. 5, p. 388, 

 pi. 61, figs. 3-3^, 1916. 



