l8 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 93 



DESCRIBED SPECIES REFERRED TO BOLASPIS 



Bolaspis labrosa (Walcott) 



Alokistocare ? labrosum Walcott (part), Smithsonian Misc. Coll., vol. 64, 

 no. 3, p. 184, pi. 25, fig. 5 only, 1916. (Not 5.7 = 5. neihartensis.) 



Several hundred cranidia permit the selection of specimens showing 

 all features. 



Description. — Glabella conical, with deeply impressed occipital fur- 

 row ; two and sometimes three pairs of sharply recurved glabellar fur- 

 rows are distinguishable on certain individuals ; neck ring drawn out 

 into a heavy and probably fairly long spine ; brim diamond-shaped, 

 separated from the fixed cheeks by rather heavy, deep furrows which 

 pass forward and outward from the glabella ; rim somewhat thick- 

 ened, highly arched in middle and nearly erect ; frontal furrow strong ; 

 preglabellar area triangular, rising into a high boss in the middle ; fixed 

 cheeks tumid, rising considerably higher than the glabella, the abrupt 

 slope into the preglabellar area at times serving as an eye ridge ; eyes 

 small, situated about the middle of the cranidium, and usually stalked. 



The surface is granulose ; the granules are fairly large and scattered, 

 and are most numerous on the glabella. 



At present the free cheeks and pygidia are not located. 



Middle Cambrian, Meagher; (loc. 5f) ii miles south of Neihart. 

 Montana. 



Lectotype and plesiotype. — U.S.N.M. no. 61575. 



Bolaspis neihartensis, n. sp. 



Alokistocare ? labrosum Walcott (part), Smithsonian Misc. Coll., vol. 64, 

 no. 3, p. 184, pi. 25, fig. sa only, 1916. 



Among the cotypes of B. labrosa is a much shorter and more com- 

 pact form, to which the name B. neihartensis is given. 



Comparisons. — Compared with B. labrosa, the brim is reduced in 

 width, with the consequent loss of the prominent boss. Furthermore, 

 the dorsal furrows are more shallow and the fixed cheeks less ele- 

 vated, SO that the whole cranidium is rather evenly convex in cross- 

 section. Finally, the surface of the new species appears to be smooth. 



Occurrence same as preceding. 



Holotype and paratype. — U.S.N.M. no. 61576. 



Bolaspis haynesi (Walcott) 



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

 p. 179, pi. 24, fig. 46 (upper figure only), 1916. (Not 4, 4a ^ B. errata.) 



Three species were illustrated as B. haynesi, which fact vitiates this 

 as an example of a variable form, and it is necessary to restrict the 



