NO. 5 CAMBRIAN TRILOBITES RESSER 3 1 



Glossopleura bosworthensis, n. sp. 



Dolichomctopiis hoccar Walcott (part), Smithsonian Misc. Coll., vol. 64, no. 5, 

 p. 2,^Z> fig'- i^' only, 1916. (See preceding, G. hoccar.) 



Several cranidia and a hypostoma appear to constitute another 

 species. Compared with G. boccar, the glabella is even more nearly 

 rectangular, the eyes slightly longer and directed more outward. 



Occurrence same as G. hoccar. 



Holofypc.—U.S.'NM. no. 62704. 



Glossopleura nitida, n. sp. 



Dolichomctopiis hoccar Walcott (part), Smithsonian Misc. Coll., vol. 64, no. 5, 

 p. 363, pi. 52, figs, id and 1/ only, 1916. (See preceding, G. hoccar.) 



Cranidia of this species are much shorter than the others formerly 

 referred to G. hoccar. The hypostoma is placed with the illustrated 

 pygidium because its surface ornamentation is similar. 



Occurrence same as G. hoccar. 



Holotype. — U.S.N.M. no. 62708 ; paratype, no. 62706. 



Glossopleura stephenensis, n. sp. 



DolichometopHS hoccar Walcott (part), Smithsonian Misc. Coll., vol. 64, no. 5, 

 P- 363, pi. 52, fig. I only, igi6. (See preceding, G. hoccar.) 



Only this one impression representing the genus has been found 

 among the thousands of specimens collected from the Mount Stephen 

 fossil bed. Unfortunately, it is not well preserved. 



Comparisons. — Compared with D. hoccar, to which it had been re- 

 ferred, this species has a shorter glabella without glabellar furrows, 

 and the dorsal furrow is more curved, causing greater expansion of 

 the glabella at both ends. In the tail axial and pleural furrows are 

 practically absent. 



Middle Cambrian, Stephen ; (loc. 14s) Mount Stephen, near Field, 

 British Columbia. 



Holotypc.—V.S.N.M. no. 62702. 



Glossopleura producta (Hall and Whitfield) 



Ogyia producta Hall and Whitfield, U. S. Geol. Expl. 40th Parallel, vol. 4, 



p. 244, pi. 2, figs. 31-34, 1877. 

 Bathyuriscus productiis Walcott (part), U. S. Geol. Surv. Bull. 30, p. 217, 



pi. 30, fig. 1/ and composite from two localities, 11, 1886. (Not ir, 



id^zG. piochensis; i = G. parabola; la, ig, ih = Anoria ntahcnsis; 



ib=^G. iitahensis.) 

 Dolichometopus productiis Walcott (part), Smithsonian Misc. Coll., vol. 64, 



no- 5. P- 369, pi. 53, figs. 2-2e only (all copies of originals), 1916. 



Many species have been referred to this form. Every occur- 

 rence except unquestioned Ophir shale can be eliminated without 

 examination, 

 3 



