£0 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 8l 



Unfortunately the specimen illustrated in plate 3, figure i fails to 

 preserve the rear portion of the thorax so that its features cannot 

 be determined. 



FAUNA OF THE UPPER SHALE 



Two species were found in the IMiddle Cambrian shale overlying 

 the nodular limestone. They lie side by side on one small piece of rock. 



DOLICHOMETOPUS ? LODENSIS (Clark) 



Plate 3, fig. 9 



Bathyuriscus howelli lodensis Clark, 1921, Univ. Calif. Pub!., Dep. Geo!., 

 Vol. 13, No. I, p. 6. 



The original description states simply that the thoracic segments 

 number eight and that the pleurae of the fifth are much longer than 

 the rest, particularly than the three succeeding ones. 



This species is referred to Dolichometopus in spite of the fact that 

 no other species now in the genus has the long fifth thoracic pleurae. 

 Except for this and the sharper pleural spines, this species agrees 

 quite closely with the adjacent specimen referred to D. productus. 



DOLICHOMETOPUS PRODUCTUS (Hall and Whitfield) 



Plate 3, fig. 9 



Ogygia producta Hall and Whitfield. 1887, U. S. Geol. Expl. 40th Parall., 



Vol. 4, p. 244, pi. 2, figs. 31-35. 

 Dolichometopus productus Walcott, 1916, Smithsonian Misc. Coll.. Vol. 64, 



No. 5, p. 369, pi. 53, figs. 2-4. 



This single incomplete specimen appears to be the same as the 

 common D. productus, a widespread IMiddle Cambrian species. 



