348 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 64 



the specimens for examination two years ago, and from notes made 

 before returning them I find that I considered the species to belong- 

 to the genus Bathyiiriscus. Mr. Reed thought that there were 12 

 or 13 thoracic segments. I (fould not make out more than eleven, 

 and the casts of the type specimens now before me do not appear to 

 have more than eleven. The back of the occipital segments shows in 

 the specimen from which his figure 7 is taken, and the last segment 

 referred to the thorax in his figure 8 seems to belong to the pygidium. 



The form of the cranidium, thoracic segments, and pygidium re- 

 late this species most nearly to B. rotundatus (pi. 47, fig. 2). 



Formation and locality. — Middle Cambrian : Valley of the Parahio, 

 Spiti, Kashmir, India. 



BATHYURISCUS, species undetermined (i) 



Plate 49, figs. 3, za 



A species of Bathyiiriscus not unlike B. atossa (pi. 48, fig. 2) 

 occurs in the Conasauga shales of Alabama. A distorted cranidium, 

 a free cheek, six thoracic segments and a fairly good pygidium occur 

 on fragments of the shale, but as they are not united and there is 

 only one specimen of each part, I do not think it worth while to base 

 a species on them. The pygidium has a length of 10 mm. with an 

 axial lobe 8 mm. in length ; the latter has four well-defined rings 

 that are extended across the pleural lobes as flattened bands separated 

 by narrow furrows ; there is also a trace of a shallow pleural furrow. 



Formation and locality. — Middle Cambrian: (i6e) Conasauga 

 formation; cut on East and West Railway, i mile (1.6 km.) south- 

 west of Piedmont, Calhoun County, Alabama. 



BATHYURISCUS ? species undetermined (2) 



Plate 6s, fig. 5 



A large species, related to Bathyuriscus adceus (pl^ 47, figs. 3, 3a) 

 by the form of the pygidium, has a single pair of sharp spines pro- 

 jecting from the antero-lateral angles; it has eight rings and a term- 

 inal section in the axial lobe ; the anchylosed segments are shown on 

 the pleural lobes as seven or eight shallow furrows separated by 

 narrow ridges ; a narrow strong border merges into the border spines 

 which extend obliquely backward. 



Formation and locality. — Middle Cambrian: (up) Marjum for- 

 mation ; hmestone of i^ of section, about 2,000 feet (609.6 m.) above 

 the Lower Cambrian and 1,010 feet (307 m.) below the Upper Cam- 



