340 S YSTEMATIC PALEONTOLOGY 



Family SOLENOPLEURIDAE 



Genus HYSTRICURUS Raymond 



HYSTEICUEUS CONICUS (Billings) 



Plate XXXIII, Figs. 10-12 



Bathyurus conicus Billings, 1859, Canadian Nat. and Geol., vol. iv, p. 266, 



text fig. 12d. 

 Bathyurus conicus Whitfield, 1889, Bull. Amer. Mus. Nat. Hist., vol. ii, p. 61, 



pi. xiii, figs. 15-21. 

 Hystricurus conicus Raymond, 1913, Bull. Victoria Memorial Mus., 1, p. 60, 



pi. vii, fig. 9. 



Description. Glabella conical, rounded at the anterior and almost 

 straight across the occipital border ; no trace of glabellar furrows ; surface 

 marked by larger pustules, slightly more than their own diameter apart. 



Pygidium semicircular with the anterior margin not as sharply curved 

 as the posterior, which is bordered by a narrow, flattened rim. Surface 

 strongly trilobate, with the axial lobe extending to the posterior margin 

 where it is obtusely pointed. Axial lobe marked by five transverse, short, 

 sharply elevated rings, each of which is marked by a central spine-like 

 tubercle, and one or two lateral nodes. Lateral lobes with four rings 

 having two to four nodes on each. 



The Maryland specimens referred to this species consist of pygidia 

 having the same general outline and the sharply elevated rings orna- 

 mented with prominent nodes. The species has hitherto been found in 

 the Beekmantown limestone of Canada, Vermont and New York. 



Occurrence. BEEKMANTOWN LIMESTONE (Cryptozoon steeli zone). 

 Vicinity of Williamsport and Hagerstown, Maryland. 



Collection. TJ. S. National Museum. 



Family BATHYURIDAE Walcott 



Genus GONIURUS Raymond 



GONIURUS CAUDATUS (Billings) 



Plate XXXVI, Fig. 14 



Bathyurus caudatus Billings, 1865, Pal. Foss., vol. i, Geol. Surv. Canada, 



p. 261, fig. 245. 

 Goniurus caudatus Raymond, 1913, Bull. Victoria Memorial Mus., vol. i, 



p. 66. 



