290 bulletin: museum of comparative zoology. 



also found in the same formation near White Gate and Tilsons Gap, 

 Bland Co., and in the Holston near McDonalds Mills in the Cata«/ba 

 Valley, north of Salem, Va., in all of which localities it was collected 

 by Dr. E. W. Shuler; and also in the Holston at the McNutt quarry, 

 Sharon Springs, Va. A single large pygidium collected by the writer 

 in the Athens near Saltville, Va., is probably of this same species. 

 In the lower part of the Athens near Bull's Gap, Tenn., the species 

 is quite common. Holotype M. C. Z. 1,600. 



Homotelus laeviurus, sp. nov. 



This species has a short broad cranidium, of little convexity, on 

 which the glabella is entirely merged into the general surface, and 

 dorsal and glabellar furrows quite absent. The median pustule is 

 small but prominent on the otherwise smooth surface, and the shell 

 seems devoid of puncta. The free cheeks and thorax are unknown. 



The pygidium is evenly convex and the only marking is a very 

 slight swelling indicating the position of the posterior end of the axial 

 lobe. Even in internal casts the outline of the axial lobe shows only 

 vaguely. 



Measurements: — A cranidium is 17 mm. long and 24 mm. wide at the tips 

 of the fixed cheeks. At the widest point in front of the eyes it is 16 mm. wide. 

 Another cranidium is 11.5 mm. long, 16 mm. wide at the tips of the fixed cheeks, 

 and 9.5 mm. wide at the palpebral lobes. A pygidium is 14 mm. long and 

 19 mm. wide. 



This species is more nearly allied to Homotelvs simplex Raymond 

 and Narraway than to any other described species, but has smoother 

 shields, and the pygidium in particular shows less trace of the axial 

 lobe. The absence of puncta in the shell separate it from H. ohtusus, 

 the only other species with which it could be confused. 



Horizon and Locality: — x\ very common trilobite in the Kimms- 

 wick limestone at Mincke, Mo., where it was collected by Dr. D. C. 

 Barton. Cotypes M. C. Z. 1,584, 1,585. 



Homotelus catactus, sp. nov. 



The only representative of this genus so far found on Newfoundland 

 is a single cranidium which does not seem referable to any of the 

 described species. 



