NO. 9 NEW CAMBRIAN TRILOBITE FAUNULE — RASETTI 21 



extended into about 12 pairs of minute spines. Length of largest 

 pygidium 8 mm. 



Occurrence. — Collection cs-4, North Chatham. 



ry/)^^.— Holotype : U.S.N.M. 146001. Paratypes: U.S N M 

 146002. 



BOLBOPARIA CANADENSIS Rasetti, new species 

 Plate 5, figures 13, 14 



Available material. — A single, well-preserved cephalon. 



Description. — Cephalon relatively broad and short as in B. superba. 

 Glabella somewhat longer in proportion to the cranidium, long and 

 narrow, subcorneal, pointed in front. Three pairs of lateral furrows 

 impressed, the posteriormost pair deep, short, pit-like, the other two 

 similar but increasingly shallow. The glabellar spine is broken off, 

 but its base shows that it was large and equally located as in B. 

 superba. Occipital furrow straight, of even width throughout ; occip- 

 ital ring short and simple. Outline of the cheeks of the same general 

 type as in 5. superba, but differing in several details. The posterior 

 portion, from the axial furrow to the widest point of the cheeks, is 

 almost straight, since there is hardly any change of direction between 

 the posterior border furrow and the posterior portion of the lateral 

 furrow. Where these furrows meet, there is the usual deep furrow 

 directed toward the cephalic margin ; but in the present species this 

 furrow extends also inward and forward, forming a broad, shallow 

 depression across the cheek reaching the axial furrow at the level 

 of the middle pair of glabellar furrows. At the widest point, the 

 cheek outline forms a narrowly rounded angle, continues straight 

 forward and somewhat inward to the anterolateral corners where 

 the cheek attains its highest elevation, and then curves to a transverse 

 inward course as in B. superba. As a whole the cheeks acquire thereby 

 a peculiar subhexagonal outline. The border furrow and border are 

 much like the other species, except that there is only one, large 

 tubercle at the posterior end of the lateral border. The small lateral 

 border spines are in the same position as in B. superba. Ornamenta- 

 tion identical with the other two species of the genus. Length of 

 cephalon 4.5 mm, width 4.8 mm. 



Occurrence. — The single known specimen was collected by Mr. 

 Claude Hubert when mapping an area near the south shore of the St. 

 Lawrence River in Quebec. The collection, designated as 63-F24, is 

 stated to be made from a calcarenite bed a half mile north of Elgin 

 Station, LTslet County. The locality is about 60 miles northeast of 



