162 TRILOBITBS OF GIRVAN. 



Family Olenidji. 

 Genus REMOPLEURIDES, Portlock. 

 Remopleurides (Teratorhynchus) bicornis, Reed. 



1903. Remopleurides (Teratorhynchus) bicornis, Reed, supra, p. 33, pi. v, figs. 5 — 16. 



The upper and major recurved spine in this species was not described as laterally 

 grooved in the previous diagnosis of its characters. A good cast of the anterior 

 portion of a head-shield from the typical locality, Dow Hill, is now available, which 

 shows a lateral longitudinal median narrow groove running along each side of the 

 spine from its base to nearly its tip. 



Family Asaphidj;. 

 Genus ASAPHUS, Brongniart. 

 Asaphus (Isotelus) instabilis, Reed. Plate XX, fig. 4. 



1903. Asaphus (Isotelus) instabilis, Reed, supra, p. 46, pi. vii, figs. 2 — 8. 



There is an excellent detached free cheek of A. instabilis from Dow Hill in the 

 new material which Mrs. Gray has collected, and it shows the characteristic 

 features better than the one figured previously (PI. VII, fig. (>). The angle 

 between the two branches of the facial suture, the distance of the eye from the 

 posterior margin of the head-shield, the distance of the point of section of the 

 margin by the posterior branch of the facial suture from the genal angle, the 

 almost rectangular inclination of the lateral and posterior margins of the free 

 cheek to each other at the genal angle, the shallow lateral marginal furrow, 

 the absence of a broad neck-furrow, and the sharp, abruptly originating spine at 

 the genal angle, are features which are well exhibited in the specimen before us. 



Genus CYCLOPYGE, Corda. 



Cyclopyge rediviva (Barrande) ?. 



I '.'ei.. Cyclopyge rediviva, l»< <■ 1. supra, p. 52, pi. viii, figs. 2, 3. 



There are some isolated and imperfect thoracic rings of a species of Cyclopyge 

 from Wliitehonse Bay which have been recently found by Mrs. Gray. They 



