82 ROYAL SOCIETY OF CANADA 



posterior sharply indented ; these furrows are equally spaced, and the 

 space from the third furrow to the front of the glabella is equal to the 

 space between two of the furrows ; in the middle of this space a fourth 

 furrow is indicated by a slight emargination of the glabella in front of 

 the ocular Hllet. 



The occi])ital ring is lenticular in form with ii tubercle on the axial 

 line, and the liirrow divitiing it from the glabella is deep and extends all 

 across. 



The fixed cheeks are triangular, ami the sigmoid intra-ocular groove 

 extends half way to the ))Osterior margin, where it terminates at the 

 dorsal suture, it cuts otf an antci'ior quarter of the fixed cheek ; the eye- 

 lobe is quite short and is opposite the anterior groove of the glabella. 



The posterior marginal fold is straight but curves forward at the 

 extremity, and the furrow is sharply cut. 



The extension of the dorsal suture behind the eye is longer than the 

 eye-lobe and the anterior extension of the suture combined. 



Sculpture. — As the fossil is a cast of the test, the surface markings 

 are not preserved. 



Size. — Length of the head-shield, 8 mm. ; width of the middle piece 

 of the head, at the anterior end of the dorsal suture and at the eye-lobe, 

 9 mm. ; at the posterior end of the suture, 14 mm. 



Horizon and locality. — As the ])receding. 



There are many features in this head-shield that recall the OlenidaB 

 of the Upper Cambrian. 



This species is near A. manueletisis, Wale, but dillers in the course of 

 the anterior marginal furrow, and in the position of the glabellar furrows. 

 In Walcott's species the glabella is divided into four nearly equal lobes, 

 in this species the anterior lobe is twice as wide as the others. Walcott 

 describes his species as having long eye-lobes like Anopolinus, in this 

 species the eye-lobes are short. 



Having studied this species of Avalonia, 1 am now of the opinion 

 that the species of the Protolenus Fauna in New Brunswick assigned to 

 Avalonia should be referred to subgen. Bergeronia of Protolenus as being 

 near B. articephala. 



PROTOLENUS. 



Protolenus Howleyi, Wale. sp. ? ' 



Solenopleura (?) Howleyi, Walcott ? Olenellus Zone, p. 657, pi. xcvii., fig. 7 and 7a. 



In the shaly layers associated with the fii-st limestone conglomerate, 

 near Foster's Point, one meets occasionally with a Protolenus which 

 appears to be closely related to the form which .Mr. Walcott has described 



' The printer of the Olenellus Fauna has made a mistake in the reference of the 

 platr .\eii. and ha.s placed the name " Harveyi " where Howleyi ought to be, this 

 appears from the description of the species in the text. 



