/ 



98 Fossiliferous RocTcs in Nova Scotia. 



posed in my paper. Mr. Honeyman has also apparently extended 

 the Arisaig series downward by the discovery of fossils in the 

 slates of Doctor's Brook, in which I have often searched in vain 

 for such remains. I shall look with much interest for specimens 

 from this place. 



Among the fossils kindly sent to me with the paper, are some 

 throwing new light on species previously imperfectly known, and 

 others that are new to Nova Scotian Geology. The following 

 especially deserve notice. 



Fig. 1. mm ^^mm H. Dawsoni. 



1. Homcdonotus Dawsoni, — (Hall.) The caudal shield and 

 portions of the articulations of the body, were the only parts 

 known when the species was described by Prof. Hall. Mr. 

 Honeyman now sends nearly perfect specimens of the head. 

 It has the posterior border nearly straight, the glabella 

 moderately prominent and slightly wider behind than be- 

 fore. It descends abruptly in front, and the frontal margin, 

 which is absent in the specimen figured, appears to have risen 

 in front of the glabella and eyes, with equal abruptness. The eyes 

 are large and prominent, and advance into a line with the front 

 of the glabella. Some of Mr. Honeyman's specimens shew that 

 the species attained to a considerable size, at least three times 

 that indicated by the head now figured. (Fig. 1 above.) 



2. Phaco2)S StoJcesii, — (Edwards.) A cast of a head referable 

 to this species, for notice of which and the closely allied P' 

 Orestes, (Billings.) see Mr Billing's paper in Canad. Nat. vol. 5, 

 pp. 65 and 66. 



Of two other trilobites, fragments of which have been sent by 

 Mr. Honeyman, one is according to Mr. Billings, a Proetus, the other 

 a Dalmania, allied to D. socialis. 



3. OrtJwceras exornatum, N. s. This very prettily marked 

 species is circular in its cross section, moderately tapering and 

 straight, with siphuncle slightly eccentric, and septa half a line to 

 a line apart, in a specimen two to four lines in diameter. The 

 surface is slightly annulated and ornamented with about twenty- 

 four flat longitudinal flutings in the manner of a Doric column. 

 The whole surface is also delicately striated transversely. In 



