74 ROYAL SOCIETY OF CANADA 



This «jfC'cies is of about the size and form of JI. princeps, Bill., which 

 occ'urH aocording to Mr. Walcott in number 2 of the Manuel's Brook Sec- 

 tion (llie lower pari of the I'rotolenus Zone) and Billings's description of 

 the course of the growth-lines of that species agrees with those of ^. 

 Uatheicayi,^ but the dorsal lij) in H. princeps projects much more. 

 WakottH figures of Billings's species gives the same highly arched lip,* 

 but no indication whatever of the peculiar sinuate growth-lines and 

 apertural outline on the ventral side of ^. Hathewayi. 



Of the Swedish forms of Ilyolithcs described by G. Holm, the two 

 Ordoviciaii species, JI. concinnus, Holm, and H. innotatus Linrs.,^ come 

 nearest to our species, the former in the wide lateral areas of the ventral 

 side, the latter in its more uniform surface, liut in both the boundary 

 between the areas on the ventral side is a ridge, not a groove as in //. 

 Hathewayi. 



An operculum found with this species is so different from what one 

 would look for in this type of Hyolithoid shell, that I hesitate to ascribe 

 it to the species. Width on the two sides of the nucleus nearly equal. 

 Outline oval, diameters 10 and 12 mm. A groove interrupted in the 

 middle traverses the long diameter, a laised triangular area with the 

 apex at the nucleus traverses one side of the operculum, which is marked 

 by faint concentric stria?. 



This form of operculum occurs commonly with Orthotheca, but 

 Barrande figures one as found in the same bed with S. parens (Cam- 

 brian) ; this Bohemian species agrees with the Newfoundland form in the 

 low arching of the lip.^ 



A group of tubes of IT. Hathewayi has an arrangement on the layer 

 of shalo where it is found, that suggests a gregarious habit by the way 

 in which the apices of the tubes approximate to each other, and a 

 similar association of the tubes has been observed in Orthotheca.^ The 

 attitude of these tubes suggest that some Hyolithida^ were sedentary 

 animals with the point of the tube fixed in the mud of the sea-bottom. 



I have much pleasure in dedicating this interesting species to Mr. 

 W. Frank Hatheway, my companion during the trip to Newfoundland. 



' Can. Nat. new .ser., vol vi., p. 216, figs. 4 a and b of p. 213. 

 = Olcnellus Zone, pi. Ixxvi, figs. 1, e, /. and g. 



'Swedish Cambrian-Silurian Hyolithidae and Conulardiiae, pi. ii., figs. 12 to 16, 

 and flga. 24 to 28. 



* Système Silurien. Part i., vol. iii., pi. 10, fig . 14. 



* Tlie tubes of Volborthella described by me from the shale of Div. 1 b. (I'roto- 

 lenus Zone) of the St. John Group at Long Reach are clustered in the same way (bu^ 

 not connected). It appears to the author that Volbortliella (or at least the organisms 

 that he has ascribed to that genus) are small species of Orthotheca or at least are 

 closely allied to that genus ; tubicolous sea worms may have regular diaphragms, or 

 even perforate ones, that would easily in the fossil be mistaken for septa», such as 

 Orthocerafl possesses. 



