42 ROYAL SOCIETY OF CANADA 



Byronia annulata, n. sp. (PI. I., tig. 2.) 



A long flexuous chitinous tube, (sharply ?) curved at the proximal 

 end and terminating in a transverse circular aperture. It is marked by 

 sharply raised transverse annulations, that are more distantly placed in 

 the distal than the proximal part. In the larval part of the tube there 

 are about six to a millimetre ; at one-third of the length of the tube from 

 the proximal end they are twice as far apart ; at two-thirds from this 

 end, and from this to the oi'ifice, there arc about two annulations to a 

 millimetre. 



Sculpture. — The surface of the tube is minutely granulated, and is 

 marked between the annulations by closely set longitudinal rai.scd lines, 

 visible only with a lens. The interior of the tube is smooth, but has 

 furrows corresponding to the annuli and the longitudinal raised lines. 

 The sculpturing is more distinct on the interior than on the exterior of 

 the shell. 



Size. —Length of the most complete example (which, however, does 

 not show the oritice of the shell), 75 mm. Width, where the tube termi- 

 nates, 10 mm. 



This species is marked on its surface like .some examples of Tenta- 

 culites, Schloth. but that genus has a calcareous shell and is straight, and 

 the species also are mostly much smaller. Trachyderma, Phill., said to 

 resemble Serpulites, might be like this, but the tubes are said to be 

 membranaceous. 



OETHOTHECA, Novak. 



Orthothbca corrugata, n. sp. (PI. I., fig. 3.) 



This slender species is easily recognized by the strong longitudinal 

 ridges that traverse it ; there are about three of them on the ventral side. 

 It occurs rarely. 



HYOLITHES, Eichwald. 



Two species of this genus are present in the Mount Stephen Fauna. 



A species that seems similar to H. pennaiulus, Holm, but is about a 

 half larger, is not uncommon. Being flattened in shale we cannot be 

 sure of its identit}-, but like that species it has a strong rib along the 

 centre of the ventral side, with a weaker ridge dividing the area on each 

 side near the middle. 



Hyolithes carinatus, n. sp. (PI. I., figs. 5a and b.) 



The tube enlarges somewhat rapidly and has a moderately arched 

 lip on the dorsal side. The ventral side has a rather strong keel along 



