106 ROYAL SOCIETY OF CANADA 



rKoriiK('4. 



(Grenus defined in preceding ai-ticle on Mount Stephen Fauna). 

 Urothbca. pervetus (PI. v., tig. 8). 



Urotheca j)rrretus, Xat. Hist. Soc. N.B., Hull, xviii., p. 11)1, pi. i., fip:. 8. 



Proximal end unknown ; distal end exhibits a slender, gently curved 

 chitinous tube. All the examples are pressed flat in the shale and so the 

 form of the orifice is not seen. 



Sculpture. — No transverse striae were ob.served ; but faint longitud- 

 inal stria' are present, these may be due to compression. 



Size. — Length of the part preserved, 35 mm. ; width at the small 

 end, 1^ mm. ; at the aperture, 3^ mm. Rate of tapering of this part of 

 the tube J to 17. 



Horizon and Locality. — Gray shales below the Upper Etcheminian 

 limestone on Smith Sound, Nfld. Scarce. 



In Swedi.sh Cambrian beds at an horizon which may be considered 

 equivalent to the Protolenus Zone on this side of the Atkintic occurs a 

 small species of tube shell, which was at first referred to Hyolithes and 

 subsequently by Gr. Holm established with one other species as a ncAv 

 family ' under the names ïorellella and Toreliellidic, and which some 

 might think congeneric with the form above described. But Holm claims 

 that it has been clearly established by Dr. II. Santesson, of the Swedish 

 Geological Surve}', that the tubes of Torellella is of a phospbatic nature, 

 for Santesson found (JG per cent" of calcium phosphate in examples of 

 this shell from a hard sandstone from Haverholm in Finland. T. lœviijata, 

 the species in question has been found at many localities in Sweden and 

 Finland, and although the rocks at a number of these places has been 

 described as phosphatiferous (and although we have excellent examples 

 of Hyolithellus micans quite phosphatized in the sandstone of Division lb 

 of the St. John Group, from which we might suppose that this was a 

 phosphatic tube originally) yet we cannot but think that the phosphatic 

 nature of the shell of Torellella has been established by Dr. Holm on good 

 authority. This being the case it becomes impossible to refer the species 

 we have just described to Torellella. It is equally impossible to refer it 

 to Orthotheca because we have calcareous organisms in the same layers 

 with Urotheca pervetus, while its tubes are evidently chitinous ; hence it 

 falls most naturally into the genus Urotheca. 



Torellella is described as having in all cases a flat-oval shape to its 

 tube, the species above cited has only been found in a flattened condition, 

 so the transverse section of the tube is unknown. 



' Swedish Cambrian— Silurian Hyolitbidœ and Conulariida', Stockholm, 1893, p» 

 14(M47. 



'■' Dr. Santesson found (Hi'l!) calciuni phosphate. 



