440 Canadian Record of Science. 
tubercles, without any fine threa ds connecting the former, or of 
tubercles only, arranged in trans verse rows. 
4. Cancellatx, Sculpture a lattice work of transverse coarse main 
ribs, always plainly and sharply bent at obtuse angles; also finer 
and lower small ribs connecting th e former. 
The forms are further classified under these general heads by 
more minute variations of sculpture, as in the case of the Hyo- 
lithidee, so that the whole scheme forms an excellent key to the 
identification of species. 
About sixteen pages of the work are devoted to the description 
of the Swedish species of Silurian (Upper and Lower) Conulariidee. 
TORELLELLID®. 
Gen. Torellella Holm. 
Under this heading is described two small slender organisms 
which Dr. Holm separates from Hyolithes, chiefly because the shell 
is composed of calcium phosphate (66 per cent.) He regards them 
as probably allied to the worms, One is from the Lower Cambrian 
the other from the Lower Silurian, and as regards the former he 
expresses surprise that no related species has been found in the 
Lower Cambrian of North America. It has been collected from 
the Lower Cambrian of Norway, Sweden, Finland and Denmark. 
He suggests that Hyolithes elongatus Barr. and Coleoprion bohemi- 
cum Barr. and C. Sandbergeri Barr. may belong to this genus. 
Dr. Holm’s work is illustrated by six excellent plates showing in 
detail the characters of all the species treated of in his memoir, 
which is one of the series of works published by the Geological 
Survey of Sweden, and one of the most meritorious, in that it in- 
troduces order into the chaos of species heretofore passing under 
the name Hyolithes, Theca, &c. 
G. F. MATTHEW. 
