398 Canadian Record of Science. 
REFERENCE TO FIGURES. 
Figs. 1-4 Steliella Billingsi. 
Fig. 1. Showing the form of the sponge and traces of the vertical 
ridges between the canal apertures. 
Fig. 2. A transverse section from the centre of the same specimen 
showing the arrangement (in section) of the large canals. 
Natural size. 
Fig. 3. The outer surface of another specimen showing the canal 
apertures. Natural size. 
Fig, 4. A portion of the spicular mesh, as seen in a thin micro- 
scopic section. Enlarged sixty diametres. 
Figs. 5-6. Steliella crassa. 
Fig. 5. The sponge, natural size. 
Fig. 6. A fragment of the spicular mesh, enlarged sixty diameters. 
ON THE ACADIAN AND St. LAWRENCE WATER-SHED. 
By L. W. Barney. 
Read before the Nat. Hist. Society of New Brunswick, April, 1889. 
The tract of land which constitutes the great divide 
between the basin of the St. Lawrence on the one hand, and 
shore of the upper St. John and Baie Chaleur on the other, 
is one of much interest for several reasons. Geographically 
it corresponds very nearly to the line separating the 
Provinces of New Brunswick and Quebec; politically, it has 
had great significance in connection with the various inter- 
national and inter-provincial boundary disputes, as it still 
marks in a general way the line of separation between 
races of different language, customs and descent ; physically, 
its character is such that, until a comparatively recent 
period, it has acted as a very serious barrier to inter-pro- 
vincial communication ; and finally, from a geological point 
of view, it is of interest as forming a portion of one of the 
great cordilleras of the continent, the eastern extremity of 
the great Appalachian mountain-system. It is proposed in 
the present paper, to give a brief summary of some of its 
characteristics, as viewed in the last two aspects, 
