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the side of the adult, and gradually attain their full size. Surface with 

 fine transverse striae of different sizes, usually five or six in one line, 

 crossed by obscure septal striae. 



The inner wall is excessively thin, and in some individuals appears to be 

 absent altogether ; but in many it is distinctly visible. The size of the 

 inner area varies, as it does in all species of this genus, but in general it 

 is one-third the width of the corallite. 



Locality and Fomation. — Becsie River Bay, Anticosti ; in Division 2, 

 Anticosti group, Middle Silurian. 



Collector. — J. Richardson. 



Cyathophyllum interruptum. (N. sp.) 



Description. — Corallum apparently simple, turbinate, curved, gradually 

 expanding to a width of 1^ inches in a length of 5 inches; irregularly 

 anniilated by sudden constrictions and expansions of growth, from f to 1^ 

 inches apart. The transverse section, where the diameter is 1^ inches, 

 shows about 120 radiating septa, which seem to reach half-way to the cen- 

 tre. On the outside, where the surface is a little worn, the septal striae 

 are well indicated, and the interseptal spaces divided into square compart- 

 ments by the transverse diaphragms. There are about 3 septal striae in 

 1 line. The cup appears to be about | of an inch deep, and at the bottom 

 about I the whole diameter of the fossil. The internal structure in the 

 longitudinal section cannot be made out in the specimens observed, being 

 obscured by crystallization. 



This species somewhat resembles O. truncatum (Linnaeus), but is more 

 deeply annulated. The rings on the upper side project at about a right 

 angle from the side, sometimes ^ an inch, and gradually slope on the lower 

 side to the narrowest part of the next constriction below, so that the indi- 

 vidual is constructed as if several corallites had been set into each other. 



Locality/ and Formation. — L'anse a le Barbe, Bay of Chaleurs, Middle 

 Silurian. 



Collector. — Sir W. E. Logan. 



Cyathophyllum Anticostiense. (N. sp.) 



Description. — Corallum rather large, cylindro-turbinate, slightly curved 

 at the base. Cup irregularly conical, its depth about half the diameter of 

 the corallite ; the Avails thick ; the margin effuse or obtusely rounded, the 

 inner surface of the cup descending with a convex slope from the outer 

 edge inwards. In the longitudinal section the inner area is about one-third 



