PLKISTOCKXK FOSSILS. 



21 



According to Mr. Lainbe, this species is a tetractinellid sponge ; 

 but possibly ditterent forms have inadvertently been included under 

 one name. 



Fossils — Plate III. 







Ttlhca Lci(jnni.—(ii) Mass of railiating .siiioiiles in clay ; (h) Spiuules ; (c, </) rortidiis 

 nt siiicuk's ciiImgiMl. OiihioijUjjihn Sarsii. 



Tethea ? 



Another silicious sponge is indicated by little groups of small 

 spicules found at the Tanneries, near Montreal, by Mr. (I. T. Kennedy, 

 and at Riviere-du-Loup by the author. Its spicules are long and acerate, 

 and much more slender than those of Ttlhai Loijaui. 



