PLEISTOCENE FOSSILS. 



217 



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

 but possibly different forms have inadvertently been included under 

 one name. 



Fossils— Plate III. 



f^ 



& 



Tethea Logani.—(a) Mass of radiating si)iciiles in clay ; (h) Spicules ; (c, d) Portions 

 of spicules enlai'ged. OpMoglypha Sarsii. 



Tethea ? 



Another silicious sponge is indicated by little groups of small 

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

 and at Rivi^re-du-Loup by the author. Its spicules are long and acerate, 

 and much more slender than those of Tethea Lotjani. 



