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. 



Tethea Logani.(n) Mass of radiating spicules in clay ; (b) Spicules ; (c, d) Portions 

 of spicules enlarged. Ophioglypha 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 Riviere-du-Loup by the author. Its spicules are long and acerate, 

 and much more slender than those of Tethea Logani. 



