Of the Vicinity of Montreal. 421 



*Serpula vermicularis, Lin. (Fig. 28.) A small specimen, 

 Montreal, supposed by Dr. Gould to be this species. 



RADIATA. 



Echinus g/anulatus, Say. Found at Beaupovt by Sir C. Lyell. 

 (Lamin.) 



'Ophiura. — In a nodule from Green's Creek in C. G. S., are 

 the remains of an organism which appears to have been a star 

 fish of the family Ophiuridae. 



^Tethea, Lamarck, (Fig. 16.) Silicious spicula, referable to 

 sponges of this genus, abound at Logan's farm, Montreal, and as 

 I am informed at other places in the tertiary clays, though they 

 have hitherto been supposed to be of mineral origin. They occur 

 in radiating flattened masses, just as they have existed in the 

 living sponges, some of which must have attained a diameter of 

 nearly three inches. They have either grown on the clay or at- 

 tached to dead shells. The long cuticular spicula are fVths of 

 an inch in leng-th, slightly curved, pointed at both ends, and with 

 a large internal cavity, which appears in the large as well as in 

 the small specimens. Under a high power the points appear 

 slightly truncated and open. The shorter internal spicula ar-e 

 about yV^li of an inch in length. Mr. Bowerbank of London, 

 who has kindly examined these curious fossils, has no doubt that 

 they belong to the genus Tethea ; but does not refer them to any 

 species. The spicula resemble the simple ones of T. Cranium, as 

 figured by Johnston ; but our fossils do not afi'ord any that are 

 tricuspidate. In the mean time, therefore, until this species can 

 be identified with any previously described, I may claim for it, as 

 one of the most curious fossils of these deposits, the name of T. 

 Logani, in honour of the head of the Canadian Geological Survey, 

 who has kindly placed at my disposal for this paper many of the 

 materials he had collected for the description of these tertiary 

 -deposits, to which the pressure of more important departments of 

 hi^work has hitherto prevented him from devoting much of his 

 attention. 



Mr. Bowerbank informs me that the recent species of Tethea 

 range from low water mark to 200 fathoms. 



* Foraminifera. — The calcareous shells of several species of these 

 minute creatures, occur with the sponges above mentioned. My 

 means of reference do not permit me to refer them with any cer- 



