WINOOSKI MARBLE. 219 



sized pieces of tlie marble which contained the same fos- 

 sils in greater or less abundance. One of these pieces 

 was afterwards shown by Mr. Allis to ]Mr. Billings, the 

 paleontologist of the Canada Survey, who at once recog- 

 nized the fossils as a species of a genus, Saltcrella, 

 named by him in iS6i to include certain fossils from lime- 

 stone of the Potsdam group at Anse au Loup, North Shore 

 of the Straits of Belle Isle in Canada. In a note published 

 in the Ainerican yoiirnal of Science and Arts^ Vol. lit, 

 page 145, Third Series, !Mr. Billings mentions the fossils 

 of the Winooski marble and refers them to his speciev, 

 Salterella puIcJiella. His description of the fossil taken 

 from a brochure entitled '•'•Nezv Species of Lower Sihwi- 

 an Fossils" page iS, is as follows : "Elongate conical gen- 

 tly curved, six to eight lines in length and one line to one 

 and a half in width at the aperture. Surface ornamented 

 with small encircling striic just visible to the naked 

 eye." 



As in specimens from the Winooski marble from 

 Swanton and also in those from Mallet's Bay near Bur- 

 lington the SaltereUa is only to be seen distinctly after the 

 stone is sawn and so only in section, its appearance diflers 

 somewhat fiom that in the specimens from the Straits of 

 Belle Isle which furnished the description quoted above. 

 In section the fossil resembles a series of thimble-shaped 

 bodies placed one within the other, the first forming a 

 cup-like cavity in which the animal lived. It is believed 

 to have been an annelid, though Prof. Dana, Manna/ of 

 Geology page 187, seems to think it may have been a 

 pteropod mollusk. The fossils in the Winooski marble 

 are from .13 in. to .23 in. long and from .09 in. to 

 .12 in. broad at the aperture. 



As the fossils lie imbeded in the rock in all positions 

 we have in the cut slabs sections crossing the cylindrical 



