E0Z00N CANADENSE AT COTE ST. PIEREE. 69 



laminae become thin-walled, though often very regular ; and after 

 about 100 laminae at most, the superficial portions become acer- 

 vuline for an inch or so and then terminate. In some speci- 

 mens only a few regular laminae are formed, succeeded by acervu- 

 line structures. A very fine and regular specimen in my collection 

 has 100 laminae in a thickness of 3±- inches, giving a little more 

 than a thirtieth of an inch for the average height of each lamina of 

 sarcode and shell- wall. 



In order to test the state of preservation of the canal system and 

 nummuline layer, I treated a great number of specimens from diffe- 

 rent parts of the bed with a dilute acid. The result was, that in all 

 the canal system could be detected in greater or less perfection in 

 the thicker laminae near the base of the forms, and in some through 

 a great number of the laminae. The structure of the nummuline 

 layer was not so constantly preserved, its tubuli not being infiltrated 

 in some parts, so that it appears as a structureless band, or fails 

 altogether to be visible. In no instance could it be seen to pass 

 into chrysotile, as recently affirmed by Messrs. Rowney and King*, 

 although chrysotile veins often run very near to or across the walls. 

 The nummuline layer is almost always distinctly limited by parallel 

 surfaces, with its tubes at right angles, or nearly so, to these. The 

 sort of chevron arrangement figured by Rowney and King in fig. 7 

 of their plate, in the number of the 'Annals of Natural History ' for 

 October 1874, 1 have never observed ; and Mr. Weston, who has pre- 

 pared and examined microscopically hundreds of specimens oiEozoon, 

 was struck with the inaccuracy of the representations in this plate, 

 and remarked on it the first time that I met him after he had seen 

 the paper referred to. Pigs. 2 and 3, PL X., relate to these points, and 

 show the actual nature of the nummuline wall and its relation to 

 the intermediate skeleton and chrysotile veins, as do also the figures 

 recently published by Dr. Carpenter in his paper in the ' Annals' f. 



By careful scrutiny of the beds we were enabled to detect two 

 new forms of Eozoon, which may eventually prove to be distinct 

 species, but which for the present may be regarded as varietal 

 forms. 



One of these, found in situ by Mr. Weston, is flat in form and 

 very finely laminated, with thin walls except near the lower part, 

 where there is some supplemental skeleton with finer and more 

 curved canals than usual. The thin walls or laminae of the ordi- 

 nary skeleton are connected by very frequent vertical pillars or par- 

 titions, and are as numerous as thirty in half an inch, while the 

 whole thickness of the specimen does not exceed an inch. It thus 

 very closely resembles some of the Devonian and Silurian Stromato- 

 porce, especially when seen on the weathered surface. It may be 

 named in the mean time variety minor. 



The second occurs in more or less oval patches a few inches in 

 diameter, limited by a sort of frame or border of compact serpen- 

 tine, and presenting under the microscope an aggregation of small 

 acervuline chamberlets, having the proper wall filled with unusually 



* Ann. & Mag. of Nat. Hist. May 1874. t Ibid, June ]874. 



