DENDROID GRAPTOLITES OF HAMILTON, ONTARIO. 



63 



ward- inserted on the stipe 1 to 2 cm. apart. At point of origin tliero is usually 

 a depression of considerable length on the side opposite to their place of attach- 

 ment and an expansion on the same side. There is a strong medial depression, 

 0.5 mm. wide (marking a central axis?), extending through the stipe, which is 



1.5 mm. broad. 



The specimens obtained are not entire. The 

 branches are often widely separated, and are some- 

 times long and tiexuous, extending for several centi- 

 meters in length. It sometimes happens that we 

 obtain a long stipe which may be either a portion of 

 the structure below the branches or a portion of 

 a separate branch. 



Doctor Gurley further remarks : 



Fig. 87. — Tha.m.nooraptus 



BARTOXEXSIS SrEXCER. 



Copied fuoji SrEXCER. 



Altogether there are 9 specimens which I refer to 

 this species. They vary considerably and tend to 

 arrange themselves in two series, and at different 

 stages in my work I have rated them as separate 

 species and as separate varieties. The latter is still 

 the course I should prefer, if I could with any con- 

 fidence correlate the two series in any definite way « 

 with Spencer's species. But as I can not do so satis- 

 factorily, they are simply characterized as well as 



possible and the task of connecting or separating them must remain to be 

 worked ont in the light of more complete specimens. I might, however, add 

 that though there is no certainty in the matter I rather incline to believe these 

 two series to represent widely separate fragments of the same polypary. 



Scries A. 



Polypary (?) consisting of long, more or less straight, or flexuous stems, 

 125-'>5 mm which for long distances are simple and destitute of branches. 

 In the five specimens (on three slabs) plainly referable to this series, only two 



branches are seen. These branches are 



\89 V about 1 mm. wide, and diverge from the 

 ^* V ) main stem at about 60° or a little less. 



2 / Texture brown-black, carbonaceous, exactly 



' ' similar to that of InocauUs pVumulosa in 



the same beds. 



Series R. 



Main stems and branches much narrower 



than in series A (stem ad maximum, 1.5 mm., 



wide ; branches mostly 0.5-O.S mm. wide) ; 



to diverge at a right angle or a little less. 



-i. 



Fics. 88, 89.— Thamxograptus ear- 



TONENSIS SPEXCER. TwO FB.^O- 

 MENTS BELONGIXG TO SERIES B. 



usually 0.8, occasionally 0.6 mm. 

 branches more numerous, tending 

 Texture the same as in series A. 



The specimens referred to series A belong to the Spencer collection 

 and are not accessible at present. Those of series B are represented 

 in text figures 88 and 89. 



IE both with all of Spencer's species, or either with any definite part 

 thereof. I might perhaps a.ld that a correlation of Series A with Spencer's 

 fig 1, and of Series B with his fig. 5, seems somewhat plausible.— R. R. Gurley. 



