5 V 



NEW YORK STATE MUSEUM 



It is closely allied on the one hand to D. prist is His. 



and D. foliaceus var. i n c i - 

 sus and on the other to the 

 remaining varieties of D . foli- 

 aceus, differing from all of 

 them, however, in size and the 

 number of thecae in a given 

 space. 



Loc. Stockport, Columbia 

 co., N. Y. ; ]/ 2 mile above Little 

 Mechin river, lower Canada ; 

 Glenkiln beds of S. Scotland 

 (common), Upper Llandeilo 

 beds, Middleton, Shropshire 

 (frequent ). 



We have found this variety 

 to be most common in the shale 

 from Mt Moreno, where D . foli- 

 aceus var. i n c i s u s is rare, 

 while the present variety com- 

 pletely covers some layers. 

 Some of the specimens are infil- 

 trated with pyrite and preserved 

 in full relief [see text fig. 292]. 

 No synrhabdosomes have been 

 observed ; the rhabdosomes are 

 markedly smaller and narrower 

 than in the preceding variety 

 and the thecae so much more 

 closelv arranged that the differ- 



r 293 ' * 



ence is easilv noticeable to the 



Fig. 288-93 D i plograp t n s f oil aceus yar. J 



acinus Lapwnrth. Fis. 28S Lapworth's original , . ™,, ., • <■ 



(manuscript) drawing " of Stockport specimen naked CN'C. 1 lie Vll'gella IS I I'e- 



(x f> : / 2 ). Fig. 289-93 Different aspects of speci- ' 



mens'mostly due to different direction of compres- / - 11 ,„, ir 1,. ,,-,,, ^k nrr>1rtnrrp>rl Tllf 



sion. Fig. 292 A partially infiltrated specimen. qilClltlN 111UU1 piOlOllgtU. 1 IK 



All enlarged x s . 



nemacaulus is broad and strap- 

 like and in one case [see pi. 25, fig. 2] undoubtedly inflated and showing its 

 central virsfula. 



