REPORT OF THE STATE PALEONTOLOGIST 1902 1043 



Still another characteristic pedicle valve from the same horizon 

 has a width of 13 mm with a hight of 16 mm. but is very ventri- 

 cose, appearing proportionally higher. The plications are 

 almost invisible and the sinus narrow, very shallow and 

 rounded. 



This species is well represented in the upper Stromatopora 

 bed of the Manlius limestone in the city quarry at Becraft. Its 

 main distinguishing features are its subrhomboidal outline, 

 shallow, narrow and rounded sinus, and obsolete or faint, 

 broadly rounded plications. In the latter two features it differs 

 materially from S, eriensis Grabau. 



Measurements of two characteristic pedicle valves from this 

 bed give 



1 2 



width in mm 12 12 



hight in mm 9 10 



A comparison of typical S. coralliensis with the types 

 of S. modestus from Cumberland Md. shows a close rela- 

 tionship, the latter differing chiefly in its extremely shallow 7 

 sinus and faint fold, and in the total absence of plications. 

 Specimens similar in most respects to typical S. c o r a 1 1 i n - 

 e n s i s have been found in the Cumberland strata. 



Spirifer eriensis Grabau var. 



Geol. boc. Am. Bui. 1S99. 11:366, pi. 21, fig. 2a-b 

 A variety of this species is more common in the upper Stroma- 

 topora bed at Becraft than S. c o r a 1 1 i n e n s i s . It is char 



Fig. 7 Spi r i f er eriensis var. 



acterized by a deep angular sinus with straight sides which 

 diverge uniformly and regularly forward. It has narrow and 

 more widely separated plications than S. corallinensis, 

 and they become faint or obsolete in the upper part. A moder- 

 ately strong plication occurs on each side of the sinus and 



