22 Natural History Bulletin. 



sinus." He further adds: "From this similarity I had at one 

 time supposed the S^irifer marioncnsis to be found among the 

 BurHngton fossils." Prof. Hall evidently intended to refer to 

 some other species than Spirifcra -parryana^ probably to 

 vS. hiplicata which occurs in the Kinderhook beds at Burling- 

 ton. kS. paj'ryana has no plications, dichotomizing or other- 

 wise, on the mesial fold and sinus, and further it is scarcely 

 possible that similarity to a Hamilton species, if such similar- 

 ity had actually existed, could lead one to suppose that Spiri- 

 fera marionensis would be found among the Burlington fossils. 



Spirifera capux, Hall, is cited as a distinct species and re- 

 ferred to the Kinderhook group in Miller's Palaeozoic Fossils, 

 page 129. 



Spirifera capax is retained as a specific designation for 

 sandstone casts of S. parryana in the report of the State 

 Geologist of New York for the year 1882. Two of the 

 figures originally employed in illustrating S. capax in Hall's 

 Geology of Iowa, are copied among generic illustrations of 

 the Spirifcridce on plate 52, and in the description of the plate 

 the species is said to come from the "lower carboniferous, 

 mouth of Pine Creek, Iowa." On the same plate figures 8 

 and 9, are good illustrations of a common phase of S. par- 

 ryana. The species is appropriately named in the description, 

 and referred to the "Hamilton group of Iowa." 



In the Palasontolog}' of the Eureka District, by C. D. 

 Walcott, page 137 Plate XIV, Fig. 10, we find a small spiri- 

 fer from Devonian limestone. Eureka District, Nevada, 

 described and illustrated under the name Spirifera parryana^ 

 Hall?. Walcott expresses some doubt as to the identity of the 

 specimen from Nevada, with Hall's species from Iowa. The 

 drawing represents a ventral valve with a moderately deep 

 sub-angular sinus which presents a strongly marked contrast 

 with the broad, shallow, evenly rounded sinus of typical forms 

 of S. parryana. More perfect specimens will undoubtedly 

 prove the Nevada form to be quite distinct from the species to 

 which it has been provisionally referred. 



