320 Systematic Paleontology— Middle Devonian 



are no entire examples. Some of these are very slightly curved while others 

 are entirely straight, and it is possible that the curvature may be due 

 to accident. From the specimens examined no satisfactory determina- 

 tion of the surface markings can Ije made." Hall, 1879. 



The Marjdand specimens are slender, gradually tapering and perfectly 

 smooth, with the exception perhaps of one suture near the larger end of 

 the specimen figured, the longer one with a length of 23 mm. The 

 specimen was sent to Dr. J. M. Clarke who has written as follows : 

 " With regard to the specimen called Coleolus aciculatus I might say that 

 for myself I do not know what Coleolus really is. So far as my observa- 

 tions of specimens of this object are concerned they seem to be forms of 

 Bactrites. Coleolus aciculum is certainly that, and I am inclined to 

 think that when Professor Hall described C. aciculatum he confused the 

 species with what he had previously described as 'Orthoceras acicula ' 

 from the Genesee shale. Miller, I observe, cites C. aciculatus from the 

 Marcellus and Portage; C. acicula from the Genesee. Now the type of 

 Coleolus is C. tenuicincius, in which I have never seen any septa, but 

 the species having the external aspect of this with full concentric orna- 

 ment, mostly prove to be Bactrites. As to the identity of your specimen 

 with Hall's Dentalium aciculatum I should have little question." ' 



Occurrence. — Eomney Formation, Onondaga Member. W. Va. Cent. 

 E. E. cut at 21st Bridge. 



Collection. — Maryland Geological Survey. 



Bactrites aciculum Hall 

 Plate XXXVIII, Fig. 9 ; Plate XLII, Fig. 5 



Orthoceras aciculum. Hall, 1843. N. Y. Geol. Survey, Fourth Geol. Dist, p. 243. 

 Coleolus aciculum Hall, 1879, Nat. Hist. N. Y. Pal., vol. v, pt. li, p. 187; p. 32 A, 



figs. 11-15 (16 ?). 

 Bactrites aciculum Kindle, 1912, BulL U. S. Geol. Surv., No. 508, p. 104, pi. ix, 



fig. 3. 



Description. — " Fossil extremely elongate, cylindro-conical, having in 

 the large specimens a diameter at the base (in its flattened condition) of 



' Letter of March 28, 1903. 



