A CONTRIBUTIOX TO THE LoWER DEVONIAN FAUNAS OF MARYLAND 41 



DiAPHOROsTOMA DESMATUiM Clarke 

 Plate LXXXVI, Figs. 13, 14 



DiapJwrostovia dcsmatum Clarke, 1900, Mem. N. Y. State Mus., vol. iii. No. 3, 



p. 29, pi. iii, figs. 13-19. 

 Platyostoma clesmatiim Weller, 1903, Pal. N. J., vol. iii, p. 262, pi. xlix, fig. 12. 



Description. — The U. S. Xational ]\Iuseum has a very small specimen 

 of this species from the Lower Oriskaiiy. The species lacks a definite de- 

 scription; what has been published being comparisons rather than de- 

 scriptions. The specimen figured was identified by Schuchert. 



Occurrence. — Oriskany Formation, Shriver Member. 21st Bridge. 



Collection. — IT, S. Xational Museum. 



Order OPISTHOBRANCHI ATA 



Suborder CONULARIDA 

 Family TENTACULIDAE 



Genus TENTACULITF.S Schlotheim 

 Tentaculites ? Acus Clarke 

 Plate LXXXA'TI, Fig. 5 



Tentaculites ? acus Clarke, 1900, Mem. N. Y. State Mus., No. 3, vol. iii, p. 28, 

 pi. iii, figs. 1-7. 



Description. — " Shells having as large size as those of T. elongatus but 

 with the exterior surface smooth or with very faint^ distant, broad, eon- 

 centric depressions and fine, indistinct and somewhat irregular growth 

 striffi. The internal cast is similar to that of T. elongatus, but has the 

 constrictions less deep. Specimens of this species are not uncommon. The 

 wall of this species is thick and cellular, and a transverse section gives 

 two or more concentric circles at any ^Dlane, showing the ensheathment 

 of the funnel-like divisions of the interior. This structure is much more 

 pronounced than in any species of Tentaculites observed by the writer 

 and, though more regular than in Cornulites, may jjrove to be of the same 

 nature." Clarke, 1900. 



