10 A Contribution to the Lower Devonian Faunas of Maryland 



"Arms bifurcating upon the third brachial plate, and again upon the 

 third and fifth or sixth plate above the first bifurcation : bifurcation ap- 

 parently equal. Proboscis long, fusiform, very slender below, and acquir- 

 ing its greatest diameter at about two-thirds the distance from base of 

 body to summit of proboscis. Column unknown." Hall, 1859. 



The writer has not seen this species. 



Occurrence. — Oriskany Formation, Eidgely Member. Cumberland 

 (fide Hall). 



Collection. — American Museum of Natural History. 



HOMOORINUS hartleyi n. sp. 

 Plate XL, Fig. 6 



Description. — Calyx small, broadly invert-conical, expansion regular 

 from base of calyx to base of arms. Under basals 5, pentagonal, the lateral 

 edges converging downward, loM^er edge coincident with the faces of the 

 column. Basals large, largest of the calyx, convex, the four laterally situ- 

 ated are pentagonal, the posterior hexagonal and truncate above bearing 

 the anal. Eadials alternating with the basals and resting above and between 

 the four simple and pentagonal, the right posterior one being not easily 

 made out, but apparently unlike others, upper edge of all notched but not 

 profoundly. Anal large. Lower arm plates rather small, wider than high 

 and profoundly convex, making the calyx deeply excavated between the 

 arm bases. Column pentagonal, enlarged above. Arms and tegmen 

 unknown. 



The species is based on one specimen in the collection of Mr. Hartley, 

 but is quite clearly marked as a new species. It is larger than any other 

 American form referred to this genus known to the writer except Homo- 

 crinus pohjxo (Hall) from the Waldron Niagara. It has not, however, 

 the interplate ridges of that species and the radially situated plates are 

 not so deeply notched. 



Occurrence. — Oriskany Formation, Eidgely Member. Cumberland. 



Collection. — Frank Hartley. 



