A Contribution to the Lower Devonian Faunas of Maryland 9 



porting on its horizontal edge a vertically ascending arm, and on its 

 vertical side another axial plate which likewise bears an arm and a plate 

 and so on until the number of lateral arms is eight; the axial plates form 

 a marked ridge running along the bases of the arms. Lateral arms 

 cylindrical, branching at about every fourth joint, which is nodose. An- 

 terior arm much more robust than the lateral, cylindrical, its plates sepa- 

 rated by deep incisions, not branching at least below the twelfth plate. 

 Anal plates two, triangular, separated from the basal disk by a deep semi- 

 circular fossa, and truncate above. 



The upper surfaces jointly support a large anal tube which is larger 

 at its base than the anterior arm, and decreases in size upward at least to 

 the third plate where the tube disappears within the enfolding lateral 

 arms. The posterior half of this anal tube is composed of large semi- 

 cylindrical plates, but the anterior (interior) portion is invisible. Stem 

 robust, composed evidently of plates uniform in size. The species is based 

 on a specimen in the Museum of the Maryland Academy of Sciences col- 

 lected by John Widgeon. This specimen seems, however, quite distinct 

 from any heretofore described, and so far as the writer knows is the first 

 occurrence of this genus in the Lower Devonian. The writer is informed 

 that when found the stem was separated from the calyx so that only pre- 

 sumably are they the same individual. The upper portion of the arms ha3 

 been broken off. 



Occurrence. — Oriskany Formation, Eidgely Member. Quarry oppo- 

 site Keyser, West Virginia. 



Collection. — Maryland Academy of Sciences. 



Family CYATHOCRINIDAE 



Genus HOMOCRINUS Hall 



HOMOCRINUS PROBOSCIDALIS Hall 



Plate XL, Figs. 4, 5 



Homocrinus proboscidalis Hall, 1859, Pal. N. Y., vol. iii, p. 138, pi. Ixkxv, figs. 

 24, 25, 1861. 



Description. — " Body subturbinate ; base large. Basal plates wider 

 than long, hexagonal. Eadial plates about as long as wide ; brachial plates 

 resting upon the truncated edges of the radial plates. 



