254 Systematic Paleoktology 



barely discernible. Anterior basal U-shaped, truncate anteriorly. Lateral 

 radials large, irregularly hexagonal, strongly convex and cinctured trans- 

 versely. Anterior radials small as compared with the laterals, triangular, 

 not in contact, apices ending near the bottom of a deep circular depression. 

 The first brachial of the anterior ray large, wider than high, quadrangular, 

 its lower angles in contact with the lateral radials and lower lateral 

 brachials. The lower lateral brachials two, separated by depression, but 

 evidently joined by syzygy, the suture lines, however, being discernible; 

 the lower one much wider than high, quadrangular, separated from the 

 radial below by a gaping suture ; the upper one pentagonal, axial, sup- 

 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 has 

 been broken off. 



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

 site Keyser, West Virginia. 



Collection. — Maryland Academy of Sciences. 



