4 A COXTKIBUTIOX TO THE LoWER DeVONIAX FaUXAS OF MaRYLAXD 



angle bearing a distichal ; distichals 4 ( ?) x 10, the first larger than the 

 rest v,liich are transversely elongate, the last one often bearing a short, 

 stout spine ; arms 10, simple, biserial, composed of alternating cuneiform 

 plates, and often bearing at fairly regular intervals a single spine or even 

 a pair; pinnules not seen; intercostals 3 — one in the first series, large 

 hexagonal — two in the second series, hexagonal, smaller than the first and 

 situated above it and between the second costals ; interdistichals 5 or more, 

 small; interradial areas much depressed below the radial; anal interradial 

 wider than the others, the first plate large, conspicuous, highly convex, 

 resting on upper truncated edge of posterior basal and between the postero- 

 lateral radials, three plates in the second series, the middle one most 

 prominent and resting directly upon the first series, other series present 

 (indeterminate in specimens examined), the middle one always the more 

 prominent by its convexity. Stem and tegumen unknown. 



Four individuals of this species are known to the writer. Of these two 

 have spinose arms while the others seem to be without this feature. Never- 

 theless, unless further collections show this to be other than a specific 

 variation, all must be regarded as one species. 



Occurrence. — Oriskany Formation, Eidgely Member. Cumberland. 



Collection. — U. S. National Museum. 



Family MELANOCRINIDAE 



Genus TECHNOCRINUS Hall 

 Technocrinus sculptus (Hall) 



Plate XXXVI, Figs. 10, 11 



Mariacrinus {Technocrinus) sculptus Hall, 1859, Pal. N. Y., vol. iii, p. 143, 

 pi. Ixxxvi, figs. 13, 14, 1861. 



Description. — " Body unknown. Base urn-shaped, gradually expand- 

 ing above, abruptly expanded at the junction of the column : cavity for 

 the insertion of the column large. Basal plates marked by strong sharp 

 ridges, which diverge from the base to the upper margins, and unite upon 

 the lines in the direction from the angles to the base of the plates." Hall, 

 1859. 



