520 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 127 
ATELELASMA HOLSTONI (Hall and Clarke) 
Orthis ? holstoni Safford in Hatt and CLarKE, Pal. New York, vol. 8, pt. 1, pp. 218, 340, 
pl. 5A, figs. 35-37, 1892. For additional synonymy, see Basster, U. S. Nat. Mus. Bull. 92, 
p. 892, 1915. 
Type.—Holotype: New York State Mus. 7922/1. 
Horizon and locality—Probably Hogskin member or Arline formation, vi- 
cinity of Knoxville, Tenn. 
Discussion.—The description of this species is in such general terms and the 
stratigraphic horizon is so uncertain that it was not possible to identify any of 
the species recorded herein with it. Hall and Clarke record the horizon and lo- 
cality as “Glade limestone” (Lebanon) from near Nashville. This is certainly 
a mistake, and the Bassler correction to the vicinity of Knoxville is probably 
more nearly correct. The formation from which the specimen came is possibly 
Arline but is more probably the Hogskin member. 
ATELELASMA ? MULTICOSTUM (Hudson) 
Plate 80, F, figures 26-34 
Syntrophia multicosta Hupson, New York State Mus. Bull. 80, p. 285, pl. 5, figs. 8-15, 1903. 
Clitambonites multicostus (Hudson) RayMonp, Ann. Carnegie Mus., vol. 7, p. 247, fig. 23; 
pl. 36, figs. 10-14, 1911. 
aff. Vellamo multicosta (Hudson) ScHUCHERT and Cooper, Mem. Peabody Mus. Nat. Hist., 
vol. 4, pt. 1, pl. 7, figs. 5, 8-11, 1932. 
Types.—Figured hypotypes : 110117a-d; A.M.N.H. 25048/1,/3; Y.P.M. S359. 
Horizon and locality—Crown Point formation in New York on Plattsburg 
(15’) Quadrangle: Valcour Island, Plattsburg. 
Same formation in Vermont: On Isle La Motte, Rouses Point (15’) Quad- 
rangle. 
Discussion—This little species was once found in abundance on Valcour 
Island. Here the specimens were taken in the form of loose shells entirely free 
of matrix. Specimens in the National Collection show a trace of the plates along 
the sides of the delthyrium which are so characteristic of Atelelasma. A single 
specimen in the Yale Peabody Museum collection (catalog number S359) shows 
a small imperforate vestigial pseudodeltidium at the apex. This feature was not 
seen on any other specimens of Atelelasma including the superb silicified speci- 
mens from Friendsville. This pseudodeltidium is very much like that seen in 
Kullervo punctata. 
ATELELASMA OBSCURUM Cooper, new species 
Plate 78, D, figures 21-31 
Fairly large for the genus, wider than long and with the greatest width at the 
hinge ; cardinal extremities acute; sides sloping medially ; anterior commissure 
rectimarginate. Surface multicostellate, costellae narrowly rounded with inter- 
spaces about equal in width to the width of the costellae; costellae numbering 
