No. 1614. NEW AND OLD CARBONIFEROUS FOSSILS—GIRTY. 293 
Edmondia, or possibly Schizodus. ‘The lire are fine, narrow, sepa- 
rated by relatively wide, flat interspaces or striz. The following is 
Lea’s original account of this form: 
“There is too small a portion of this species remaining on the sur- 
face of the specimen to characterize it by a proper diagnosis. Per- 
haps a third of the valve only remains, but this is perfect, and beauti- 
fully and transversely striate—the strive being parallel.” 
Locality and horizon.—Pennsylvanian, Wilkesbarre, Pennsylvania. 
Ty pe-specimen.—Cat. No. 33902, U.S.N.M. 
HARTTINA INDIANENSIS, new species. 
Plate XIX, figs. 6-15. 
Shell terebratuliform, of medium size, oval to subpentagonal in 
outline, moderately convex or rather strongly gibbous. Greatest 
width about midway or a little below. A sinus is developed in the 
anterior half of the ventral valve which is sometimes broad and 
shallow, sometimes narrower and deeper. A corresponding fold seems 
to be lacking in the dorsal valve, of which the anterior portion is 
either shghtly flattened or sometimes marked by another sinus, which 
runs but a short distance back from the anterior margin. The ante- 
rior outline is often more or less reentrant. Shell finely punctate. 
Upon the interior the ventral valve is provided with two well- 
developed dental plates. In the dorsal valve there 1s probably a 
small hinge plate, from which proceeds a single rather short median 
septum about one-third as long as the entire valve. The auxiliary 
septa and platform characteristic of the genus Dielasma are not 
found. : 
The type material of this species was obtained from Pella, Marion 
County, Iowa, but the same form is represented also at Spergen Hill. 
I suspect that this species has sometimes been mistaken for /zelasma 
turgidum, which Hall and Clarke say is a typical Dielasma. It is 
possible that Whitfield’s figures” and those of Cumings and Beede? 
copied from him were drawn from a specimen of the present species. 
It seems impossible to doubt that arttina indianensis 1s a representa- 
tive of a different genus from typical Dielasma turgidum, and even 
upon its external and specific characters it has not proved difficult to 
separate our material. /7. indianensis is a larger form, less gibbous, 
seldom developing a sinus in the dorsal valve, and never developing 
a fold in the dorsal sinus, as is often the case in PD. turgidum. 
The configuration is so different from /Harttina anna, the type of 
the genus and the only other North American species, that a discus- 
sion of the differences is not necessary. Although the configuration 
of the two species is so different, it seems necessary to refer the present 
¢Am. Mus. Nat. Hist., Bull. I, No. 3, 1882, p. 54, pl. v1, figs. 56-58. 
5 Dep. Geol. and Nat. Resources, Indiana, 30th Ann. Rept., 1906, p. 1309, pl. 
XXII, figs. 56-58. 
