Foerste.] 
284 
[May 1, 
Orthoceras (Kionoceras) Crawfordi, sp. nov. 
(PLATE y, FIG. 26.) 
The type specimen was found by Mr. Ira Crawford, at Soldier’s 
Home, Ohio. It is 46 mm. long and contains in that length eighteen 
septa, the septa at the smaller end being 2.5 mm. distant from each 
other, those of the larger end 3 mm. It has a diameter of 11.7 
mm. at the smaller end and 20 mm. at the larger extremity. A 
cast of the interior of the shell shows a faintly raised straight line 
along one side of the cast, scarcely .2 mm. wide, similar to that fig- 
ured by Hall and Whitfield under Orthoceras Duseri. The exte- 
rior of the shell is finely striated longitudinally, the strife being 
sharp and distinct, nine or ten striie occupying a width of 2 mm. 
The exterior of the inner layer of the shell is smooth. The septa 
are moderately concave, forming an arc of about 76°. The siphon is 
central and is composed of small, oval annulations placed between 
the septa. These annulations have a diameter of about 2 mm. 
near the middle, decreasing in size as they approach the septa, 
through which they are connected by an aperture scarcely exceed- 
ing 1.2 mm. 
Orthoceras (Actinoceras) Youngi, sp. nov. 
(plate VIII, FIG. 3.) 
A small fragment from Hanover, Ind., presenting, however, all 
the characters necessary for the identification of a species, is taken 
as the type. The specimen is 33 mm. long and contains in that 
length seven chambers and eight septa. The chamber near the 
larger end is 4.2 mm. deep between the septa and the distance be- 
tween the septa at the smaller end does not show any appreciable 
difference. The diameter of the shell at the smaller end is 27 mm., 
at the top of the fifth chamber of the specimen 32 mm., at the top 
of the specimen it is calculated to have been 34 mm. The shell has 
a thickness of about .5 mm. Its exterior surface is smooth, show- 
ing neither longitudinal nor transverse striations. The septa are 
of medium concavity, forming an arc of about 115°. The siphon 
is central and is composed of strongly marked annulations, these 
annulations having a transversely, elliptical section, having a di- 
ameter of about 7 mm., where the shell is 29 mm. broad, and the 
