296 
IOWA ACADEMY OP SCIENCE 
when whole. The thirteen posterior segments average twenty-two 
millimeters in length. It was obtained at the Parley Quarry, North 
Parley, Dubuque county. 
Occurrence and Locality: In Niagaran dolomite at Hopkin- 
ton, Delaware county, and at Farley, Dubuque county, Iowa. In 
collection of the State University. 
Huronia o'bliqua Stokes. 
Plate XXXIII, figure 2. 
1824. Huronia o'bliqua Stokes. Trans. Geol. Soc. London, second series, 
Vol. i, pt. ii, p. 203, PI. xxviii, fig. 4. 
Siphuncle straight, smooth, tapering at the rate of a little over 
one millimeter for each segment length. Transverse section cir- 
cular. Segments short in proportion to their lengths — seven 
having a total length of one hundred millimeters while their 
average greatest diameter is 37.4 mm. The obliquity of the plane 
passing through the line of contact of any two jpints is 97°. This 
exceeds the obliquity of any other species of this genus with the 
exception of some of the gerontic siphuncles of JS. vertebralis. 
Endosiphuncle central and proportionately smaller than in the 
preceding; the actiniform lamellae well developed. 
Occurrence and Locality : The only specimen in the Univer- 
sity collection is labelled Niagaran, northeastern Iowa. 
Huronia subcylindrica sp. nov. 
Plate XXXIV, figure 4. 
Siphuncle straight, round in cross section, sides parallel, or 
nearly so ; the specimen consists of seven segments, four of them 
whole. It shows no appreciable tapering. 
The segments are about one-half as long as their average, dia- 
meter and their nearly parallel sides give them a cylindrical ap- 
pearance. The anterior end of each segment is partly set off 
from its main body by a sort of uneven contact which somewhat 
resembles the epiphyseal surface in the limb bones of young 
mammals. The contact between two segments is slightly oblique. 
The endosiphuncle is six to eight millimeters in diameter, is 
out of the center by about one-half this amount, and its wall is 
wrinkled and irregular. The lamellae are strong, more or less 
convoluted, and are irregularly arranged. 
Fragments of the thin proximal edges of the septa are present 
between all the joints; they enter between them at an angle of 
nearly 45° from the vertical. 
