Notice of some undescribed Infusorial Shells. 33 
Art. V.—Notice of some undescribed oe Shells ; by 
ALEXANDER 8. JoHNson, 
In a recent examination of the Piscataway and Richmond 
earths, guano from the Chincha islands off the coast of Pern and 
the so-called “Bermuda” earth, I have found a few infusorial 
shells heretofore unknown to me, and undescribed by Ehrenberg 
in his published lists of those localities. I have therefore ven- 
tured to describe them. ‘Three of the species belong to a new 
genus, here described, the fourth is an Asterolampra, and the 
fifth appears to be a Eupodiscus. 
Astrroniscus, n. g.—F ree animalcules of the family Bacillaria, 
section Naviculacea. Lorica simple, bivalve, siliceous, circular, 
from the side biconvex, not forming chains. Umbi licus smooth, 
margin of the shell in radii, which are smooth and flat, the one 
proceeding from between the two united septa being in all species 
and individuals smaller than the others, as if from imperfect de- 
velopment. The space between these radii Leased marked 
“Thy following are the three species sbiervéa a 
A. quinarius, with five marginal radii and umbilical divisions. 
Fossil in the so-called Bermuda eart tig Si 
A. senarius, with six radii and divisions. Fossil with the 
foreg on ee ; 
us, with nine radii and divisions. Fossil at Piscat- 
away, Ma ae with the foregoing. 
The other new species detected are as soligapetss 
Asterolampra septenaria, differs from A. marylandica, only in 
having seven radii instead of e eight. Fossil in earth from Rich- 
Md. 
-Eupodiscus? Tripes. Disc cellular like Coscinodiscus radia- 
tus, with three tubular processes like those of the Repeat 
Fossil in Chincha guano, near the coast of Peru. aemee 
Stconp Srnres, Vol. XIII, No. 87—Jan., 1862. 
