~*~ 
On the markings of the Carapax of Crabs. ° ‘95 
Hypoxyton pinzrorme, Berk. and Curt. ;—globosum, stipita- 
tum et sessile, piceo-laccatum ostiolis prominulis exasperatum, 
intus album.—Ad lignum. Oahu. 
There are but two specimens of this, one of which is depresso- 
globose, produced at base into a short rugged stem nearly as long 
as the head, the whole # of an inch high; the other sessile, or 
with a mere rudiment of a stem, and deformed as if by the par- 
tial confluence of two or three heads, thus somewhat resembling 
a small undulate form of S. concentrica.—The species is closely 
allied to H. polymorphum, but the sporidia are shorter and thicker. 
It resembles also S. obovata, Berk., and S. poculiformis, Mont. 
Arr. XIl—On the markings of the Carapax of Crabs; by 
James D. Dana. 
Te areas into which the surface of the carapax of Crabs is 
subdivided were imperfectly distinguished and named by Desma- 
rest. This author designated the regions according to the internal 
parts which they covered. But there is a system in the mark- 
