88 O. C. Marsh on a new genus of fossil Sponges. 
Art. XI.—WNotice of a new Genus of fossil Sponges from the Lower 
Silurian ; by Prof. O. C. Marsu, of Yale College. 
cation of attachment. The other specimen has eleven arms, a 
is nearly eleven inches in diameter, by three and a half in height. 
Both specimens are externally silicified. The main orifice, of 
mouth, is oval in form, and in the smaller specimen is situated 
at the end of a short neck, about one and one-half inches above 
the bases of the arms. po: 
As these imens are without doubt generically erie 
Roemer, of Breslau University, whose investigations have oie = | 
; in ee 
ing fossils. . A full description of these specimens, with illustra 
tions, will appear in an early number of this Journal. 
New Haven, Ct., May 25th, 1867. oe 
* Second Report on the Geology of Ky., p. 111. 
