38 BULLETIN 164, UNITED STATES NATIONAL MUSEUM 



Formation and locality. — Upper Canadian, Santao formation : A 

 grayish limestone bowlder believed to have come from the Santao 

 formation, in river drift at the Pen-hsi-hu colliery, Liao-tung, 

 Manchuria. 



Holotype.—U.S.'^.U. No. 83619. 



Genus CALATHIUM Billings, 1865 



CALATHIUM FRECHI, new species 



Plate 30, Figttbe 9 ; Plate 31, Figtjbes 5, 6 



Description. — Holotype specimen 40 mm long, rather cylindrical ; 

 its shorter and longer axes 21 and 26 mm, respectively. The cup is 

 estimated at 14 mm in diameter at the top and 21 mm in depth; it 

 gradually narrows downward and extends nearly to the middle of 

 the specimen. A line divides the sponge wall into two layers, an 

 inner one that has approximately an even thickness throughout the 

 cup wall, and the outer one, which is on the whole thicker. Its 

 greatest thickness is near the base, diminishing toward the top. 



Both layers are interpenetrated by the pores, and the penetration 

 extends farther into the inner than into the outer layer. The pores, 

 or canal apertures, are round and arranged quite regularly, about 

 six in 22 mm of the length of each vertical row, and five in 2 mm in 

 the transverse rows. 



A second specimen is 14.5 mm long, cylindrical; the diameters of 

 the sponge wall and cup are estimated as 13 and 5.5 mm, respectively, 

 at the base of the cup. The pores are round and are spaced about 

 5.5 in 2 mm of the length of each vertical row, and 5 in 2 mm in 

 the transverse rows. 



Comparison. — The general features of this species recall Ca- 

 lathiv/m canadense Billings from the Chazy limestone, Mingan 

 Island of North America, but the smaller pores and comparatively 

 wider cup serve readily to distinguish it. 



Formation and localities. — Upper Canadian, Santao formation: 

 In the gray banded limestone above the second tunnel, 1 mile north 

 of Pen-hsi-hu and in the black banded limestone, near Shang-kang- 

 3'ao, 3 miles southeast of the Yen-tai colliery, Liao-tung, Manchuria. 



Holotype and parafype.—U.S.l^.M. Nos. 83620 and 83621. 



Genus CAMAROCLADIA Ulrich and Everett, 1890 



CAMAROCLADIA ARBORESCENS, new species 



Plate 10, Figures 3, 4 



Description. — This sponge has a rather large subcylindrical stem 

 with a diameter of about 11.5 mm along which large clusters of 



