Apr, 1899. PALEONTOLOGY OF UPPER CRETACEOUS SERIES—LOGAN. 215 
FUSUS sf. 
(Pl. XXV, Figs. 2 and 5. Mus. No. P 5942.) 
The shells of these specimens are entirely absent and a specific 
determination is not warranted upon evidences such as are presented 
by casts alone. The reader is asked to compare the figures of these 
specimens with the figures of “usus staminea, Conrad. The forms rep- 
resented here were found associated with Rosfeliites, and the above 
described species. 
ASTROCCENTIA CONICA, 7. sp. 
(Pl. XXVI, Figs. 1,2 and 3. Mus. No. P 5946.) 
Corrallum tuber-like, about the size of a medium-sized orange; 
corallets inversely conical, not greater than 8mm. in diameter, calices 
of the corallets of moderate depth, six sided but not always distinctly 
so, with moderately thin interstices but bordering each other; colu- 
mella distinct but not prominent; intersection of dissepiments and 
septe forming prominent carine; vertical septe extending more than 
half the distance to the columella, the secondary ones only about half 
the length. Specimen somewhat weathered so that generic charac- 
ters are doubtful. 
This specimen is interesting as being the only species of coral as 
yet described from the Benton of the Interior Cretaceous. It was 
collected by the writer from the Lincoln Marble horizon on Rattle- 
snake creek in Mitchell County, Kansas. 
PSEUDO-PERNA WILSONI, z. sp. 
(Pl. XXVI, Figs. 4 and 5. Mus. No. P 5945.) 
Shell thin, capacious, triangular in general outline with short 
beaks turned slightly toward ventral border, and fitting closely. 
Lower valve thick on the margins, thin centrally; not as capacious as 
upper valve and nearly flat on the adhering surface; fluted on margin 
in some specimens, and lacking the symmetry of outline noted in 
upper valve; ventral border possessing a triangular excursion near 
the central portion; dorsal border, concave; posterior border, convex. 
Upper valve, flat or nearly so on postero-ventral wing, convex in 
general; ventral margin in region of beak crossed by slight ridges of 
