SILURIAN FAUNAS. 257 
BYTHOCYPRIS NEARPASSI Nn. sp. 
Plate XXIII., Fig. 12. 
Description.—Carapace suboval in outline, twice as long as high, 
much narrower in front. Ventral margin nearly straight, dorsal 
margin gently convex, posterior margin broadly rounded, anterior 
margin narrowly rounded. Valves strongly convex, their surface 
smooth. The left valve overlapping the right along both the dorsal 
and the ventral margins. 
The dimensions of one of the type specimens are: length, 1.33 mm. ; 
height, 0.66 mm. 
Uncertain Species. 
In addition to the species enumerated, there are several forms 
too imperfectly preserved for identification or description. Several 
specimens are fragments of a horn coral, but the preservation is not 
such as to allow even the genus to be determined with certainty, 
although it is probably a Zaphrentis. Several additional pelecypoda, 
most of them in a very imperfect state of preservation, have been 
observed. One of these is the anterior extremity of a small shell, 
with conspicuous, concentric markings, like those on Grammysia or 
Allorisma. Another specimen is apparently an imperfect Orthoceras, 
although no sutures can be detected. 
DESCRIPTIONS OF SPECIES IN THE Ronbout FAUNA. 
PROTOZOA. 
FORAMINIFERA. 
In the “pethstone” bed (2 A*® of the Nearpass section) of the 
Rondout formation small, subglobular or more or less irregular bodies 
may sometimes be detected, which are not certainly organic, but which 
suggest some forms of foraminifera. It is possible that they are the 
fossil remains of some of these lowly organisms. 
7, 
