W. B. Dwight—Fossils of the Wappinger Valley. 259 
BATHYURUS (?) CROTALIFRONS. 
Fig. 4. View of a gutta percha - taken from a natural mould, showing the 
glabella and fixed chee 
Fig. 4a. Profile view of s 
Fig. 5. View of gutta percha ‘cast of pa ee of the i ebegs i rei of 
ing the o 
ted on the right side of the glabella, especially the 
sich ines han fn acter belonging perhaps to some other individual. 
ORTHOCERAS VASSARINA. 
Fig. 7. adi view of a ternal cast, carrying portions of the smooth shell, 
owing euatty the chamber of habitation, septal sutures, and curva- 
nies of the septa. The smooth surface to the right mane, % has been 
; polished to show the siphuncle which appears i sa che fi 
Fig. Ta. Transverse section of upper portion of same, showing the oak tion of the 
siphunel in part of fig. 
the dorso-ventral axis. The sags part of this section shows a dis- 
sae mee by flattening. The broken straight eb oe the points of - 
mum forward deflection or the septal su 
Fig. 8. Dorval arose of internal mould (wi og dpe of shell) of another individual, 
showing the upward arching ee the septa, and the m: ok gana siph nuncle- 
a little pai at its points of junction with the septa. 
CYRTOCERAS DACTYLOIDES. 
Fig. 9, A yes defined specimen, the lower third of which is the eylindri 
rnal mould, showing the sutures, while the upper two-thirds cgi 
i secti me, showing the 
Fi arge marginal siphon, and the curvature of the sep 
'g. 9a. A transverse aon at “the lower end, showing the size of the eiphapole: 
at that poin 
ONCOCERAS VASIFORME. 
Fig. 10. A ari vertical median plane section, not iiies rectangular to the 
ventral ax 
Fig. 10a, ‘. artificial transverse section of the rete 4m from the lower 
end, showing the position of the siphun 
Cristiani MICROSCOPICUM. 
Pe ILA eet vertical median —_ section passing probably nearly in the 
plane of the dorso-ventaal a 
ORTHOCERAS SPISSISEPTUM. 
ie 12 & hetural longitudinal section, showing a few of the septa. 
" ORTHOCERAS HENRIETTA. 
Fig. 13. 4 Sagemoepi vertical section showing the chamber of habitation, and some 
of the septate 
Rig. 14. A similar , Somewhat oblique section of another individual, showing ee 
siphuncle nal lower e: 
Fig. la. a polished transverse section of the lower end of the same showing the : 
_ position of ¢ the siphuncle. ' 
