289 



/ 



TELAMOX. 



(Pal. N. Y., 

 p. 291, PL 



Ortltoct'- 



Natu- 



FlG. X!25, 

 ras nuntium 

 ral size, and a por- 

 tion of the surface 

 enlarged (after Hall). 



chamber: livino- clianibor more than three times as long as 

 its basal diameter; siphnnele one-third the diameter of the 

 shell h'om the margin. 



Fonnd in the "Hamilton 

 gronp, on the sonth Shore of 

 Lake Erie" (Hall); doubtfnlly 

 in and above the Modiomorpha 

 bed. 



RTHOCEK AS 



Hall. (Fig. 223.) 

 Vol. v., Pt. n., 

 LXXXV.) 



Distin^iii I isli in a; Ch n i -a cters . — 

 liegulai-l V and gradually enlarg- 

 ing tube ; circular cross-section ; 

 apical angle four degrees ; cylin- 

 drical living chamber about 

 three times as long as its l)asal 

 diameter; depth of air cham- 

 bers 5 mm., where diameter of 

 shell is 9 mm.; concavity of 

 septa equal to an arc of about 

 110 degrees; large excentric 

 siphuncle, less than one-third 

 diameter from the margin. 



Found in the Encrinal lime- 

 stone, at Section 5 (rare, and 

 somewhat tioubtful). 



Orthockuas aulax. Hall. 

 (Fig. 224.) (Pal.N.Y., Vol. V., 

 Pt. XL, p. 293, PL LXXXIV.) 



Distinguishing Characters. — Slender, very 

 gradually enlarging tube; numerous regular, cefal emucer^tmn. 

 low, rounded, transverse surface ridges, about f rom Si^e E^rie ua'f- 

 twelve in the space of 10 mm., with regularly 

 concave interspaces, e(pial in width to the ridges; fine, sharp 

 longitudinal stria?. 



S 



