CONUS. ORTHOCERA. 141 
ly, longitudinally, or in bands. At times the shell 
is white, and the spots clouded with orange or 
violet blue; towards the base it is slightly grooved; 
and the spire is acuminated, with its lower whorls 
slightly concave. 32. W. 16. 136. 
CEPHALOPODES. 
ORTHOCERA. 
Elongated, straight, or slightly curved, sub-coni- 
cal, striated externally by numerous longitu- 
dinal ribs; chambers formed by transverse 
septa, perforated by a central or marginal 
tube. 
OQ. costatus. Sub-cylindric, straight, with 
four strong longitudinal ridges, but little taper- 
ing; sub-globose; twelve chambers. 7. B. W. 
13. 25. 
O. sucosus. Sub-cylindrical, slightly curved, 
with numerous longitudinal ribs, and nine globose 
chambers, the first the longest, the last produced 
into a conical neck, with a round aperture ; brown. 
mae. WV. 13. 22. 
