PLATE 38, 39, 40, 41. 
P. 38 — FIG. 3. 
CONCHYLIOLITHUS Turbinites I fconstrictus ) 
conico-turritus la^vis, anfractibus superne subcoarc- 
tatls ; cingulo crenato marginali. S. p. 
A fossil shell. The original a Turbo? Conically tur- 
reted, rising by regularly decreased volutions from the 
mouth to the apex, which is small and pointed. The sur- 
face of the volutions smooth ; their number from eight to 
ten ; the form of each at the bottom rounded ; above 
(particularly in the three larger whirls) somewhat con- 
tracted : with a crenated narrow belt along the upper mar- 
gin. The mouth is small, and seemingly round : but it 
has not been sufficiently perfect to -determine the exact 
form and structure, in any specimen we have yet examined. 
Not common, Tisdexvell, The specimen figured, lime- 
stone. 
p. 39 — FIG. 4. 
CONCHYLIOLITHUS N. Orthoceratites (Brey- 
nii) elongatus conicus lajvis dissepimentis subintegris, 
antice undatis. S. p. 
A fossil shell. The original a Nautilus. Elongated, 
straight, (Syst. G. 6. Earn. Orthoceratit^ conical ; its sur- 
face even ; destitute of longitudinal furrows and stricC. 
Dissepiments approximate, concave, oblique, almost en- 
