30 MOLLUSCA FROM THE GREAT OOLITE. 
Locality. Itis by far the most abundant of the Great Oolite Cerithia, and may usually 
be seen sprinkled over the blocks of planking at Minchinhampton Common ; but occurs 
indifferently in all the shelly beds. 
CERITHIUM LIMZFORME, Rodm. Plate VII, fig. 2. 
CERITHIUM LIM@FORME, Roemer. 1836. Nordd. Oolith., p. 142, t. 11, f. 19. 
_— — Goldfuss. Petref., iii, p. 33, t. 173, f. 17. 
—_ — Bronn. Index Paleont., p. 269. 
C. Testd turritd, anfractibus (i—S8) depressis, subplanis, cingillato-granulatis trilineatis, 
granulis majusculis approximatis costellas longitudinales formantibus, apertura ovatd, canal 
brevi truncato. 
Shell turreted, apex pointed, whorls (7—8) depressed, nearly flat, having transversely 
nodulated coste, three in number upon each whorl; the nodules are nearly jomed longi- 
tudinally, presenting the appearance of longitudinal ribs in the young shell; but in a more 
adult state the upper row becomes more distinctly separated from the other two, which 
latter have sometimes an additional row of smaller granules between them. 
This shell, as compared with C. guadricinctum, would appear to be much more rare ; 
but as it requires a close inspection to distinguish them, some uncertainty must exist. 
Locality. t accompanies the above-mentioned species in all the shelly beds. Its length 
does not exceed 3 lines. 
Crrituium sExcostatum. Plate VII, fig. 3, 3a. 
C. Testé turritd, levi, anfractibus conveviusculis, costatis ; costis (6B—7) longitudi- 
nalibus, levigatis, rotundatis, angustatis, rectis: aperturd ovatd ; caudd obsoletd, 
Shell turreted, smooth; whorls rather convex, costated; costae (7—6) longitudinal 
smooth, rounded, narrow, and straight; aperture ovate. The ribs do not form a con- 
tinuous line upon the volutions, a complete circle occupying more than 6, but less than 7 
costae, whose upper extremities scarcely reach the sutures of the whorls; the whorls are 
rather high, their junctions are deeply impressed, the last whorl beimg equal in length to 
two fifths of the entire shell. Axis. 73 lines. 
Locality. The white stone of Bussage has furnished our only example. 
CrrITHIUM PENTAGONUM, Archiac. Plate IX, fig. 22. 
CERITHIUM PENTAGONUM, Archiac. Mém. Soe. Géol. Fr., tom. 5, p. 384, t. 31, f. 6. 
—— — D’ Orb. Prod. Paléont., p. 303. 
_ _— Bronn, Index Paleont., p. 271. 
