92 SUPPLEMENT TO GREAT OOLITE MOLLUSCA. 



CERITHIDM(?) NEGLECTUM, Lye. . Tab. XLIV, fig. 21. 



Testa parva, subulaba, anfractibus (circa 7) subplanis, longitudinaliter costatis, costis (5), 

 magnis, deprcssis, subobliquis, a sinistro ad dextrum versus, apertura parva, canala (?). 



Shell small, subulate ; volutions (about seven) flattened, with five longitudinal large, 

 depressed, and smooth costse, which are directed somewhat obliquely from left to right, 

 and are slightly interrupted by the sutures ; the aperture is small and depressed, the canal 

 is imperfect. 



The extremities of the costae do not always exactly accord with those of the next 

 volution, which gives some irregularity to the appearance of the volutions ; no traces of 

 encircling striations are visible. 



The spire is not angulated as in C. pentagonum, the subulate figure and plain surface 

 distinguishes it from C. sexcostalum. 



Geological Position and Locality. The Great Oolite of Bussage ; collected by 

 E. Witchell, Esq. 



CERITHIUM COSTIGERUM, Piefte. Tab. XLI, figs. 11, 11 a, b. 



Testa inflata, subcylindrica , anfractibus (7 9), costis (12) rectis, angustis, elevatis, 

 postice acuminatis, lineisque transversalibm, instructis ; apertura parva, canali recto, 

 elongato. 



Shell somewhat inflated and subcylindrical, volutions (7 to 9) with the sides perpen- 

 dicular, costae (12) perpendicular, narrow, and much elevated, terminating posteriorly each 

 in a projecting point, anteriorly they bend inwards slightly to the suture, there are also 

 regular encircling lines ; the base is smooth, the aperture is small, the canal lengthened 

 and straight. 



There is much variability in the elevation of the spire, and, consequently, in the 

 height of the volutions ; a specimen more than usually lengthened has the costse some- 

 what oblique. 



Geological Positions and Localities. The Forest Marble of Laycock ; in the collection 

 of W. Walton, Esq. It is recorded by M. Piette in the Great Oolite Limestones of Eparcy 

 and Rumigny. 



CERITHIUM (?) WALTONI, Lye. Tab. XLI, fig. 16. 



Testa parva turriculata anfractibus numerosis angustis, inflatis, saturis dene impressis, 

 costis rectis angustis, elevatis (circa 11) in ambitti lineis regidaribus cingendis ; apertura et 

 canali iff not a. 



