GASTEROPODA. 115 
The figure is lengthened, almost subulate, the convexity of the volutions being but 
slight ; their transverse diameter exceeds their length by about one third. Longitudinal 
dimensions 5 lines, transverse diameter 2 lines. 
Locality. Near Scarborough. 
CERITHIUM GEMMATUM. Plate XV, fig. 6. 
C. Testé parvd, turritd ; anfractibus convexiusculis, nodulis cingillatisque 5 ; nodulis 
ovatis subdistantibus, circa 24 in ambitu. 
_ Shell small, turreted; volutions rather convex, encircled with five rows of nodules ; 
nodules ovate, about 24 im a volution; the rows of nodules are slightly curved, and the 
last volution has from 7 to 9 rows. 
The little nodules are regular, oval, their longer diameter bemg im the axis of the shell, 
and they are distant from each other about their own diameter; the number of volutions 
are but few, apparently not more than 7. Length 7 lines, transverse diameter 2 lines. 
Locality. Great Oolite near Scarborough. 
Cuemnitzia ? ScarBurcensis. Plate XV, fig. 8. 
C. Testd magna, pyramidato-turritd, levi ; anfractibus subplanis ad suturas subplicatis, 
aut vittd latiusculd transversd, plus minusve converd notatis; aperturd ovatd, superneé 
strictissimd ; columella marginatd, supra subcallosd. ? 
Shell large, pyramidal, turreted, smooth; whorls nearly flat, but with one fold near to 
their sutures, or with a broad transverse band more or less convex ; aperture ovate, very 
narrow above ; columella marginated, thickened above. 
The upper border of the whorls is slightly turned, their junctions are strongly defined. 
The longitudinal diameter of the penultimate whorl is 7 lines, the transverse diameter 
10 lines. 
Locality. The specimen forwarded to us by Mr. Bean is from the dark-gray shale of 
the Great Oolite near Scarborough. It is only a cast, and much compressed, so that the 
specific character cannot be sufficiently determined. 
Trocuus Leckensi. Plate XV, figs. 21, 21a. 
7. Testd conico-depressd, anfractibus (A—5) planis, costulis rotundatis crebris cinetis ; 
