42 MOLLUSCA FROM THE GREAT OOLITE. 
Narica Srrickuanpi. Plate XI, figs. 24, 24a. 
NV. Testa ovatd, spird elatd, anfractibus convewiusculis, superne rotundatis, suturis sub- 
depressis ; apertura oblique ovata ; basi angustatd. 
Shell ovate, spire elevated, whorls rather convex, rounded above, their sutures slightly 
depressed ; aperture oblique and ovate; base attenuated. 
The length of the aperture scarcely exceeds half of the entire shell; the whorls, which 
are not numerous, are moderately wide, and somewhat flattened at their base; the apex is 
rather obtuse, and the general form is more cylindrical than is usual with shells of this 
genus, the largest transverse diameter being only equal to the length of the last and penul- 
timate whorl. We have only obtained two specimens which occurred in the soft shelly 
Oolite underlying the planking, but, judging from casts, we should be inclined to believe 
the upper portion of the formation likewise contains it. It has been named as a trifling 
tribute of respect to H. E. Strickland, Esq., one of the few English geologists who, of late 
years, have contributed to our knowledge of the Oolitic system. 
Locality. Minchinhampton. 
Natica Formosa. Plate VI, fig. 10. 
NV. Testd ovato-elongatd, spird elatd, anfractibus (5) convewis, ultimo anfrdactu oblique 
ventricoso ; apertura magna ovata ; bast rotundatd, labro sinistro excavato. 
Shell ovately-elongated, spire elevated, whorls (5) convex, the last whorl ventricose and 
oblique ; the aperture large, ovate, the inner lip excavated, the base rounded. 
We were at first disposed to refer this species to MVatica elegans, Sowerby, but an 
examination of additional specimens has convinced us of its specific distinctness. As com- 
pared with that species, the spire is always much larger, and less angulated, and the 
aperture bears a much less proportion to the entire length, its longer diameter scarcely 
amounting to three fifths of the entire length of the shell. It occurs both in the planking 
and upper portion of the formation, but is somewhat rare. Length 26 lines, breadth 
20 lines. ‘The apex, when perfect, is more acute than our figure represents. 
Locality. Minchinhampton. 
Natica Tancrepi. Plate VI, fig. 11. 
NV. Testa ovatd, spird elatd, anfractibus (5) angustatis in medio subangulatis ; apice 
obtuso ; anfractu ultimo subcylindrico, permagno ; apertura obliqua angustata ; basi sub- 
acuminata. 
Shell ovate, spire elevated, whorls (5) narrow, somewhat angulated in their middle 
portions ; the apex is obtuse, the last whorl is very large, and subcylindrical ; the aperture 
oblique and narrow, the base somewhat pointed. 
