Meyer. ] 140 ‘ [March 16, 
Caecum glabrum Montague var. Fig. 5, 
Dentalium glabrum Mont., Testacea Britannica, p. 497. 
Small ; regularly curved ; cylindrical surface smooth, shining. Septum 
not prominent, convex, very slightly mucronate. 
Those specimens of the recent C. glabrum which I was able to compare 
had a septum as regularly curved as a watch glass and without any mucro- 
nation. The septum of the Yorktown specimens, however, though at 
first sight also regularly convex, shows at a closer examination in nearly 
all cases a slight mucronation, and for this reason I consider it necessary 
to call the Yorktown specimens a variety. The Crag species which Wood 
described as C. glabrum* resembles perhaps more to this Miocene form 
than to the recent one. C. glabrum is not rare in Yorktown. 
The following is a brief review of the species of Caecum known as yet 
from the American Tertiary : 
Hocene.—1. Cecum solitarium Mr.,} Vicksburg, Miss., of middle size, 
regular curvation, smooth surface and contracted at the aperture. 2. Cx- 
cum alterum Mr.,{ Jackson, Miss., similar to the preceding, but slightly 
annulated. 
Miocene.—3. Cxecum annulatum Emmons,$ North Carolina. <A speci- 
men is in the collection of the Academy. It is very strongly annulated. 
4, Ceecum stevensoni Mr., Yorktown, Va., coarsely costated. 5. Caecum 
virginianum Mr., Yorktown, Va., smooth, large, thick, rather straight, 
septum prominent and angular. 6. Caecum glabrum Mont. var., York- 
town, Va., smooth, small, thin, curved with flattened septum. 
Pyramis promilium n. sp. Fig. 1. 
Small, subulate. The dextral nucleus is followed by five adult whorls. 
They are somewhat convex, ornamented by revolving punctuate strie, 
about four on each whorl. Base rounded, covered by similar strie. 
Mouth oval. Inner lip with a small receding fold. Outer lip thin. 
The figured specimen is not entirely adult and though not specifically 
different differs somewhat from the rest. It is less slender and the only 
one in which the punctuate nature of the revolving stris can be distinctly 
recognized. ‘he fold on the columella is hardly perceptible when the 
mouth is perfect, as in the type-specimen, but is more conspicuous in 
broken specimens. 
While in the Yorktown material most of the small species described by 
H. C. Lea from Petersburg, Va., were found, Acteon milium H. C. Lea 
was not detected. But, as it’were in place of it, above similar species 
occurs. At first sight Actseon milium seems to be very different, because 
it has a stout form and a stronger fold. The amount of slenderness, how- 
* Crag Moll., Vol. i, p. 117, Pl. 20, fig. 6. 
} Bull. i, Geol. Survey Ala.,p. 68, Pl. 8, fig. 9. 
t Ber. d. Senckenberg. Naturf. Gesellsch., 1887, p, 6, Pl. 1, fig. 8, 
2 Emmons, Geology of North Carolina, p. 274, fig. 190, 
