Houston. ] d 44 [April 20, 
about half its length. Surface regularly, closely and strongly concentri- 
cally ribbed, the ribs disappearing near the umbo. Lunule small; in- 
distinct. 
Miliolina seminulum Linné sp. 
One specimen has been found only and has been determined as above 
by Mr. A. Woodward, in New York. Though no foraminifera is men- 
tioned in Meek’s Miocene Check List (Smithsonian Miscellaneous Collec- 
tions, 1864), J. Lea has described a species from the Miocene of Maryland 
as Miliola marylandica,* and it is very probable that this name is a syno- 
nym of above. 
EXPLANATION OF PLATE. 
Fig. 1. Pyramis promilium n. sp. .......... Yorktown, Va. 
«* 2. Turbonilla paucistriata ? Jeffreys..... ui S 
«« 3. Cecum Virginianum n. sp....... weds a . 
“<4, Caecum stevensoni n: sp.is.65..0. 06. es ef 
“ “ 
‘¢ 5, Cecum glabrum Montague var...... 
j 
‘¢ 6. Astarte orbicularior n. Sp....s.seeee- 
«4, Ya. Leda pygmeea ? Muenster........ - ‘ 
<¢ 8. Modiolaria petagnee Scacchi......... - & 
“« 9. Modiola phaseolina Philippi. ........ © . 
“ 10, 10a. Semele ? virginiana n. sp........ 
“11, 11a. Carina of Scalpellum magnum. .Petersburg, Va. 
(type of Patella acinaces H. C. Lea.) 
“12, 12a. Scutum of Scalpellum magnum. . a hy 
(type of Avicula multangula H. C. Lea.) 
On some Possible Methods for the Preparation of Gramophone and Telephone 
records. By Prof. Hdwin J. Houston. 
(Read before the American Philosophical Socéety, April 20, 1888.) 
Phonograph records, of the type employed by Mr. Berliner in his gram- 
ophone, 4. ¢., those obtained by causing the point or stylus attached to the 
vibrating diaphragm to move parallel to the recording-surface instead of 
perpendicular thereto, can be prepared more readily, and by a greater 
variety of methods, than is possible with record-surfaces of the old forms. 
In a study of the later forms of phonographic apparatus, several methods 
of preparing gramophone plates have suggested themselves to the author, 
which he hopes soon to be able to put to the test of actual trial. These 
methods, though particularly applicable to records horizontally traced, 
* Contrib. to Geology, p. 215, Pl. 6, fig. 227. 
