Review of Recent Geological Literature. 63 
3. Another portion of a vertical section, X 18, showing the entire 
thickness of a narrow layer of tubes, and the minutely punctate charac- 
ter of their walls. 
Figs. 4-8, ChvKtetes ponderosus, n. sp, 
4. Tangential section, X 18, with part of a cluster of large cells. 
5. Portion of another section, X 28. 
6 and 7. Walls of two tubes, X 50, showing minute structure, the first 
with the wall thick, the second below the average in thickness. 
8. Vertical section, X 18, showing structure of walls of two tubes 
The constrictions of the walls are nearer each other than usual. 
Figs. 9-10, Ch.etetes, sp. undet., from the Eifel of Germany, 
9 and 10. Vertical and transverse sections, X 18. 
Figs. 11-14, Ch.etetes millepokaceus Ed & H. 
11, 12 and 13. Small portions of three transverse sections, X 18, 
showing variations in wall-structure, 
14. Two tubes of a vertical section, X 18, showing wall-structure and 
arrangement of diaphragms. 
Figs. 15-16, Cn.KTETEs piliformis Schlliter, sp. 
15 and 16. Small portions of transverse and vertical sections, X 18. 
EEVIEW OF RECENT GEOLOGICAL 
LITEEATUEE. 
Tertiary Plants from Bolivia. — In the Trans. Amer. Ins. M. Es. (.lune, 
1892), Prof. N. L. Britton describes a number of Tertiary plants collected 
by Dr. A. F. Wendt at the silver mines of Potosi. The plants were found 
in a fine-grained sandstone which, according to Prof. Kemp, who made a 
microscopic examination of the rock, is undoubtedly volcanic glass and 
pumice. The fossils are very fragmentary, and the author is inclined to 
the opinion that some of the species represented are the same as living 
forms. Myrica hanksioides Engelhardt, Cassia rhrysomrpoidcs Engl., and 
G. ligustrinoides Engl., appear to be the most common. Ten new species 
are described and seventy-nine figured, of which ten are undetermined. 
Geology of Maryland. — Johns Hopkins Univ. Cir. No. 95, pp. 37-39. 
Under the auspices of Drs. G, H, Williams and W, B, Clark, the univer- 
sity geologists made seven excursions in the vicinity of Baltimore, and a 
short notice of the results is given in the present paper. 
For geological work this university is perhaps more favorably situa- 
ted than any other institution. The state presents all the periods from 
the Archa-an to the Tertiary, and much of this is within a short journey 
of Baltimore. Perhaps the most interesting excursion from a pala'onto- 
logical point of view was that to Fort Washington, on the Potomac river. 
A section is here most beautifully exposed and consists of Pleistocene 
8 ft., Eocene 12 ft., Cretaceous 20 ft,, Potomac 55 ft. The first and last 
being at this point non-fossiliferous. Nq oe\y evidence is given regard- 
ing the position of the Potomac group. 
