-50 TJic A)ncrican Geologist. April, isas 
Whitfield, R. P. 
Note on the hypostome of Lichas (Terataspis) grandis Hall. (Am. 
Mus. Nat. Hist., Bull., vol. 9, pp. 45-46, 1897.) 
Whitfield, R. P. 
Descriptions of new species of Rudistae from the Cretaceous rocks 
of Jamaica, W. I., collected and presented by Mr. F. C. Nicholas. (Am. 
Mus. Nat. Hist., Bull., vol. 9, pp. 185-196, pis. 6-22, 1897.) 
Willis, Bailey. 
Drift phenomena of Puget sound. (Geol. Soc. Amer., Bull., vol. 9, 
pp. 111-162, pis, 6-10, Feb. 8, 1898.) 
Williston, S. W. 
The Pleistocene of Kansas. (Kans. Acad. Sci., Trans., vol. 15, 
pp. 90-94, 1898.) 
Williston, S. W. 
Notice of some vertebrate remains from the Kansas Permian. (Kans. 
.\cad. Sci.. Trans., vol. 15, pp. 120-122, 1898.) 
Wilson, J. W. 
Geology of Efifingham ridge [Kansas]. Preliminary report. (Kans. 
Acad. Sci., Trans., vol. 15, pp. 113-114, 1898.) 
Wortman, J. L. 
The Ganodonta and their relationship to the Edentata. (Am. Mus. 
Nat. Hist., Bull., vol. 9, pp. 59-110, 1897.) 
CORRESPONDENCE. 
Archean Ch.\racter of the Nuclei of the Antilles. In a pa- 
per read by me before the British Association for the Advancement of Sci- 
ence at the 15th or Bath meeting in 1888, I explained the petrographic 
reasons which had led me to conclude after a careful study of a large 
number of specimens that the rocks forming the nucleus of the island of 
Ciiba were Archean. I also gave reasons why I considered it a not un- 
reasonable inference that Hayti, Jamaica, Porto Rico, and the Wind- 
ward islands, as well as Yucatan and Florida were likewise provided 
with Archean nuclei; and that this implied a branch or fork of the Ap- 
palachian chain and the enclosure of the Caril)l)ean sea by an Archean 
wall now largely broken down. 
In a paper recently issued by Dr. W. Bergt, on the geology of San 
Domingo (Zur Geologie von San Domingo; Abhandlungen der Natur- 
wissenschaftlichen Gesellschaft "Isis" in Dresden, 1897, Heft, H) the 
author fully confirms the suspicion with regard to .San Domingo and 
agrees with my earlier statement of the probabilities of this structure. 
These views received the attention of Bonney, Renard and all the 
petrographers who attended the 5th International Geological Congress, 
and the 15th Session of the B. A. A. S. in 1888, and I believe the petro- 
