Reports and Proceedings — Zoological Society. 331 



3. May 24, 191 1.— Professor W. W. Watts, Sc.D., M.Sc,, F.R.S., 

 President, in the Chair. 



The following communication was read : — 



" On the Geology of Antigua and other West Indian Islands, with 

 reference to the Physical History of the Carihean Region." By 

 11. J. Lechmere Guppy. (Communicated by Professor E. J. Garwood, 

 M.A., Sec.G.S.) 



After noticing the work of former observers on the geology of 

 Antigua, the author gives a brief description of the formations of that 

 island, showing that it is divided into three principal regions — (1) the 

 Volcanic (or Igneous) Region ; (2) the Central Plain ; and (3) the 

 Calcareous Formation; the first-named being, according to previous 

 authors, the oldest, as it is pre-Tertiary, and the others following in 

 succession. The Calcareous Formation, hitherto considered the 

 newest, contains fossils, of which the most remarkable is a species 

 of Orbitoides. After a discussion of these formations, and especially 

 of the evidence for the so-called ' Oligocene ' age of the Calcareous 

 Formation, the conclusion is reached that this formation is the oldest, 

 not the youngest, and is probably Eocene or older. The island was 

 raised above sea-level by the development of the great Antillian 

 dislocation, which is described, and divides each of the islands of 

 Guadeloupe and Antigua into two parts, of which the eastern is 

 calcareous and the western volcanic. In Antigua the Central Plain 

 intervenes between the two parts, while in Guadeloupe they are only 

 separated by a narrow channel. In support of this proposition the 

 physical features of Antigua are discussed, and it is shown that the 

 island has not been submerged since the volcanic period. 



The position and age of the Scotland Series of Barbados are then 

 discussed, and that series is shown to be Eocene, the lower beds being 

 possibly Cretaceous and being a remnant of the Atlantis Continent. 



The extension, age, and position of the Orbitoides Bed of Trinidad 

 are next dealt with, and some further remarks are added on the 

 physical history of the Caribean Region. 



II. — Zoological Society of London. 



May 23, 1911.— Dr. A. Smith Woodward, F.R.S., Vice-President, 



in the Chair. 



1. A paper entitled " Tooth - Germs in the Wallaby (Macropm 

 biUardieri) " was presented by Dr. A. Hopewell Smith, M.R.C.S., 

 L.R.C.P., and Dr. H. W. Marett Tims, M.A., F.Z.S., F.L.S. 



The material upon which their observations were based had been 

 kindly sent to the authors by Mr. Brooke Nicholls, of Melbourne, it 

 consisted of three embryos of Macropas biUardieri. The smallest 

 specimen (allowing for the difference in size of the adults of different 

 species) was considerably younger than that of any other Diprotodont 

 previously examined. In the upper jaw they had identified six 

 incisors, thus confirming M. F. Woodward's original statement. The 

 functional incisors of the adult appeared to be the second, fourth, and 

 sixth of the series. There were four premolars, of which the first, 

 third, and fourth persisted. There was also one molar tooth. 



