528 i>Roi'. J. w, si>enceii ok tbe geological and [Nov. 1901, 



Anguilla; Echinometra aeufera, Blainville, still living, but the 

 fossil is of smaller size ; Cidaris melitensis, Forbes, found in 

 Anguilla; and Clypeaster eUipticus, Michelin, but the original 

 locality was not known to Mr. Guppy. I found three of the 

 species mentioned by him. Prom these resemblances to Miocene 

 forms and the local types, and from the scarcity of the living 

 species, occurring in ODly rare cases in the Anguilla beds, 

 Mr. Guppy considers that these fossils add additional evidence of 

 the Miocene age of the beds. 



Among the corals which I obtained, a Siderastrcea belongs to 

 this general period, while two species — Orhicella cavernosa, Linn, 

 and Madrejoora muricata, Linn. var. palmata, Lam. — are living 

 species, and evidently belong to the higher formation mentioned. 

 These were kindly determined for me by Dr. T. Way land Yaughan. 



The evidence suggests that the Lower White Limestones of 

 Anguilla belong to the Oligoceue Period, and were deposited at 

 the same time as the similar beds in Antigua. The upper strata, 

 with a modern fauna similar to that of the Pointe a Pitre Usine 

 limestones of Guadeloupe, are of later date, and were accumulated 

 at a distance from the rocky shores of St. Martin, then reduced to 

 small islands, about which the mechanical deposits of Point Blanche 

 were being laid down. 



Tintamarre is a small limestone-island covered with thin soil 

 in the northern portion, while the surface, which slopes southward, 

 is capped by a sandy deposit. The northern and north-eastern 

 coasts are characterized by bluffs of white limestone and marl, in 

 nearly horizontal strata similar to those of Antigua. In the upper 

 part of these beds I obtained a few fossils, among which were two 

 coTals—Orbicella cavernosa, Linn, and Diploria labyrinthiformis 

 Linn., both recent species. At the north-eastern end of the 

 island is a cove showing cliffs rising to a height of 50 or 60 

 feet. Here the material is a light-coloured homogeneous marl, 

 almost a calcareous sandstone, in which is included a thick layer 

 of nodular limestone. The beds are sharply faulted, and upon 

 their surface is a second nodular layer ; they represent the 

 lower calcareous beds of the island. The strata dip 20° south- 

 eastward. On the surface of these fine-grained beds the only fossils 

 observed were two species of echinoderms. 



These last-mentioned beds appear to be the equivalent of the 

 Lower Limestone of Anguilla, while those containing the recent 

 species of corals, obtained in horizontal strata to the westward, 

 represent the Upper Marls. 



Sombrero is composed of marly white limestone rising to a 

 height of 2b feet above the sea, with its superficial beds irregularly 

 phosphatized. The pockets of this mineral having been extensively 

 worked, its surface is much pitted, so that sections of both marly 

 and more compact limestones are exposed in nearly horizontal 

 strata. The overlying phosphatic rock having been removed, there 

 are occasionally handsome colonies of coral exposed. Among 

 those collected by me the most common forms belong to two 



