Bland.] 08 [March 3, 
Considering the facts of distribution already given, and the above 
mentioned soundings, it seems highly probable that very deep water will 
be found between the Anguilla and Antigua banks. 
In this connection it is interesting to notice that the depth of the sea is 
1,376 fathoms (8,256 fect) between Cuba and Jamaica, in N. Lat. 18° 36/, 
W. Long. 76° 03/, a somewhat near approximation to the Latitude of the 
great depth between the Virgin bank (St. Thomas) and Saba. 
The fauna of St. Croix is closely allied to that of Puerto Rico, and seeing 
the depth of water between them, it is a significant fact that Caracolla 
(Helix), caracolla L. one of the characteristic species of the latter, is 
found subfossil only, with other extinct species, and among thema Strophia, 
in the former. Megalomastoma, Aleadia, and Mucroceramus do not exist 
in St. Croix, while there is one species of Oylindrella. With further 
reference to the soundings, the Latitude of Jamaica, and the nature of 
the fauna of St. Croix, I should mention that Megalomastoma and Strophia 
have none, and Macroceramus one representative (a Cuban species) in 
Jamaica, in which Island there are, however, 14 species of Alcudia and 
51 of Cylindrella. Sombrero has one living species (Chondropoma Julient 
Pf.) which is also found, with a Strophia, embedded in the phosphatic 
limestones of that Island, 
Professor Cope lately referred to me, for determination, shells from the 
matrix between the femoral condyles of Lozomylus latidens, Cope, one of 
the great extinct Rodents, the bones of which have been found in the 
caves of Anguilla. The shells are closely allied to Tudora pupaeformis, 
Sow, now living on Anguilla, and apparently identical with an unde- 
termined species which inhabits St. Martin. 
Sxcrion V.—Subdivision 1. Islands on the St. Christopher and Antiqua 
banks, Montserrat, Guadeloupe, Dominica, Martinique, and Barbado 
Subdivision 2. St. Lucia, St. Vincent, Grenada and the Grenadines, To- 
bago, and Trinidad. 
In former papers I did not treat the fauna of the Islands in this section 
as capable of subdivision, but with my present increased knowledge must 
necessarily do so. 
Immediately to the south of the Anguilla bank there is, to the eastward, 
@ bank on which stand Barbuda and Antigua, and to the westward, another 
(separated from the adjacent Islands by channels of a greater depth than 
200 fathoms, 1,200 feet), which constitutes the base of St. Eustatius, St. 
Christopher, and Nevis. At a short distance from the northern end of 
the latter bank stands Saba (about 24 miles in diameter,) rising perpen- 
dicularly from the sea to the height of 2,820 feet, with the 100 fathoms 
(600 feet) line of soundings about half a mile from its western, and a little 
‘more than half that distance from its easternside. ‘Late soundings between 
St. Eustatius and Saba (Lat. 17° 31/10’, Long. 63° 08/ 30’) give a depth 
of 343 fathoms (2,058 feet). 
* T omit mention of several small Islands geographically belongingto those enumerated in both 
subdivisions, 
