During my travels in the West Indian Archipelago, 1568— 
69, I made some collections of diatoms among the Virgin 
Islands (Tortola) and also on the shores of St. Bartholomew. 
Ån examination of these gatherings yielded a considerable 
number of forms, of which I give here an enumeration, 
that may serve as a contribution to the history of the geo- 
graphical distribution of these small organisms. In working out 
the following pages I am greatly indebted to Mr. A. GRUNOW 
of Vienna, who kindly assisted me in several cases of 
uncertainty about the correctness of the determinations and 
also allowed me to publish his descriptions and delineations 
of several new and interesting species, found near Campeche 
Bay and probably to be found also in the West Indies. 
1: Navicula Pandura BråB. (A. Schm. Atl. PI. 11 fig. 1. 
Nordsee Diat. Pl. 2 fig. 3) Virgin Ids, not rare. St. Bar- 
tholomew. 
2.1 N. multicostata Grus. (A.> ScHm. At! PI-11 fig. 14— 
20) Virgin Ids. common. Mr. GRUNOW informs me that 
he finds it probable that these two forms are mere varie- 
ties of N. Crabro E. 
3. N. exempta A. ScHm. (Atl. PI. 11 fig. 28—29) Virgin 
Ids. rare. 
45 NI splendida "GrREG: (AA. Schm. Atl: Pl 13 fig. 34) 
Mirgin Ids: rare. 
9. N. diplostieta GRUS. (A. Schm. Atl. PI. 13 fig. 25—30) 
Virgin Ids. rare. 
(OSEEINER Ers Gee jonsi EIRUN. (AR SCR AR ISPR IS SETS AS 
47) Virgin Ids. rare. 
N. gemmatula Grun. (A. Schm. Atl. Pl. 13 fig. 19) Vir- 
gin Ids, rare. 
SIN lacrimansi AA. ScHm. (Alt. Pl 12 fig: 01 Margimn Ids: 
rare. 
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