96 
Cowell paid special attention to obtaining living plants and seeds; 
utz obtained a large collection of insects, arachnids, land 
mollusks, and some vertebrates, which enrich the West Indian 
collections of the Museum of Natural History, and studied the 
interrelations of the insects and plants; he also secured many 
hotographs, five of them are reproduced herewith; it fell to Mrs. 
Britton to care for and preserve a large part of the botanical 
collections. 
Arriving at San Juan on February 11, we were met on the wharf 
by Major Basil Hicks Dutcher, M.D. U.S.A., now stationed in 
San Juan, and to his aid much of the success of the expedition is 
due; Major Dutcher’s noteworthy previous field work in mam- 
malogy in various parts of the United States and his participa- 
tion in the exploration of Death Valley made him thoroughly 
acquainted with the needs of a natural history expedition and we 
were most fortunate in having his codperation. Three days were 
spent in San Juan and vicinity and collections were made at 
Santurce, Martin Pefia, Dorado, Candelaria, and Catafio. In 
shallow water on the borders of a marsh between Santurce and 
Martin Pefia, we found the Porto Rican species of the interesting 
fern-relative Marsilia, bearing ripe sporocarps, and these speci- 
mens have made possible the determination of its true biological 
une. which has been in doubt. A small yellow-flowered 
bladderwort (Utricularia obtusa) and a number of other plants of 
interest inhabit this marsh. 
roceeding to Mayaguez by railroad February 15, we were met 
by Mr. W. E. Hess, plant propagator of the Porto Rico Agri- 
cultural Experiment Station. One of the principal objects of 
the trip was the exploration of the botanically and entomologic- 
ally little-known Porto Rican islands Desecheo and Mona, 
situated in the Mona Passage between P@rto Rico and Santo 
Domingo; Mr. Hess had secured the sloop ‘‘Dama” with a crew 
of six for this purpose, and, after outfitting, some collecting, and 
a visit to the plantations of the Experiment Station, including a 
call on Mr. D. W. May, director, the party, reinforced by Mr. 
Hess, through the kind permission of Mr. May, and with the 
exception of Mrs. Britton, who stayed in Mayaguez to preserve 
