24 
The work of identification is now nearly completed and 
probably nearly all of the different species occurring in the 
region are represented on our lists. Of the thirteen families 
of Oligocbaeta recognized by Beddard, nine are represented at 
Havana by thirty species belonging to sixteen genera. Less 
than one half of these species occur in Europe and the remain¬ 
der, with few exceptions, are known only from the United States. 
Two new genera and at least seven new species have thus far 
been found by us. 
Numerous experiments have been made in rearing naidi- 
form worms and considerable new information has thus been 
acquired concerning their asexual reproduction. 
Identification and description of the planarian worms of 
the Station collections has been kindly undertaken for us by 
Hr. W. M. Woodworth, of Harvard University, to whom all our 
material lias been sent, much of it alive. The work on these 
collections lias all been done and Hr. Woodworth’s paper is 
nearly ready for publication. 
STUDIES OF PROTOZOA AND ROTIFERA. 
These minute animal forms of the Station fauna have been 
very patiently and thoroughly worked out from day to day for 
nearly two years by Mr. Adolph Hempel. As most of them 
could not be studied to advantage except in a living state, they 
have been determined as fast as collected. More than five 
hundred collections have thus been critically overhauled, and 
annotated lists of species and descriptions of new forms have 
been prepared and either published or made ready for publica¬ 
tion in the Bulletin of the State Laboratory of Natural History. 
102 species of Rotifera (three new) and 80 species of Protozoa 
(five new) have thus been listed from our situation by Mr. Hem- 
pel, and several others have been identified by Hr. Ivofoid in the 
course of his studies of the plankton since Mr. Hempel’s work 
was suspended as a consequence of injury to his eyes. Among 
these later acquisitions was one of the most remarkable and 
important rotifers known to science, a species of the genus 
Trochosphcera , which is famous in the annals of zoology for 
the light which it throws upon the zoological relationships of 
the Rotifera at large. This genus, founded on a species dis¬ 
covered by Professor Semper in 1872 in pools in the rice fields 
