About 275 hitherto undescribed forms have thus been obtained 
and immature stages of about 225 species have been accurately 
identified. 
MOLLUSCAN COLLECTIONS AND DETERMINATIONS. 
The Station collections of mollusks, made mostly by Mr. 
Hart, contain about 11,000 specimens, 600 of which are clams 
(Unionidae). All this material except that most recently brought 
in has been examined and determined by various American 
specialists. About eighty-five names of aquatic or semi-aquatic 
mollusks have thus been obtained, and their distribution and life 
history have received special attention. The Unionidae have 
been studied with reference to characters derived from the entire 
animal, and much interesting information has been accumulated 
concerning their relationships, life histories, and parasites. 
FRESH-WATER WORMS. 
The greater part of the time of Professor Smith available 
for State Laboratory work has been devoted to a study of the 
oligocliaete worms (earthworms and their allies) found in and 
about the Illinois River and other waters near Havana. Most 
of this work has necessarily been of a systematic character, 
although progress has been made along other lines. The im¬ 
portance of systematic work on this order is shown by the fact 
that with the exception of descriptions of two species published 
in Yol. III. of the Bulletin of the State Laboratory,* almost 
nothing has been known of the representatives of the group in 
the Mississippi Valley and but little, indeed, for all the eastern 
part of the United States. 
Collections have been made from all the regular substations 
and at various places in the bottom-lands and along the shores 
of the river to a point two miles south of Havana. Many of the 
worms obtained were studied while living, and for further study 
about seventy bottles of specimens have been prepared and pre¬ 
served in alcohol or formalin. For a successful study of most 
of these worms serial sections are indispensable, and thus far 
about 400 microscopical slides of such sections have been made 
and used. 
* Art. IV. “On the Anatomy and Histology of a New Earthworm (Diplocardia com¬ 
munis), gen. et sp. nov.. by H. Garman; and Art. VII., “On an American Earthworm of 
the Family Phreoryctidee,” by S. A. Forbes. 
