‘9 Bel 
q : 
ag 
oF 
ts 
THE AMERICAN MIDLAND NATURALIST 43 
Eur. (M.) brevicula (Call), T. Curtisit Frierson and Utterback, 
and 7. Lefevret Utterback. Aside from the morphological synopsis 
of the nutritive and reproductive parts and also of the external 
and internal features of the shell the physiological and ecological 
facts are especially dwelt upon in the miscellaneous remarks. 
Because of the value of beak sculpture and glochidial characters 
as bases for classification a special feature is respectively made 
of the studies of juveniles and glochidia. I,ikewise, for classi- 
ficatory reasons, a Breeding Record has been kept for the most 
representative generic types, and, in many instances, more 
complete records have been made by other observers due to more 
detailed observations during the winter season. This Record 
and also the Zodgeographic account of the Missouri Natades 
have been carefully kept in tabulated form, but, as these accounts 
have been reserved thus for other special papers, they will only 
appear here in extracts. 
In this catalogue eighty species and twenty stbspecies are 
listed. Doubtless this list will be supplemented, although the 
author has worked the State rather thoroughly in actual field 
investigations—especially Central and Northwest Missouri— 
and has examined all species catalogued except the following 
which have been reported by Missouri collectors:—An. Bealit 
(ea). Cy. Aberti lamarckiana (I,ea), Pleu. plenum (Lea), Lamp. 
reeviana (Lea) and Lamp. Powellit (lea). According to a report 
from the material sent away for identification, this State can claim 
another species not yet on the list,—a new and undescribed 
Lampsilis, near to Lamp. biangulata (Lea), and will soon appear 
under the authorship of Mr. Frierson. 
The author wishes to express his thanks to those who have 
assisted him in this work. Especially is he thankful to Dr. George 
Lefevre who assigned and directed this work and rendered it 
possible through his numerous kindnesses and_ suggestions. 
Much credit should also be given Dr. W.C. Curtis, the co-worker 
with Dr. Lefevre, in the University of Missouri, Department of 
Zodlogy, where the author gathered much of his data through 
the facilities of the laboratory, library and museum. Besides 
the invaluable instructions received from these two gentlemen, 
who have contributed so much to the Science of Fresh-water 
Mussels, it was the author’s pleasure to receive many valuable 
hints in person from Dr. R. E. Scammon, author of ‘“‘ Kansas 
