56 THE NAUTILUS. 
A second trip in the winter of 1904 through Mississippi and 
to the Mussel Shoals of the Tennessee River resulted in the dis- 
covery of several additional species of Somatogyrus ; the first 
living specimens of Pyrgulopsis mississippiensis C. and P. and a 
fine species of Campeloma that subsequently served to differenti- 
ate the C. coarctata of Binney from the original coarctata of Lea 
and establish the validity of C. lewisit Walker, which was typi- 
cally based upon specimens collected by him in the Vallabusha 
River, Miss. 
In the winter of 1906-7 he made his first expedition to Mex- 
ico and in 1908 a second trip. His collections on these jour- 
neys developed the remarkable Melanian and Unione fauna of 
the Panuco River system. Two new genera, Pterides Pils., 
Lithasiopsis Pils., a new subgenus Emmericiella Pils., and a great 
number of new species of both land and fresh-water shells were 
added to the Mexican fauna. 
In 1912 he made his first expedition to Guatemala, a second 
trip in 1913 anda third in 1917. These resulted in large series 
of many of the rarer species of that region and the addition of 
many new species of both land and fresh-water forms to science. 
The material brought back by him from his last trip has not 
yet been completely worked up and it is probable that the num- 
ber of new species will be largely increased when that work is 
completed. 
The sickness and death of Mr. Hinkley’s wife in 1915 and 
his own subsequent ill health kept him at home in that year 
and also in 1916 and 1918. 
In the early part of January, 1919, he joined Messrs. Ferriss 
and Camp in a long trip ‘‘along the Mexican border’’ which 
continued until May and has been written up by Ferriss in the 
NavTiLus (X XXIII, p. 37). On this expedition he paid special 
attention to the collection of the minute and fluviatile species. 
Only a very few of the many new species collected on this trip. 
have, as yet, been published. 
In the early summer of that year he madea short trip through 
western Tennessee and Kentucky and planned a thorough ex- 
ploration of the Duck River, but unfortunately the project was 
cut short. 
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