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. lewisi 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 and a 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 

 NAUTILUS (XXXIII, 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 made a short trip through 

 western Tennessee and Kentucky and planned a thorough ex- 

 ploration of the Duck River, but unfortunately the project was 

 cut short. 



