1883.| Note on the Genus Campeloma of Rafinesque. 603 
Truckee group, including a new form [Zatia dallii], pp. 99-101 
late v; “Fossils of the Indiana rocks, No. 2,” Eleventh annual 
report of the Indiana Geological Survey, pp. 347-401, Plates 
37-55. Four new species are described in this work, but it is 
mainly a republication of forms more or less well known. Seven 
new plates were prepared expressly for this work, but the remain- 
ing twelve plates are made up of figures which were engraved 
over twenty-five years ago by John W. Van Cleve to accompany 
a work on fossil corals, which he did not live to accomplish. 
= 
NOTE ON THE GENUS CAMPELOMA OF 
RAFINESQUE. 
BY R. ELLSWORTH CALI.. 
ge earliest known forms of this subgenus of the great mol- 
luscan family Viviparidæ appears to have been described by 
Thomas Say as a Limnæa,! the type of the group being the form 
now common in collections under the name of decisa. The form 
on which the description was based is illustrated by Fig. 6, on 
Plate 111, and is reproduced as Fig. 13 by W. G. Binney in his 
monograph of this family published as Smithsonian Miscellane- 
ous Collections, No. 144. In a subsequent corrected edition of 
the Encyclopædia the same form and plate appear, bearing how- 
ever the name of Paludina decisa Say. This reference is the first 
in which any of the forms of this group are referred to Paludina, 
a subgenus not represented in North America so far as known. 
In several instances European malacologists appear to have con- 
founded these American forms with different exotic subgenera. 
They have been referred by these foreign systematizers variously 
to Ampullaria,? Melania’ Helix Cochlea’ and Melantho. Mr. 
W. G. Binney appears to be the first among American authors to 
employ the name of Melantho for these mollusks, though in this he 
followed the unpublished work of Dr. William Stimpson.’ It is 
! Nicholson’s Encyclopædia, ed. 1, 1817, and ed. 2, 1818. 
oo Encyc. Meth., Tome 11, p. 32. 
ea Syn. Meth., p. 134. ; 
o o 2d Supplement, p. 226. (Hauley’s ed., 1856.) : G. Binney 
Cae Conchyliologie, Tome 127. Quoted on the authority of 'W.G. 7 
: — of personal verification. ie 
ace to Smithsonian Misc. Coll., No. 144, p. Ul 
