128 Tne Americaii Geologist. August, mm 
doimis and Allerisnia. Thirteen species are described, nearly all from 
the lower Devonian, a striking contrast to the American occurrence of 
such typical forms, which are almost exclusively from middle or upper 
Devonian faunas. 
Allerisma, King (emended spelling). This still remains a somewhat 
unsatisfactory receptacle for species whose true relations will be better 
understood when the typical Permian species of the genus shall have 
been more fully investigated. With more abundant material the author 
must have more keenly appreciated the very slight interval between 
some of these shells, such as A. munsteri and A. priscum (which are 
embraced within Hall's conception of Gramviysia), and the true 
Grammysias. 
Leptodovnis, McCoy. This was an ill-defined genus and it is not quite 
clear that the author's original intention is followed in referring to it 
shells of the type of Gh'ammysia ccmsMcta, G. comviunis and G. itndata 
Hall. The distinction between these many forms called Grainmysia, 
AUen'sma and Lej^todovuis is not particularly elucidated by the employ- 
ment of diverse terms in preference to the practice of Hall to include all 
under the term Gramviysia. 
Pholadellu, Hall. Represented by a sing\e s\)GQ.\es, P. peregrina, from 
the lower Devonian. 
Cardiomorpha, de Koninck. The author's conception of this genus 
would include within it again certain forms embraced in Hall's concep- 
tion of Graiiimysia, such as those constituting his division obsoleta. 
Edniondia, de Koninck. 1 sp. 
Glossites, Hall. 1 sp. 
Phthonia, Hall. 1 doubtful sp. 
Family Solenomyidaj. Jaiieia, King. This heretofore little know^n 
genus is emended as to include shells having the aspect of recent Sole- 
nomya with narrow, extended anterior extremity, straight, toothless 
hinge and internal ligament. As present constituted it will cover many 
Devonian and later species whose generic traits lack distinctive em- 
phasis. 
Family Antipleuridae. Dualina, Barr. A doubtful sp. 
Silurina, Barr. 1 sp. 
Family Cardiolida^. Prcecardium, Barr. It is claimed that, in accord- 
ance with Neumayr's observation, this genus is edeutulate. There is a 
triangular area beneath the beaks, the inner margin of which is crenu- 
lated by the ends of radial ridgelets. The species are all upper Devo- 
nian as in New York, and the rare form, P. retiistum, Hall, is identified 
with Kayser's Cardiola (P.) nehdenensis. 
Reghia, Barr. The recognized difference between thefe forms and 
those which have been referred to Pnella (Pcmenka) is in the promi- 
nence of certain of the radial ribs. There seems to be no evidence of 
hinge or of the subcardinal area characterizing most of the Cardiolid*. 
Piiella {Panenka), Barr. 8 sp. Lower — lower upper Devonian. 
Euthydesma, Hall. This is for the first time and with undoubted 
correctness placed with the pala30conchs. The only species is E. Bey- 
richi of the lower upper Devonian. 
