THE NAUTILUS. 47 
of South America, which has the operculum and dentition of the 
Trochide. Subsequently Dr. W. H. Rush dredged the same species 
with a new one, H. circumstriutus Pils., in Maldonado Bay, Uruguay. 
Dall has referred the Californian Fenella pupoidea of Carpenter to 
Halistylus ; quite correctly, as it closely resembles the South Atlantic 
species in operculum and shell contour. There was, however, an 
earlier Fenella pupoides of A. Adams, which was ruled by Tryon 
to preoccupy Carpenter’s name; so that the West Coast species 
should be called Halistylus subpupoides (Tryon).—H. A. P. 
RECENT PUBLICATIONS. 
REVISION OF THE NorTH AMERICAN Siucs: BINNEYA, HEm- 
PHILLIA, HESPERARION, PROPHYSAON AND ANADENULUS.’ By H. 
A. Pilsbry and E. G. Vanatta—This admirable paper contains so 
much that is new and interesting that one can only recommend the 
malacologist to read it for himself. No mere abstract would do it 
justice. The whole subject is newly presented so as to bring out 
clearly the generic and specific characters, and while the work is 
complete up to date, it is full of suggestions for further investigation, 
so that the reader is stimulated as well as instructed. 
The authors excellently insist at the very beginning, that ‘all 
the facts of morphology should be taken into account in systematic 
classification,” and “ those who starve their souls on a mere study of 
the genitalia and oral armature miss the best part of the feast.” 
This is very well shown in what follows. Prophysaon cerulewin is 
not especially marked by its genitalia or raduia, but differs entirely 
from the other species of the genus in the external grooves on the 
body. P. humile, on the other hand, has the grooves much as in 
the other forms, but differs greatly in the color-markings and geni- 
talia. P. foliolatum, again, has a good specific character in the 
radula. Thus the species of Prophysaon could not be well elucidated 
without examining all their characters, for the specific peculiarities 
do not reside in the same organs throughout the series. 
The Arionidze are divided into three subfamilies, Arionine, 
Binneyinz (which was proposed by the present writer several years 
ago) and a new one, Ariolimacine. Eight genera are recognized, 
‘Proc. Acad. Nat. Sci. Phila. [June 30], 1898, pp .219-261. Pls. IX-XVI. 
