THE NAUTILUS. 47 



of South America, which has the operculum and dentition of the 

 TrochidoB. Subsequently Dr. W. H. Rush dredged the same species 

 with a new one, H. circumstriatus Pils., in Maldonado Bay, Uruguay. 

 Dull 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 sabpupoides (Tryon). H. A. P. 



KECENT PUBLICATIONS. 



REVISION OF THE NORTH AMERICAN SLUGS: BINNEYA, HEM- 

 PHILLIA, HESPERARION, PROPHYSAON AND ANADENULUS/ By H. 

 A. Pilsbry and E. G. Vauatta. 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 ccernletim is 

 not especially marked by its genitalia or radula, but differs entirely 

 from the other species of the genus in the external grooves on the 

 body. P. liumile, 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 Ariouidse are divided into three subfamilies, Arioninse, 

 Biuneyinre (which was proposed by the present writer several years 

 ago) and a new one, Ariolimacinse. Eight genera are recognized, 



'Proc. Acad. Nat. Sci. Phila. [June 30], 1898, pp .219-261. Pis. IX-XVI. 



