THE NAUTILUS. 
43 
figured or sufficiently described to enable it to be referred to its 
proper place in the family. 
Lutraria Sieboldii Deslu, 1854; “Vancouver Id., Kellett”; is a 
Japanese species, with which L. lucida Gld., 1861, (a young 
shell) is probably synonymous. 
Darina declivis Cpr., 1865, has not been found by any collector on 
the N. W. coast since reported from a collection alleged to 
have been made by Dr. Forbes, R. N., but which had passed 
through the hands of a dealer. The same lot contained a 
shell described by Dr. Carpenter under the name of Saxidomus 
brevisiphonatus, which also has not subsequently been discover¬ 
ed in the region. 
[Errata. July Nautilus at foot of p. 28, should read: Mactra 
Cumincjiana “Bush,” Zool. Rec., 1885, from Cape Hatteras, is a 
lapsus of the Recorder for Madia Cumingiana .] 
April 15, 1894. 
A FEW NOTES ON HELIX TRIDENTATA. 
BY A. G. WETHERBY. 
I have recently received from Mr. Pilsbry his Critical List of 
Mollusks collected in the Potomac Valley. Proc. Acad. Sci., Phila., 
1894, pp. 11 to 31, with plate. 
This is a valuable and interesting contribution from this inde¬ 
fatigable worker. But he has again dropped into the business of 
adding latin names to varieties of our common shells, so that we 
now have from Say’s species no less than three trinominal relations, 
viz., H. tridentata edentilabris; H. tridentata juxtidens and H. tri- 
dentata frandulenta. I propose, in this note, to briefly review this 
case, as Mr. Pilsbry, having the spirit of the true naturalist, has 
kindly opened his pages for that purpose. 
This species, though exhibiting so many variations, due to differ¬ 
ences of station, or to inherited race proclivities, has always a gen¬ 
eral facies that marks it well. No student of our land shells need 
ever or does ever, mistake it for anything else. It cannot be con¬ 
founded with H.fallax Say, though Dr. Binney believed them to be 
identical; nor is there any other North American species, worth any¬ 
thing as such, that need be taken for it. Now with this fact well 
