34 THE NAUTILUS. 



which I placed one. The types of this shell are in my own collec- 

 tion and the Boston Society of Natural History. Other collectors, 

 however, have specimens, as I have sent out many sets. 

 {To be Continued.) 



NOTES. 



Natica ixtricatoides Hid. ox the Algerian Coast. — Last 

 year I mentioned Naticu prietoi Hidalgo, as found by myself at 

 Algiers. Like Natica intricatoides, another very rare species from 

 the Spanish coast, it had not been found before on our shores ; now 

 Natica intricatoides has been detected also at Algiers by the General 

 de Lamothe, the well-known geologist, who gave me several beauti- 

 ful specimens. It was associated with N.filosa, N. macilenta and 

 N. prietoi ; of the latter he found a single specimen. In the same 

 lot from Sidi-Ferruch in the vicinity of Algiers, I saw a single and 

 very fine Nassa, in fair condition, which may be N. compta A. Ad., 

 known only as a West African shell. — C. F. Axcey. 



Planorbis alabamexsis and DILATATUS IX the Floridiax 

 Pliocexe — The only small Planorbis reported from the Caloosa- 

 hatchee Pliocene in Dall's great work on that fauna is P. exacutus 

 Say. Some years ago I received from Mr. Johnson numerous 

 specimens of another species, P. alabamensis Pils. They differ con- 

 stantly from the recent form in having a decidedly smaller umbili- 

 cus. This variety may be called P. alabamensis avus. With these 

 there were a few specimens of P. dilatatus Gld., which also differ a 

 little from the typical form in having a smaller aperture and dis- 

 tinctly thickened lip. — H. A. Pilsbrt. 



Note ox Caxadiax Unio luteolus. — While examining re- 

 cently the shells in the collection presented to the Smithsonian Insti- 

 tution by Dr. Isaac Lea, I was surprised to observe that a large 

 green specimen of Unio luteolus, from the " Rideau Canal, Ottawa, 

 Canada," had written upon one of its valves in his well-known hand- 

 writing the name " U. radiatus." The entry number of the shell is 

 85042. The error would not be remarkable if made by an authority 

 of less repute than Dr. Lea, as many of the male luteolus found in the 

 Rideau Canal resemble radiatus in outline, coloring and even in the 



