116 THE NAUTILUS. 



described, together with inargiQal notes of allied species, and all the 

 species described since the last edition was published are entered in 

 their proper place as indicated by the author. A new edition of 

 this work is what we need and not any sweeping change in the 

 arrangement of species. 



ON CLEMENTIA SUBDIAPHANA CPR. IN SAN PEDRO BAY. 



BY MRS. BURTON WILLIAMSON. 



To a collector interested in the geographical distribution of shells, 

 the occurrence of species in distinct areas, is full of interest, even 

 though it may modify his preconceived notions regarding defined 

 limits of certain species. 



In Dr. Wm. H. Dall's work, " On some New or Interesting West 

 American Shells," (From Proc. U. S. Nat. Mus., Vol. XIV), he 

 reports the dredging of dementia subdlaphana Cpr., near San 

 Francisco Bay, in 24 fms. The writer says, " the locality whence 

 the specimen was obtained is 600 miles farther south than before 

 reported." The habitat of this species was Vancouver Island and 

 Paget Sound, until Dr. Dall dredged it from Port Etches and south- 

 ward on the Alaskan coast. A small valve of Clementia subdlaph- 

 ana has recently been collected in San Pedro Bay, by Mrs. Laura 

 H. Trowbridge. Mrs. Trowbridge found it on the beach and sent it 

 to me for identification. As nothing like it had been collected in 

 San Pedro Bay, to my knowledge, I sent the interesting specimen to 

 Dr. Dall for determination. He writes ; " looking over some 

 material now on hand, I find young specimens from among my 

 dredgings of 1873 at Catalina Island, and a young one dredged in 

 1890 off Santa Barbara by the Fish Commission, thus fully confirm- 

 ing the extension southward." This extends the species 500 miles 

 farther south. 



DESCRIPTION OF A NEW SPECIES OF BULIMUS. 



BY HENRY A. PILSBRY. 



Placostylus alienus n. sp. 



Shell subcylindrical, with conical spire, very solid, the body- 

 whorl buflf, spire tawny. Whorls 4^, convex. Aperture slightly 

 exceeding half the total length of the shell, somewhat oblique, 

 oblong ovate, whitish inside becoming orange tow'ard the lip ; per- 



