86 THE NAUTILUS. 



unchanged in width across tlie back, except that occasionally a few 

 ribs near the spire are interrupted at the median line ; a few short 

 intercalary ribs are usually present on the sides of the shell ; aperture 

 rather wide, armed witii 17 to 18 denticulations on the outer lip, 

 and 14 to 16 on the inner. Two extreme specimens in size measure : 

 length 11.5, breadth 8.6, height 7.2 mm.; length 9.2, breadth, 6..5. 

 height 5.7 mm. 



Catalina Island, 60 fathoms (Cooper) ; Monterey (Dall) ; Cortez 

 Bank, 54 fathoms (Dall) : Catalina Island near Avalon, 40 fatlioms 

 (Sta. 21, U. C. M. B. L.); off San Pedro, about 50 fathoms (Sta. 

 83, U. C. M. B. L.). 



A dead specimen and a fragment of a second, collected more than 

 thirty years ago by Dr. Cooper, as cited above, but wrongly identi- 

 fied as Trivia sanguinea Gray, are now in the museum of the Uni- 

 versity of California. If the admission of T. sanguinea to the Cali- 

 frrnian fauna rests solely upon this identification, the name should 

 be removed from our lists. See Cooper's Geographical Catalogue of 

 the Mollusca Found West of the Rocky Mountains, 1867, No. 626. 



To Dr. Dall is owing the citation of localities which considerably 

 extend the known range of T. ritteri. A specimen was submitted by 

 Dr. Dall to Mr. J. Cosmo Melvill, of Manchester, England, wlio 

 considered it new after comparison with T. rnvltilirata, europsea, 

 candidula, pelhicidula, etc. In the character of the ribs it somewhat 

 resembles T. buttoni Melv., but dift'ers in color, being white instead 

 of straw-colored, in having about twenty instead of fourteen ribs, and 

 in its size, the latter species being 5.5 mm. in length. T. ritteri 

 differs from T. europcp.a in the ribs, which in the former species are 

 less numerous, sharp, and much narrower than the interspaces, while 

 in the latter they are more rounded and wider. The shell of the 

 latter is also more inflated. From T. panamensls Dall, the present 

 species ditFers in much greater size and more numerous ribs. It 

 gives me great pleasure to dedicate this beautiful species to Professor 

 William E. Ritter, in charge of the University of California Marine 

 Biological Laboratory at San Pedro, 1901. 



ANNIE M. LAW. 



For much of our knowledge of the mollusk fauna of east Tennes- 

 see and western North Carolina we are indebted to two ladies. Miss 



