tllE NAUTILUS. 95 



veloped specimens of Vitrea cellaria. A number of specimens were 

 collected and labeled accordingly, and as many have since passed 

 into the hands of friends, it may be well to state, in the interest of 

 those who may not be familiar with the specific characters which 

 differentiate this species from V. draparnaldi., that my identification 

 of these shells was erroneous. 



A recent search among the disintegrating ruins of an old mill in 

 Georgetown, one of the oldest sections of the city, very unexpectedly 

 brought to light specimens of a Vitrea which, notwithstanding its 

 quite close resemblance to draparnaldi, is undoubtedly, I think, cel- 

 laria, although the shells obtained are unusually small and fragile, 

 which is probably due to their out-of-door life. The largest measured 

 only 8.75 mm. greater diameter. Owing to their smaller size and 

 the different color of the animal and shell, I was at once impressed 

 with the belief that I had found two species. A re-examination of 

 specimens was, therefore, necessary, and after carefully comparing 

 my first lot with Mr. Frank C. Baker's description and remarks on 

 V. draparnaldi,^ I was delighted to find that I had discovered this 

 species ; the specimens agreeing exceedingly well with his description 

 in every detail. Dr. Pilsbry and Mr. Geo. H. Clapp, of Pittsburg, 

 Pa., to whom I have sent examples, have kindly verified the identi- 

 fication. 



Being anxious to know if the colony was flourishing, I again vis- 

 ited the nursery on November 3, 1902, and again secured a number 

 of fine specimens, the largest measuring 16 mm. greater diameter. 



This interesting find not only adds another species to the list of 

 the mollusks of the District of Columbia, but another locality, and 

 that a remote one, to the geographical distribution of this handsome 

 introduced species, which seems to be gradually spreading over the 

 United States. As far as I know, this is the first record for this shell 

 east or soutiicast of Chicago, Illinois. 



Washington, D. C, November 15, 1902. 



NOTES AND NEWS. 



Notes on Limn^.a — The recf^ipt of Mr. F. C. Baker's very ex- 

 cellent work on the Molkisca of the Chicago Area suggests a few 

 remarks on Limnsea. It seems unfortunate that American workers 



* Mollusca of the Chicago Area, Pari II ; Chicago Academy of Sciences, April 

 25, 1902. 



