136 



THE NAUTILUS. 



No figure was given with Lamarck's description of 0. irisans, 

 but a figure probably intended for the same 

 shell appears in Reeve's " Conchologia Iconica," 

 Vol. 6, PI. 6, fig. 8a, where it is classed with 

 typical 0. irisans Lam. That this figure does 

 not agree with Lamarck's description in any 

 essential features is quite apparent. 



It seems, however, to have been accepted by 

 my late friend, Mr. Tryon, as well as by Reeve, 

 for a form of (), irisans, since it was copied for 

 the " Manual" without remark ; although sev- 

 eral specimens exhibiting characters similar to 

 those shown in the figure — but which belong to 

 0. cryptos'pira only — were at the time in the 

 Academy's collection. AVhether these specimens 

 were accidentally overlooked, or the distinctions 

 noted deemed too trifling for special designation, 

 is a question that cannot now be answered. 



In consequence of this uncertainty, the responsibility of correcting 

 the error of classing this form with 0. irisans, (if 

 error it be), is accepted rather reluctantly al- 

 though in the firm belief that the change will ben- 

 efit the student, as well as, in some slight degree, 

 the cause of Science, also. 



WESTERN PENNSYLVANIA SHELLS. 



BY E. H. HARN, BLAIRSVILLE, PA. 



The following is a list of species which I have collected in West- 

 ern Pennsylvania. It may be of interest for the sake of locality : 



Selenites concavus Say. 

 Zonites fuliginosus Griff. 

 Zonites laevigatus Pfr. 

 Zonites ligerus Say. 

 Zonites intertextus Binn. 

 Zonites inornatus Say. 

 Zonites nitidus Miill. 

 Zonites arboreus Say. 



Pupa armifera Say. 

 Pupa contracta Say. 

 Ferussacia subcylindrica Linn. 

 Succinea obliqua Say. 

 Succinea avara Say. 

 Succinea Totteniana Lea. 

 Campeloma rufa Hald. 

 Planorbis bicarinata Say. 



