THE NAUTILUS. 79 



sian Gulf, where the shells are of the same size but greater in 

 weight. The dorsal surface of the Persian Gulf examples I find 

 white and the coloring also somewhat lighter. 



Turritella columnaris Kien. 



Mitrularia eguestris L. var. tortillis Reeve. 



StrombiLS columba Lam. Tryon when writing the Manual was 

 uncertain as to the presence of this species in the Red Sea. Shop- 

 land's report and the present record confirm the presence of the 

 species in these waters. 



Strombvs gibherulus L. 



Strombus mauritianus Lam. Tryon and Paetal cite Mauritius as 

 the home of this Strombus. 1 doubt if it was collected so far north. 



Strombus variabilis Swains. 



Rostellaria curvirostra Lam. A young specimen is of interest. 

 There are 14 whorls present. The embryonic whorl is pearly, the 

 following 10^ whorls covered with the longitudinal plications, the 

 remaining whorls smooth except the lower portion of the body whorl 

 which is ornamented with spiral lines. The opercula of an adult is 

 twisted and the under surface raised in the center. 



Bullaria ampulla L. 



Hydatina physis L. 



Utnbraculum indicutn Lam. 



NOTE ON A VARIETY OF POLYGYRA FALLAX. 



BY H. A. PILSBKY. 



The group Triodopsis in States of the Atlantic slope presents 

 numerous forms which by their variations perplex the conchologist. 

 Polygyra ( Triodopsis') hopetonensis (Shuttlw.) in its various varieties 

 is a widely-spread species. The variety obsoleta from Newbei"n, 

 N. C, probably belongs to it, but it needs further investigation with 

 more specimens. 



Polygyra vannostrandi (Bid.) is distinct by its closely coiled 

 whorls, but the aperture is like that of P. fallax, both having large 

 teeth, the basal tooth inclined to be double and the outer lip-tooth 

 wide and deep-seated. The two species are not always easy to tell 



