Bartsch — Critical Remarks on Philippine Landshells. 19 



more nearly circular. The present subspecies appears to occupy the lower 

 Rio Grande Valley of Cotabato, Mindanao. 



The type, Cat. No. 250,787, U. S. N. M., and a large series of additional 

 specimens were collected by Dr. E. A. Mearns near the town of Cotabato. 



Leptopoma goniostoma goniostoma comes from Misamis Province, on the 

 north coast of Mindanao. 



Leptopoma nitidum weeksi, new subspecies. 



In September, 1918, I published in the Journal of the Washington 

 Academy of Sciences a key to the subspecies of Leptopoma nitidum Sowerby 

 of the Philippine Islands. The present subspecies is nearest related to 

 the subspecies which I there called Leptopoma nitidum anaitis Bartsch. 

 This differs from it in being more broadly conic and larger, likewise in 

 having the spiral striations of the upper surface and the base more num- 

 erous and a little more closely crowded. Thirty-six specimens give the 

 following average measurements altitude, 14.2 mm.; greater diameter, 

 13.9 mm., lesser diameter, 10.5 mm. 



The type, Cat. No. 310,073, U. S. N. M., which comes from the Island 

 of Bohol, measures: altitude, 14.1 mm.; greater diameter, 13.9 mm.; lesser 

 diameter, 10.7 mm. 



