PHILIPPINE LAND MOLLUSKS OF GENUS OPISTHOPOE US 327 



Type.— U.S.'N.M. No. 313013, from Turturingan, Palawan. It has 

 4.3 whorls, and measures: Height, 7 mm; greater diameter, 15.1 mm; 

 lesser diameter, 11 mm. The operculum measures: Thickness, 0.6 

 mm; diameter. 4.7 mm. A topotype, U.S.N.M. No. 313014, has 4.3 

 whorls, and measures: Height, 0.4 mm: greater diameter. 13.'.) mm: 

 lesser diameter. 10.6 mm. 



Remarks. — This species is nearest in size to typical O pisthoporus 

 quadrasi qioadrasi, but differs from this by the absence of figura- 

 tions and in having much stronger axial and spiral sculpture. 



OPISTHOPORUS QUADRASI, subspecies ? 



Plate SI, Figure 1 



U.S.N.M. No. 130872 contains three specimens said to have been 

 collected by Osborn on the island of Panay. These seem so far out 

 of the regular range of distribution that I refrain from commenting 

 upon them further than to say that they resemble quite closely the 

 shells here described as Opisthoporus </ii(i<lr<ixi paldwanensis. It 

 is possible that specimens may have been transferred with cultural 

 plants, as in the case of Opisthoporus hlciliatus Mousson. 



OPISTHOPORUS QUADRASI, subspecies ? 



Plate 81, Figure 6 



U.S.N.M. No. 201071a contains the specimen that I have here fig- 

 ured from Palo Leyte. It was donated to the National Museum by 

 Walter F. Webb. 



The remarks under the last apply here as well. 



o 



