FEB., 1910. Two NEW PULMONATE MOLLUSKS DALL. 219 



Neritina pulligera Linne. 



Two specimens from eighteen miles north of Cape St. George, 

 New Ireland. 



Barbatia sp. indet. 



One worn valve from Anair Island near New Ireland. 



Asaphis deflorata Linne". 



One young valve with the preceding. 



Tellina scobinata Linne". 



One valve from-Namatanai, New Ireland. 



DESCRIPTIONS OF THE NEW SPECIES 



Placostylus (Leucocharis) dorseyi n. sp. Plate IV, figure i. 



Type No. 11254, F. M. N. H.; Anair Island, Solomon Islands. 



Shell small, thin, pale straw-color over a subtranslucent basis, 

 with about five whorls; apex as usual in the group, the punctate 

 nepionic shell of about three quarters of a whorl, glassy, the sculpture 

 abruptly changing to fine, sharp, moderately close spiral striae which 

 cover the rest of the shell, being more or less interrupted by the lines 

 of growth and more sparsely distributed toward the periphery of the 

 whorls; spire subacute, the whorls slightly rounded, somewhat 

 attenuated, with an ample umbilical pit half covered by the reflexed 

 pillar; aperture elongate-ovate, the margin thin, sharp, distinctly 

 reflected ; pillar not twisted nor thickened ; body with a thin trans- 

 parent glaze, the outer lip slightly ascending at the posterior com- 

 missure. 



Length of shell 20.0; of last whorl 14.0; of aperture 10.0; max. 

 diameter 10.5 mm. 



A single specimen was collected at Anair Island near New Ire- 

 land, Solomon Islands, by Mr. G. A. Dorsey, after whom the species 

 is named. The only species I find described which is at all compar- 

 able with P. dorseyi is the P. pancheri Crosse, from New Caledonia, 

 which is nearly twice as large and has a brown columella except in 

 the white variety Candida from the same locality. 



This is by far the smallest and most delicate species of Placostylus 

 known and presents a remarkable contrast to the large coarse forms 

 which make up the mass of the genus. 



