GEMMULA. 173 



P. DIFFICILIS, Smith. PL 32, fig. 16. 



About ten rather coarse spiral line on the last whorl^ the 

 sinus above the submedian liration; brownish horn-color. 

 Length, 7 mill. 



Japan. 

 Subgenus GEMMULA, Weinkauff. 



P. SPECIOSA, Reeve. PI. 4, fig. 48. 



Shell crenulately carinate or ribbed, the principal carina, 

 forming the angle of the whorls, corded, with a sloping shoulder 

 above it ; yellowish white, the ribs ochraceous. 



L. 47, diam. 18 mill. 



China. 

 P. CARINATA, Gray. PI. 4, fig. 49. 



Shell closety encircled by sharp ribs and intermediate striae, 

 the slit-band a pair of beaded ribs ; suture channeled ; yellowish 

 white, chestnut-spotted on the ribs ; fissure wide and deep. 



L. 65, diam. 20 mill. 



Habitat unknown. 



P. Kieneri. Doumet, is a S3monym. 



P. GR^FFEI, Weinkauff. PL 4, fig. 50. 



Shell brownish, crenulately carinate or cingulate, the ribs 

 lighter-colored, the median carina stronger, with larger crenula- 

 tions ; aperture plicate within. L. 20, diam. 6 mill. 



Viti Islands. 

 Doubtfully distinct from the next species. 



P. GEMMATA, Hinds. PL 4, figs. 51, 54. 



Shell more slender than the preceding species, with a more 

 prominent noduled keel, and spiral lirulse ; yellowish brown, 

 the keel usually white, sometimes indistinctly brown-banded 

 above and below it. L. 26, diam. 7'5 mill. 



Eed Sea, Japan, Australia (Brazier), 



Viti Islands (Garrett). 



Hinds' locality, Magdalena Bay, Lower California, has not 

 been confirmed. P. monilifera, Pease (fig. 52), is perhaps 

 somewhat stouter, with shorter spire and canal in the examples 

 figured by Weinkauff, but from those before me I am convinced 

 that it passes into the typical gemmata. 



P. fusca, Hombron et Jacq. (fig. 53), although figured as of a 



