OPEAS, POLYNESIA. 187 



rather stout, apex obtuse, whorls six, moderately convex, 

 body-whorl high, umbilicus very small, aperture ovate more 

 than one-third the height of the shell, outer lip evenly arched, 

 columella sinuous and reflexed over the umbilical perforation. 

 Alt. 6.8, diam. 2.9 mm. 



Hawaiian Is.: Honolulu (W. H. Rush, type loc.) ; Hilo, 

 Hawaii (McGregor). 



Ope'as opella P. & V., Proc. A. N. S. Phila. for 1905, p. 

 785, fig. 1. 



This species is a little larger and more slender than 0. 

 brevispira Pils. and has the aperture more elongate. It is 

 smaller and more openly umbilicate than 0. semperi Hid. 

 0. hawaiense Sykes is rougher and more slender. (P. & V.). 



I do not feel wholly satisfied that such short forms of Opeas 

 as this one, 0. brevispira and some described Chinese forms, 

 are really valid species. They may be shortened local or in- 

 dividual variations of species ordinarily longer, such as 

 0. mauritianum and 0. clavulinum. A collector on the 

 ground must determine such questions. 



I do not regard 0. opella as a native Hawaiian species. 

 It should be looked for in the East Indies or China. 



