1901.] NATURAL SCIENCES OP PHILADELPHIA. 391 



rious other forms of the Polynesian chlorostoma Sowb. are all 

 markedly shorter shells. The variety of scabrosa figured by Ko- 

 belt (Conchyl. Cab. Tarbinella, PL 23, f. 4, p. 96) may possibly 

 be the same, but it is nameless. 



BUCOINID^E. 



Chrysodomus inter sculp tus var. f rater Pils. PI. XX, fig. 21. 



See p. 197. Type is No. 80,379 Coll. A. N. S. P., from No. 

 59 of Mr. Hirase's collection. 



Buccinum Hirasei n. sp. PL XX, fig. 22. 



Shell solid, turreted, partly covered with an olive-brown cuticle; 

 composed of about 8 whorls, which are convex at the periphery, 

 contracted below, and channeled above; the channel rather wide, 

 flat, bounded by a strongly elevated, slightly uneven carina. 

 Sculpture of faint growth- lines and a few low spiral cords, hardly 

 noticeable on the last whorl. Aperture slightly ovate, angular at 

 the termination of the carina, the basal notch not very deep. 

 Outer lip smooth, not thickened, somewhat expanded. Operculum 

 unknown. 



Length 104, diam. 43, longest axis of aperture 37 mm. 



Kizennuma, Rikuzen (Mr. Y. Hirase, No. 556). 



This magnificent species is known to me by the single specimen 

 figured, which was collected dead. The outer lip is broken above 

 the middle, so that its true outline in that part is not given in the 

 figure. The cuticle has nearly all been lost, and the shell is over- 

 grown with Polyzoa, Spirorbis, etc. 



The conspicuous channel at the suture is formed almost exactly 

 like that of Chrysodomus perieochlion (Schrenk), a species occur- 

 ring with B. Hirasei at Kizennuma. The similarity is so great 

 that I have figured Schrenk' s species for comparison. 



Chrysodomus perieochlion (Schrenk). PI. XX, fig. 23. 



The specimen here figured is longer and less inflated than the 

 original type of the species as figured by Schrenk. The dark 

 olive cuticle, wanting from the base of the shell, resembles that 

 of Buceinum Hirasei, and reminds one of the cuticle of such fresh- 

 water snails as Viviparus or Campeloma. 



