388 Trans. Acad. Sci. of St. Louis. 



Subgenus Stramonita Schum. 

 Purpura haemastoma Linne\ 



Purpura hcemastotna Linn., Syst. Nat., XII, p. 1202. 



Purpura Trinidadensis Guppy (Proc. Sci. Ass. Trinidad, 

 1869) is said by Dr. W.'H. Dall to be a variety of haemas- 

 toma. Purpura oceanica Locard (Ann. Soc. Linn. Lyon., 

 XXXII, p. 216, 1885) is a synonym of typical haemastoma. 



Subgenus Polytropa Swainson. 

 Purpura lapillus Linne. 



Purpura lapillus Linn., Syst. Nat., XII., p. 1202. 



Purpura celtica Locard (Agric. Soc. Lyons, p. 558, 1886) 

 is a synonym of lapillus. This prolific form probably has as 

 numerous a synonymy as any existing species. 



Purpura scobina Quoy. 



Purpura scoUna Quoy, Voy. Astrol., II., pi. XXXVIIL, figs. 12, 13. 

 « Purpura biconica Hutton is said by its authors to = tristis 

 Dunker (= scobina). Vide letter to Mr. G. W. Tryon, Jr. 

 (1882). 



Purpura exilis Dunker. 



Purpura exilis Dunker, Mai. Bliltt., XVIII., p. 154, 1871. 

 This species was said by Mr. Garrett, in a letter to Mr. 

 Tryon, to = Baphnella tricarinaia Val. 



Purpura cheesemani Hutton. 



Polytropa cheesemani Hutton, Trans. New Zealand Institute, p. 131, 1882. 



The writer recently had the pleasure of examining a dozen 

 fine specimens of this species, and there is no question con- 

 cerning its validity. It is a small species (about half an inch 

 in length) and may at once be knowu by its white shell en- 

 circled by five spiral ribs, with the ribs broad and smooth and 

 the grooves narrow and transversely lirated. The interior of 

 the aperture is bright purple. It is allied to Purpura pro- 

 pinqua Tenison- Woods, but the grooves in that species are 

 much narrower. The species was originally collected at Port 

 Waikato, New Zealand. 



