OPEAS GRACILE. 125 



been introduced by commerce. I believe this to be the case 

 in the Mascarene and Hawaiian groups, where the following 

 species have been found: 



Mauritius. Hawaiian Is. 



0. gracile. 0. oparanum. 



O. clavulinum. 0. clavulinum hawaiense. 



O. mauritianum. 0. mauritianum. 



0. javanicum. 0. javanicum. 



0. swiftianum. 0. opella. 



0. micra. 0. goodalli. 



At least four species of the above lists may be expected to 

 occur anywhere in the warm zone. The failure to recognize 

 this has resulted in numerous synonyms. 



1. 0. GRACILE (Hutton). PL 18, figs. 3, 4, 5, 6. 



" Shell transparent, thin and pale-colored or rather color- 

 less; spire gradually tapering; whorls 12, body-whorl equal 

 to the two preceding ones. Aperture longer than broad, 

 semi-ovate; pillar-lip straight and slightly reflected; right 

 lip edged. Length 6~y 2 lines. I have only one of this 

 length, the generality being about 5 lines. It has also 12 

 whorls while the others have about 9 or 10 " (Hutton). 



India, type locality Mirzapur, Ceylon and the East Indies, 

 China, Formosa and Japan, etc. ; Mascarene Islands ; 

 Polynesia. 



Bulimus gracilis HUTTON, Journ. A&iat. Soc. Bengal iii, 

 1834, p. 93 and p. 84 (no. 5, Bulimust). REEVE, Conch. 

 Icon. pi. 69, f. 495. PFR., Conchyl. Cab. p. 79, pi. 21, f. 18, 

 19; Monogr. ii, 157; iii, 399; iv, 458; vi, 96. HANLEY & 

 THEOB., Conch. Ind. pi. 23, f. 4. Stenogyra gracilis Hutt., 

 MARTENS, Ostas. Landschn. p. 83, 375, pi. 22, f . 13 ; pi. 19, f . 5 

 (Bangkok; Ganges valley, India; Pointe de Galle, Ceylon; 

 Pulo Pinang, near Malacca ; Sumatra ; Java, Borneo, Celebes, 

 Timor, Adenare and Solor; Amboina, Buru, Ceram, Banda- 

 Neira). NEVILL, Handlist Moll. Ind. Mus. i, p. 164 (Assam; 

 many localities in British India and Ceylon; Andaman Is.; 

 Singapore; Sarawak; Jalk, Persia). BLANFORD, Obs. on 



