112 



THE HAWAIIAN SPECIES OF OPEAS. 

 By E. R. Sykes, B.A., F.L.S. 



Read 8tk April, 1904. 



Recently, when cataloguing the Hawaiian fauna,' I admitted three 

 species of this genus, namely, O.junceus (Gld.), 0. Prestotii, Sykes, and 

 0. pyrgiscus (Pfr.) ; also noting the manuscript name of 0. striolata, 

 Pease. Further material, collected in Hawaii by Professor Henshaw, 

 has been submitted to me by him, and I am now enabled to give some 

 additional details. Figures are also given in order that the forms 

 discussed may be the more readily identified. 



1. Opeas junceus (Gould). (Fig. 1.) 



Hah. — Hawaiian Islands (Gould) ; all the islands (Baldwin) ; Oahu, 

 Waianae Mountains (Perkins) ; Hawaii, Kohala, Kau (Henshaw). 



2. Opeas Henshawi, n.sp. (Fig. 2.) 



Shell subperforate, turreted, somewhat solid, with closely-set, well- 

 marked, curved, longitudinal striae; light-yellowish horn-colour. Spire 

 well drawn out, suture well-marked, but the whorls not so shouldered 

 as in O.junceus. Whorls 8^, plano-convex, the last whorl inflated, 

 and measuring about half of the total length of the shell, somewhat 

 compressed at the base. Mouth somewhat axe-shaped, the columellar 

 margin reflexed and rather sinuous above. Alt. 12-5 mm. ; diam. max. 

 4 mm. 



Hab. — Hawaii, Hilo (Henshaw). 



The salient features of this form are its yellow colour, the well- 

 marked, curved striae, the size and inflation of the last whorl, and the 

 slightly sinuous columellar margin, which bends to the left above and 



Fauna Ilawaiieusis," vol. ii, p. 383. 



