248 NILS HJ. ODHNER 



moUusca have a world-wide distribution as a consequence of introduction; tiius 

 their occurrence in Easter Island is evidently of a recent date. 



The collection contains the following marine forms (those with an asterisk 

 are mentioned by Dall), most of them taken on the beach at Hanga Pico, 

 Vt 1917: 



Glyphis foveolata Garrett, i sp., 1. 5 mm. 



Gena varia A. Adams, 3 sps., max. 1. 6,3 mm. 



Nerita niorio Sowerby, many sps., max. 1. 10,5 mm. 



Euchelus foveolatus A. Adams, i sh., h. 3,7 mm. 



Tectarius nodulosus Gmelin, many sps., max. h. 10 mm. Dall has on 

 his list T. pyramidalis Quoy, which according to Tryon is a synonyme. 



*Planaxis mollis Sowerby, many sps., max. h. 12,3 mm. 



Rissoa plicatula Gould, many sps., max. h. 5,8 mm. 



Rissoa tridentata Michaud, 4 sps., max. h. 4,3 mm. 



Trifora levukensis Watson, i sh., h. 4,2 mm. Dall mentions a Tri- 

 foris sp. The specimen is figured on PI. 8, fig. 6. 



*Hipponyx grayanus Menke, i sp., diam. 10,5, h. 4 mm. 

 *Hipponyx barbatus Sowerby, 4 sps., max. diam. 14,7, h. 8 mm. 



*Cypraea caput dracoiiis Melvill, many sps,, common on the beach, 

 max. 1. 33,5 mm; this seems to be merely a \2LX\Q\.y o^ C. caput serpentis\Jv!\w€. 



Pisania ignea Linne, i sp., h. 7,5 mm. 

 Marginella sandwicensis Pease, 4 sps., max. 1. 2,2 mm. 

 *Conus miliaris Hwass, i sh., h. 23 mm. 

 *Smaragdinella viridis Rang, i sp., 1. 6,3 mm (shell). 



Bertella brocki Vayssiere, 3 sps., max. 1. about 17 mm. Though the 

 notum does not exhibit as characteristically as figured by Vayssiere 1898^ 

 the mucous pores, the form and sculpture of the shell, as well as the elements 

 of the mandibulae and the teeth of the radula are like those of the type. 

 Through this occurrence the area of distribution of this species is widely extended, 

 to comprise the whole Indo-Pacific from Mauritius to Japan (BoCK coll., R. M.), 

 and Easter Island. 



Lucina divergens Philippi, 1 left valve, 1. 13,6 mm. 



Siphonaria pica Sowerby, i sp., 1. 4,6 mm. 



^ Monographie de la Famille des Pleurobranchides. Ann. Sci. Nat. Zool. T. 8. 



