1890.] NATIUAI, SCIKNCES OK I'll ILA DKI-PIIIA. 287 



Hal). D()miiii(iuc\ >rai(iuesas Lshiiuls. A. Garrett, datum (No. 67). 

 Oha. Readily di.<tiiiguislied from the preceding species, by be- 

 ing larger, more globose and by its thin vitreous appearance. 



Helicina Garrettiana, Xohi^;. PI. III. fij;. 11. 



Shell thick, depres.sly conoid, apex obtu.se. base convex and 

 rounded at the periphery, suture strongly impressed, whorls 4, 

 finely striate, aperture sub-ovate, dark red within, lip white, widely 

 reflected, sometimes reddish, ])artaking of the color of the shell ; 

 color a light cardinal red, white beneath the suture, opercle thin, 

 corneous with a cord-like rim at the outer margin. 



Height 2-2 mm., diam. 8 mm. 



Hab. Too-apo Marquesas. A. Garrett, datum (67 bis.") 



The animals of the genus Helicina are denizens of dank and hot 

 climates, as the West Indies, tropical America, the Pacific, Austra- 

 lian and Philippine Islands, together with parts of Japan and 

 China. Dr. Pfeiffer, in his Pneumonopomorum Viventium, enumer- 

 ates about 338 species, to which, since the publication of his work 

 in 1876, about 30 have been added. This genus, so numerous 

 in individual species and so widely extended over regions favor- 

 able to molluscan life, seems to require a new classification or a 

 rearrangement of the species which, would facilitate their study 

 and identification. This will require a master hand like that of 

 Dr. Pfeifter's and a wide acquaintance with the species, to enable one 

 to relegate to their proper positions the numerous and diversified 

 species of this genus. At least four sub-genera could be founded 

 with advantage from the genus Helicina. 



Melania Eossiteri, Xobis. PI. Ill, tig. 12. 



Elongated, conic, cylindrical, regularly tapering, decollate, 

 whorls probably 8 or 9, smooth or with very obscure plica? be- 

 neath the suture, surface with sparse obscure spiral lines, suture 

 well impressed, color a dull olive, aperture oval, dull white, with a 

 deposit on the columella. Columella regularly curved. 



Diam. at base 8 mm. 



Obs. I possess three examples from E. L. Layard, Esq. who in- 

 forms me that they were collected at Vate, New Hebrides by ^Ir. 

 Ro.ssiter. This .species is distinguished by its being more uniform- 

 ly cylindrical and tapering to the apex less rapidly than .1/. Arthurl, 

 M. Montrouzierl, M. Lamberti, M. Matheroni, M. Marie or any other 

 species from the N. Hebrides with which I am acquainted. 



