TORNATELLINA. 157 



peponum Gld., SYKES, Fauna Hawaiiensis, Mollusca, p. 382. 

 Not T. peponum ANCEY, Journ. de Conchyl., li, 1903, pp. 301, 

 302. 



The description and figures 1, 2 are from the type speci- 

 men, no. 5506 Smithsonian Institution, already drawn in 

 Gould's figure 104. Mr. Sykes, who has shown that Gould 

 confused three species in his description and figures of T. 

 peponum, selected figures 104, 104d of the Exploring Expe- 

 dition Atlas to retain tha-t name; figs. 104 a, b, c becoming 

 T. confusa Sykes, while fig. 104e is a species of Tornatellaria. 



A young specimen, pi. 42, figs. 4, 5, is 2.1 mm. long and has 

 4!/4 whorls. At this stage (early metaneanic) the parietal 

 lamella is large, lobed and with a very sinuous margin. There 

 are two strong serrated palatal ribs, only one of which is 

 visible through the aperture. The columella is vertical, 

 slightly sigmoid, the upper columellar fold is not strong; the 

 median lamella is strongly developed and there is no indica- 

 tion of a lower (sub-columellar) tubercle. 



A second young specimen (pi. 42, fig. 6, paraneanic stage) 

 is 3.0 mm. long and has 5^ whorls. At this stage the parietal 

 lamella is strong, lobed and has a sinuous margin. There are 

 two palatal ribs visible through the aperture. These ribs are 

 not as strong nor are they as serrated as those of the speci- 

 men at the metaneanic stage. Neither is the median colu- 

 mellar fold as strong as at an earlier stage. 



At the ephebic stage the parietal lamella is straight, the 

 columella twisted and without the median fold, and the pal- 

 atal ribs have disappeared. 



The relationship of T. peponum to T. oblonga Pse. is ex- 

 tremely intimate. It differs slightly from oblonga in having 

 a callus within the lower part of the columellar concavity, 

 visible in an oblique view, and sometimes in the face view. 

 This callus in T. oblong a is usually not noticeable, or is less 

 developed. The last whorl of T. peponum does not have the 

 flattening and depression characteristic of mature T. oblonga. 

 The neanic stage differs. 



PL 35, figs. 5, 6, are from a specimen measuring length 3.8, 

 diam. 1.5, aperture 1.2 mm., whorls nearly 6, from Maui. 



