198 TORNATELLIDES, POLYNESIA. 



TornateUina simplex PEASE, Proc. Zool. Soc. Loud., 1864, p. 

 673; 1871, p. 473. PFEIFFER, Mon. Hel. Viv., vi, p. 266 

 GARRETT, Proc. Acad. Nat. Sci. Phila., 1879, p. 22 ; Jour. Acad. 

 Nat. Sci. Phila., 1881, p. 398 ; ix, p. 82, pi. 2, fig. 21. Torna- 

 tellina Newcombi var., SCHMELTZ, Cat. Mus. Godeffroy, vi, p. 

 80. 



' i Mr. Pease 's type specimens were collected by me at Tahaa. 

 He either overlooked or inadvertently omitted to mention 

 the small, but constant, parietal lamina in his brief diagnosis. 

 The open umbilicus, small parietal lamina, smooth and simple 

 columella, will distinguish it from any other Polynesian 

 species" (Garrett). 



The embryonic stage has a very low parietal lamella but 110 

 columellar or palatal folds. 



The half -grown stage has a simple columella like the adult. 

 In comparing specimens from Rarotonga, Marquesas and sev- 

 eral of the Society Islands, no differences of importance were 

 noticed. The parietal lamella varies in strength in each lot, 

 but is never wide. It is nearly a half -whorl long. The Hua- 

 heiiie and Rarotoiiga (fig. 10) shells are a little wider and 

 more conic than most of those from Tahiti. 



Length 3.2, diam. 1.8 mm. (Tahiti, fig. 8). 



Length 3.1, diam. 1.8 mm. (Barotonga, fig. 10). 



5. T. OBLONGUS . (Anton). PL 44, fig. 13. 



"'Oval, conoidal, rather long, 5 convex whorls. Suture 

 deep. Apex acute. Aperture oval, with a flat fold on the 

 columella. Glossy, transparent, delicate, brown. Length 1%, 

 diam. % lines. 



"Var., more ventricose, shorter. Habitat Opana" (Anton). 



Shell very narrowly umbilicate, ovate-conic, thin, glossy, 

 pellucid, corneous. Spire acute. Whorls 5^, a little convex, 

 ' the last two-fifths the total length. Columella straightened, 

 vertical. Aperture suboval, slightly obstructed by an entering 

 parietal fold. Peristome simple, acute, the columellar margin 

 reflexed from the base, dilated-spreading above. Length 3, 

 diam. 1% mm., aperture \y$ mm. long, % wide (Pfr., T. 

 antoni) . 



