TORNATELLINA. 159 



19. T. GRACILIS Pease. PL 43, figs. 7, 8, 9 ; pi. 42, fig. 11. 



Shell elongate, slender, thin, glossy, smooth, marked with 

 very delicate growth-striae, brownish corneous. Whorls 5, 

 convex, the last whorl flattened, sometimes concentrically sul- 

 cate in the middle. Aperture small, acutely ovate. Parietal 

 lamella strong, prominent ; columella strongly callous, twisted. 

 Length 3.75, diam. 1.5 mm. (Pse.). 



Kauai (Pease) : Kalalau, Lirnahuli and Wailua (Cooke) ; 

 Oahu: Diamond Head and Round Top (Cooke); Maui 

 (Thwing; Ancey, for T. extincta) ; Hawaii (Pease, see label 

 Mus. Comp. Zool.) ; Kona (^Perkins, Thwing), Hamakua 

 (Henshaw). Lays an Island (Bryan). 



Tornatellina gracilis PSE., Proc. Zool. Soc. Lond., 1871, p. 

 460. ? SYKES, Fauna Hawaiiensis, Mollusca, 1900, p. 381. 

 Tornatellina extincta ANCEY, Bull. Soc. Malac. France, vii, 

 1890, p. 341; Journ. of Malac., xi, 1904, p. 70. HENSHAW, 

 Journ. of Malac., xi, 1904, p. 64. 



Pease's examples of this species, in the Museum of Com- 

 parative Zoology, are mixed with typical specimens of T. ob- 

 longa. None of the specimens of T. gracilis in the collection 

 of the Bishop Museum are as broad as Pease 's measurements, 

 which were probably taken from one of the specimens of T. 

 oblonga. 



Specimens from the different Islands measure as follows : 



Length 3.0, diam. 1.1 ; whorls 5%, Kauai, Kalalau. 



Length 3.2, diam. 1.1 ; whorls 6. Oahu, Diamond Head. 



Length 2.75, diam. 1.2 ; whorls 53/4. Oahu, Bound Top (fig. 



7). 



Length 3.4, diam. 1.2; whorls 6y 2 . Hawaii, Kona (fig. 8). 



Embryonic examples (pi. 42, fig. 11) from Bound Top, 

 Oahu, have the surface of the shell faintly spirally striate. 

 The columella is slightly swollen ; the upper fold is weak, the 

 median strong. The parietal lamella is very strong, about 

 three-fourths of a whorl in length. 



An example from Diamond Head (fig. 9), at the metaneanic 

 stage, is 2.14 mm. in length and has 43/4 whorls. The parietal 

 lamella is strong, lobed and with a sinuous margin. The colu- 



