224 TORNATELLIDES OF HAWAIIAN ISLANDS. 



6 1 . Adult shells with the diameter more than 65% of 

 the length. T. spaldingi, no. 36. 



a 1 . Umbilicus about 0.4 mm. diam. ; shell 2.6 x 1.4 mm., broader 

 than T. perkinsi. T. comes, no. 31. 



a~. Umbilicus rather small, less than 0.3 mm. in diameter. 

 b. Diameter more than half the length ; 2.8 x 1.6 mm. 



T. micromphala, no. 35. 

 fe 1 . Diameter less than half the length. 



c. Parietal lamella wide ; whorls convex. 



T. frit, no. 32. 

 c 1 . Parietal lamella low ; whorls rather flat. 



T. perkinsi, no. 30. 



30. T. PERKINSI (Sykes). PL 49, figs. 1, 2, 5. 



" Shell elongate-pyramidal, subperf orate, corneous, striatu- 

 late under the lens. Whorls 7, rather flat, slowiy increasing; 

 suture somewhat impressed. Aperture ovate, bearing a rather 

 minute lamella on the parietal wall. Columella thickened, 

 whitish, marked with two inconspicuous plicse. Length 3, 

 diam. 1.2 mm." (Sykes). 



Kauai: Kaholuamano, at 4,000 ft. (Perkins), Olokele, Lihue 

 (Cooke). 



Tornatellina perkinsi SYKES, Fauna Hawaiiensis, ii, Mol- 

 lusca, p. 382, pi. 2, f. 14 (1900). 



"Its most noteworthy features are the very elongately 

 pyramidal shape, flattened whorls, and the two inconspicuous 

 plicaB on the columella, the upper one being more deeply 

 seated than the lower 77 (Sykes). 



The shells from Olokele were found on the fronds of Poly- 

 podium spectrum and are slightly smaller than the type spe- 

 cimen. One of them when compared with the type agreed 

 perfectly except in size. It has 7 whorls and measures : length 

 2.9, diam. 1.2, axis of apert. 0.85, par. lam. 0.065, umb. 0.27 

 mm. The columella is tumid above and its folds are low and 

 nearly transverse. The suture is distinctly margined. The 

 embryonic whorls are rather smooth, except in specimens 

 from Lihue which have the embryonic whorls regularly and 

 minutely transversely striate. 



