TORXATELLIDES OF HAWAIIAN ISLANDS. 229 



One of the larger specimens has 7 whorls aiid measures: 

 length 3.2, diam. 1.8, axis of apert. 1, par. lam. 0.09, umb. 0.63 

 mm. Another lot from the Ancey collection has a number of 

 immature specimens. One of them, with 5*/j whorls, has the 

 apical whorls nearly smooth. The columella is furnished with 

 two strong almost transverse nearly equal folds of which the 

 upper is 0.09, the lower 0.13 mm. in height. The parietal la- 

 mella is oblique, 0.18 mm. in height. 



In an embryonic shell, from Nuuaim, Oahu, the first whorl 

 is irregularly spirally striate, the second faintly and irregu- 

 larly clathratulate. There is a minute perforation. The colu- 

 mella is straight. The lower columellar fold is present, the 

 upper is merely indicated by a faint swelling on the inner 

 margin of the columella. The parietal lamella is well de- 

 veloped and slightly oblique (tig. 1.6). 



T. macromphala is common in pleistocene or later deposits 

 on several islands. One from the bluff west of Kahuku, Oahu, 

 measures, length 3.2, diam. 2 mm. 



34, T. m. ada P. & C., n. subsp. PL 49, tigs. 17, 18. 



The shell is slightly smaller than T. macromphala from 

 which it differs chiefly by having a conspicuously smaller um- 

 bilicus, both within and at the opening ; but it is, however, de- 

 cidedly larger within than in T. micromphola. There are two 

 distinct though small columellar lamellae. Length 2.6, diam. 

 1.55 mm. Whorls 6. 



Oahu: Glen Ada, north side of Nuuanu Valley (Pilsbry). 

 Type no. 112538 A. N.-S. P., cotype in B. P. B. Mus. 



35. T. MICROMPHALA P. & C., n. sp. PL 49, figs. 12, 13. 



The shell is conic, somewhat like T. macromphala, but nar- 

 rower, with the whorls more convex. Umbilicus much nar- 

 rower both within and at the opening ; the wall bounding tin- 

 umbilicus is convex, not flattened as in macromphala. Parie- 

 tal lamella low but rather long. Two weak and subhorizontal 

 columellar lamellae, continuing to the edge. Length 2.8. diam. 

 1.6 mm.; umbilicus 0.3 mm. Whorls 6. 



Molokai: Western ravine of Kamalo (Cooke & Pilsbry). 

 Type no. 112536 A. N. S. P.. cotyp'S in B. P. B. Mns. 



