TORNATELL1DES OF HAWAIIAN ISLANDS. 247 



ridge south of the Nuuanu Pali, and consists of two adult and 

 six immature specimens. 



T. terebra is its closest relative. T. prionoptych'ia is broader 

 in proportion to its length, and the spire is less produced, with 

 more conic outlines. 



51. T. SERRARIUS P. & C., 11. sp. PL 52, figs. 6, 7. 



The shell is ovate-turrite, umbilicate (the umbilicus open, 

 well-like, the last whorl not deviating tangentially), light 

 pinkish-cinnamon, somewhat transparent, not very glossy. 

 Spire conic with straight outlines and subacute apex. Whorls 

 6*/3, convex, the last narrowly rounded around the large um- 

 bilicus, inside of which the columellar lamellae can be seen 

 through the shell. Aperture small. Parietal lamella long 

 but not wide, serrate, bearing long points directed forward. 

 Columellar margin broadly dilated. Columella convex above 

 the middle, and bearing two very low, thread-like lamellae, 

 which reach weakly to the margin. Length 2.7, diam. 1.7, 

 aperture 0.9 mm.; width of umbilicus 0.35 mm. 



Oahu: Glen Ada (Pilsbry). Type no. 112539 A. N. S. P. 



Related to T. spaldingi, which is a much shorter species, 

 with only slight traces of serration on the parietal lamella; 

 but in an entirely natural classification these two species be- 

 long together. The open, well-like umbilicus and serrate la- 

 mella separate T. serrarius from the widespread T. macrom- 

 phala. T. prionoptychia is closely related, but it is a narrower 

 shell with the umbilicus smaller within the axial perforation 

 only about half as wide as the orifice. 



52. T. FORBESI C. & P., n. sp. PL 52, figs. 8, 9. 



Shell perforate, convexly elongate, corneous, somewhat 

 transparent, slightly glossy, with an oily luster, under a lens 

 minutely and almost regularly striate with lines of growth. 

 Spire convex in outline, apex rather blunt ; suture lightly im- 

 pressed, minutely and almost regularly crenulate. Whorls 

 6y 2 , the embryonic smooth, increasing rapidly, the rest in- 

 creasing slowly, slightly convex, the last compressed, with 

 an almost truncate base. Aperture rather large, truncate-oval. 



