2, NEWCOMBIA. 



Key to Species of Newcombia. 

 ((. Parietal wall making an angle with the columella, the latter 



having a low fold or twist. 



b. Surface smooth to the eye, finely striate spirally under 

 a lens. Molokai. N. perkinsi, no. 6. 



N. philippiana, no. 5. 

 ft 1 . Surface spirally ribbed or coarsely striate, sinistral. 



Molokai. 

 c. Pale, the later whorls cream-colored; length 15 to 



25 mm. 



d. Spirals acute. N. plicata, no. 1. 



d l . Spirals rounded or subobsolete. 



N. p. gemma, no. la. 

 c\ Dark colored; length 12 to 18 mm. 



d. Spirals acute. N. canaliculata, no. 2. 



d l . Spirals obtuse, base darker. N. sulcata, no. 3. 

 b*. Surface with fine beaded spirals, a small carina at peri- 

 phery; zigzag-striped, dark-colored, dextral. Maui. 



N. carinella, no. 4. 

 a 1 . Parietal wall continuous with the columella, which is not in 



the least folded. Sinistral. 



b. Longitudinal folds coarse and strong, rude spirals run- 

 ning over them. Molokai. N. pfeijferi, no. 9. 

 ft 1 . Longitudinal folds weak or wanting. 



c. Very weak folds crossed by spiral threads, the inter- 

 vals of which are minutely wave-striolate spirally. 



N. cumingi, no. 7. 



c 1 . Smoother; spiral threads weak or effaced, the minute 

 wavy striolation well developed. Molokai. 



N. cinnamomea, no. 8. 



c*. Wrinkled or puckered over spiral cords; no minute 

 striolation. Molokai. A T . c. ualapuensis, no. Sa. 



Series of N. plicata. 

 1. N. PLICATA ('Mighels' Pfr.). PI. 1, figs. 1, 2, 3, 6. 



Shell sinistral, turrited, rather thin; sculptured with acute, 

 elevated, spiral lira? and very fine longitudinal lines; brown- 



