NO. 2 PYRAMIDELLID MOLLUSKS — BARTSCH 6l 



Spiral cords 4 between the sutures on the later whorls. 



Suture very strongly constricted, whorls angulated at the 

 second spiral cord. 



First spiral cord much weaker than the second. 



Shell ovate dalli 



Shell elongate-ovate cookei 



First spiral cord not smaller than the second. 



Shell ovate gardnerae 



Shell elongate-ovate. 



Shell large harrisi 



Shell small palmerae 



Suture not strongly constricted. 



Shell elongate-ovate mansfieldi 



Shell elongate-conic macneili 



Axial ribs not stronger than the spiral cords. 



Spiral cords between the sutures of the later whorls 5. 



Sculpture strongly developed simpsoni 



Sculpture not strongly developed. 



Shell stout woodringi 



Shell slender vaughani 



Spiral cords between the sutures of the later whorls 4. 

 Suture deeply channeled. 



Shell elongate-ovate stimpsoni 



Shell elongate-conic. 



Base umbilicated leai 



Base not umbilicated. 



Shell stout locklini 



Shell slender sayi 



Suture not deeply channeled. 



Whorls shouldered from the second cord to the suture. 



Shell stout stntthi 



Shell not stout pilshryi 



Whorls not shouldered from the second cord to the 

 suture. 

 Shell elongate-ovate. 



Basal spiral cords strong mcgintyi 



Basal spiral cords feeble tuomeyi 



Shell not elongate-ovate. 



Shell elongate-conic holmcsi 



CHRYSALLIDA ALDRICHI, new species 



Plate 15, figure 13 



Shell minute, elongate-ovate, cream-colored. The nucleus consists 

 of about 2 whorls, which are obliquely immersed in the first post- 

 nuclear turn. The postnuclear whorls are flattened and crossed by 

 strong, slightly protractively slanting axial ribs. Of these ribs 12 are 

 present upon the second, 13 upon the third, 14 upon the fourth, and 

 16 upon the last whorl. The ribs are equally strong from the summit 



