N0.1452. NOTES OX PYRAMJDELLID.K—DALL AND BARTSCII 337 



TURBONILLA (CHEMNITZIA) ABSEIDA, new species. 

 Plate XXI, tig. 4. 



Shell lai'ge, elongate-conic, milk-white, shining. Nuclear whorls 

 decollated. Post-nuclear whorls decidedly rounded, slightl}' shouldered 

 and somewhat constricted at the periphery, marked b}^ very strong- lam- 

 ellar oblique axial ribs and deepi}' impressed intercostal spaces which 

 are about twice as wide as the ribs. The ribs do not fuse at the sum- 

 mit ])ut terminate strongly as cusps, rendering the outline of the 

 sunniiits wavy; they fuse at the periphery and there suddenly termi- 

 nate the deep intercostal spaces. The type, which has lost the nucleus 

 and perhaps the first three post-nuclear whorls, has fourteen ribs on the 

 first (remauiing), sixteen on the fifth, and twenty-two on the penulti- 

 mate whorl. The summits of succeeding whorls on the later volu- 

 tions drop a little anterior to the periphery and permit a narrow plain 

 band to appear above the suture. Periphery of the last whorl slightly 

 angulated. Base short, well rounded. Aperture moderateh' large, 

 subquadrate, posterior angle obtuse; outer lip thin, showing the exter- 

 nal sculpture within by transmitted light; columella oblique, revolute, 

 with a weak oblique fold at its insertion. 



The type and five additional specimens belong to the Dunker collec- 

 tion and come from Japan. One of these has been donated to the 

 U. S. National Museum, where it is entered as No. 185S86. The ten 

 remaining post-iuiclear whorls in the type measure: long. S.-i nun.; 

 diam. 2.3 nun. Another specimen lacking onh' the luicleus has twelve 

 post-nuclear whorls and measures: long. 8 mm.; diam. 2.3 nun. It is 

 possible that this form ma\" be Turh nulla per fecta A. Adams, but this 

 can only be decided when Adams' t^^pes shall have been located. His 

 scant descriptions and lack of measurements make positive identifica- 

 tion impossible when dealing with Chemnitzia^ Turhonilla, or Odos- 

 tomhi. 



TURBONILLA (CHEMNITZIA) APPROXIMATA, new species. 



Plate XX, tig. L 



Shell elongate-conic, gentl}' tapering, white. Nuclear whorls decol- 

 lated. Post-nuclear whorls flattened, slightly shouldered, ornamented 

 b}" strong, rather narrow, oblique, axial ribs which are distinct at the 

 sununit but fuse at the periphery. Twelve of these ribs appear on 

 the first, fifteen upon the fifth, eighteen upon the tenth, and twent}-- 

 two upon the penultimate whorl. Intercostal spaces a little wider than 

 the ribs, decidedly depressed, terminating suddenly at the periphery. 

 The summit of the succeeding whorls falls a little anterior to the 

 termination of the intercostal spaces and leaves a very narrow smooth 

 area above the well-marked sutures. Periphery of the last whorl \ery 

 Proc. N. M. vol. XXX— 0(5 22 



