2 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 66. 



and two additional folds which are much weaker, the anterior one 

 being the weaker. 



The type, Cat. No. 359747, U.S.N.M., has lost the nuclear whorl 

 and probably the first two and a half postnuclear turns. The 7.5 

 remaining measure: Length, 6.4 mm.; diameter, 2.5 mm. Cat. No. 

 859748, U.S.N.M., contains another specimen from the same locality. 



This species suggests in size Pyramidella {Pharidella) panamen.sis 

 Dall and Bartsch, but it is distinguished from this at once by its 

 much broader whorls and less deep sutural channels, and absence of 

 the axial riblets. 



TURBONILLA (CHEMNITZIA) THEONE. new species. 



Plate 1, fig. 6. 



Shell short, stout, elongate-conic. Nuclear whorls decollated. 

 Postnuclear whorls slightly rounded, narrowly slopingly shouldered 

 at the summit, marked by broad, strongly protractively curved axial 

 ribs, of which 16 occur upon the second, 18 upon the third, 20 upon the 

 fourth, 22 upon the fifth, 24 upon the sixth, 26 upon the seventh and 

 the last whorl. These ribs render the summit of the whorls feebly 

 crenulated. The intercoastal spaces are a little less wide than the 

 ribs, and only feebly impressed, terminating at the periphery. Base 

 rather long, strongly rounded. Aperture oval; posterior angle ob- 

 tuse; outer lip fractured; inner lip reflected and appressed to the 

 base for two-thirds of its length, provided with a feeble oblique fold 

 a little anterior to its insertion; parietal wall covered by a thin 

 callus. 



The type. Cat. No. 359756, U.S.N.M., has lost the nucleus. The 

 7.5 whorls remaining measure: Length, 4.9 mm. diameter, 1.7 mm. 

 Cat. No. 359757, U.S.N.M., contains another specimen from the type 

 locality. 



This sj^ecies differs from all the other members of the West coast 

 by its almost elongate oval outline and stout shape. 



TURBONILLA (CHEMNITZIA GENOA, new species. 



Plate 1, fig. 3. 



Shell small, subdiaphanous, yellowish white, with a bluish band 

 at the summit of the whorls where this is appressed to the preceding 

 turn. This band gives the shell the appearance of being ornamented 

 by a string of beads at this place. Nuclear whorls decollated. Post- 

 nuclear whorls slightly rounded, rather strongly obliquely tabu- 

 latedly shouldered at the summit, crossed by slightly protractive 

 ribs, which render the summit crenulated, and which are about as 

 wide as the spaces that separate them. Of these ribs, 16 occur upon 

 the first and second, 18 upon the third, 20 upon the fourth, 22 upon 



