APPENDIX 
285 
Subgenus Mormula (see p. 144) 
Turbonilla enna Bartsch, 1927 
Proceedings of the United States National Museum, 70: 10; PI. 2, fig. 8. 
Shell elongate-conic, pale brown. Nuclear whorls decollated. Post- 
nuclear whorls marked by very slightly retractively slanting, low, poorly 
developed axial ribs which are a little broader than the spaces that separate 
them. Of these ribs, 18 occur upon the second, 22 upon the third and 
fourth, 24 upon the fifth and sixth, 26 upon the seventh, while upon the 
remaining turns they become more irregular and more numerous and 
ill-defined. In addition to this the whorls are marked by five spiral lines of 
pits in the intercostal spaces which extend up on the sides of the ribs but 
scarcely cross them. These pits are a little narrower than the spaces that 
separate them. There are also at irregular intervals indications of varices. 
Aperture moderately large, oval, posterior angle obtuse; outer lip fractured, 
showing six strong spiral folds within, of which three are anterior and 
three posterior to the periphery; columella slightly expanded and reflected 
over the umbilicus; parietal wall covered by a rather thick callus. 
Type in United States National Museum, No. 362440. Type locality, 
in six fathoms off Deadman Island, San Pedro, California. It has almost 
nine whorls remaining and measures, length, 11.6 mm.; diameter, 2.8 mm. 
Turbonilla Clementina Bartsch, 1927 
Proceedings of the United States National Museum, 70: 11; PI. 2, figs. 9, 10. 
Shell broadly elongate-conic, chestnut brown. Nuclear whorls a little 
more than two, forming a depressed helicoid spire, the axis of which is at 
right angles to that of the succeeding turns, in the first of which the 
nuclear spire is about one-fifth immersed. The nuclear whorls project 
slightly beyond the left outline of the postnuclear spire. First postnuclear 
whorl well-rounded, the succeeding five somewhat shouldered, about one- 
third the distance between the summit and the suture, anterior to the 
summit, while the last three are slightly rounded and rendered slightly 
concave below the somewhat excurved summit. The whorls are marked 
by slightly protractive axial ribs, which are strong on the early whorls and 
become enfeebled on the later turns. Of these ribs, 24 occur upon the 
first, 20 upon the second, 18 upon the third, 20 upon the fourth and fifth, 
24 upon the sixth, 26 upon the seventh, 30 upon the eighth, and 34 upon 
the last turn. The spaces which separate these ribs are a little narrower 
than the ribs on the early turns, and about equal to the ribs on the last 
turn. In addition to the axial ribs the whorls are marked by six strong, 
incised .spiral lines, which almost equally divide the posterior three-fourths 
of the whorls. The space between the summit and the first strongly incised 
[ 583 ] 
