NEW SPECIES OP MOLLU8KS 
141 
bay, at the same time, is positively unrecognizable, even the 
genus can not be determined of the so-called “ Daphnella” 
effusa Cpr. 
The animal of M . crebricostata is whitish, except a little brown 
stain on the siphon and a pair of very conspicuous black eyes 
almost at the tips of long slender subcylindric tentacles. There 
is a marked indentation mesially on the duplex anterior edge 
of the foot. There is no trace of an operculum. 
Turbonilla (Pyrgisus) hbcuba, new species. 
Plate X, fig. 6. 
Shell elongate-conic, yellowish white. Nuclear whorls, at least 
two, depressed helicoid, having their axes at right angles to 
the succeeding turns, in the first of which they are about one- 
third immersed. Post-nuclear whorls flattened in the middle, 
gently slopingly shouldered at the summit, moderately rounded 
toward the sutures, marked by moderately strong axial ribs, 
which are almost vertical on the first six whorls, while on the 
last two they become decidedly retractive. Of these ribs, 22 
occur upon the second, 24 upon the third, 26 upon the fourth 
and fifth, 28 upon the sixth, 36 upon the seventh, and 48 upon 
the penultimate turn. The intercostal spaces upon the early 
whorls are about equal to the axial ribs in width, while on the 
last turn they are a little less wide than the ribs. In addition 
to the axial sculpture, the whorls are marked by strong, inter- 
rupted, spiral lines, which appear as pits in the intercostal 
spaces. Of these, five occur between the sutures on all the 
whorls but the last. On this, the one on the shoulder becomes 
split. Of these incised spiral lines, the first is on the middle 
of the shoulder, while the third is on the middle of the whorl, 
the second being a little nearer the third than the first. The 
space between the first and second appears as a low raised 
cord. The space between the third and fourth is almost double 
the width of that enclosed between the second and third, while 
the space between the fourth and fifth is equal to, or a little 
greater than, that between the first and second. These incised 
spirals pass up on the side of the axial ribs but do not cross them. 
