166 Trans. Acad. Sci. of St. Louis. 
ful result could be attained by pursuing such a course. 
Monterosato has attempted it in a partial manner in the case 
of the Mediterranean Daphnellids, but his genera, which in 
my opinion will be proved ultimately valid, have been sup- 
pressed by Cossmann and others. 
Thegname Daphnellini is here adopted for the tribal des- 
ignation, though the name Daphnella is antedated by both 
Cythara and Mangelia, because both of the latter have been 
called in question. Cossmann rejects Oythara altogether in 
favor of Hucithara Fisch., and Mangelia is generally spelled 
‘* Mangilia’’ by recent authors. These courses are both 
erroneous, however, since there is no necessity for the sub- 
stitution of Hucithara for the former, and the original spell- 
ing of the latter is Mangelia, which being the case, it is 
impossible to change it, in spite of the fact that the one 
intended to be honored in the name loses this honor by reason 
of the mistake. 
The two genera described below are both widely isolated in 
the structure of the embryo and in other characters : — 
Koclathurella n. gen. 
The shell in this genus-is small in size, more or less elon- 
gate, having when mature about three convex body whorls, 
the aperture oblique and rather narrow, oval or sublinear, 
much less than half as long as the shell, the sinus relatively 
large, deep, semicircularly rounded, strongly everted and well 
separated from the suture, the posterior callous prominence 
well developed. The inner lip is callous throughout, bearing 
three or four short transverse plicae at maturity, the canal 
very short and generally not strongly differentiated. The 
ribs are numerous, elongated and extend in gradually reduced 
form to the suture above, the spiral lyrae rather small and 
widely separated, but abruptly formed and slightly enlarged 
on the ribs, the fasciolar surface convex, crossed by the rib- 
bing but having finer and more close-set spirals. The embryo 
it relatively large, broadly conical, closely coiled and of 
between three and four whorls, the lowermost gradually 
acquiring some longitudinal riblets which merge gradually 
