160 Trans. Acad. Sci. of St. Louis. 
concave fasciolar surface below the usually well-developed 
subsutural collar and frequently tending to disappear on the 
larger whorls, a very short aperture, short, angulate base 
with nearly obsolete canal, open anal sinus of the usual form 
in Olavus and a conical pointed smooth multispiral and closely 
coiled embryo. Among the typical species may be mentioned 
depygis Con. (=Jlaevis Con. and pinaculina and solitariuscula 
De Greg.), with its varieties Jonsdali Lea and surculopsis and 
Jita De Greg., of the Upper Claiborne ferruginous sand and 
tecana Con. (=texacona Harr.), of the Lower Claiborne of 
Texas. It is possible thatsuch forms as ¢antula Con., of the 
Vicksburg Oligocene, may also be included, although in that 
species there is no well-defined subsutural collar and the ribs 
attain the suture above. Hboroides, of Conrad, is more 
nearly a Clavus and cannot be included. 
BELINI. 
The species of this small tribe are exclusively inhabitants of 
European arctic and subarctic waters, as far as definitely 
known to me at present. They are moderate or small in 
size and of thin fragile substance, frequently having a whitish 
coating which is difficult to remove in many cases, and, in 
others, suchas Typhlomangilia and Bela pyramidalis Strém., 
bears the characteristic sculpture of the shell. The embryo 
varies in a most remarkable manner and serves to indicate, 
with other accompanying characters, some six or seven 
genera among the present representatives of Bela. Coss- 
mann has referred several fossil forms to the genus Bela 
in its broad sense, but there is some doubt if any of them 
belong to the present tribe. The Australian Eocene ‘ plesio- 
type’’ Bela pulchra Tate, certainly resembles some forms 
allied to Clathurella more than it does the Belini, especially 
in the conformation of the posterior parts of the aperture, but 
the large obtuse embryo would isolate it there, though scarcely 
more so than the American Eocene ZHoclathurella to be de- 
scribed below. In any event Bela pulchra will form the type 
of a very distinct genus, probably assignable to the non- 
operculate series. 
