86 
AUG. F. FOERSTE 
ually become more rounded, the more apical volutions being 
nearly circular in cross-section. There is some resemblance here 
between the mature form of Poleumita hellasculptilis and Lopho- 
spira centervillensis , but since their early stages are entirely 
different, according to the description presented by Salvage, it is 
not likely that they are related generically. 
Loxoceras husseyi Sp. nov. 
Plate XV, figs. 3 A-D 
Conch in its present condition more or less ellipitical in cross- 
section; 15 mm. wide laterally and 11 mm. in diameter dorso- 
ventrally at the larger end of one fragment of a phragmacone. 
At the smaller end of this fragment, 30 mm. distant, the corre- 
sponding diameters are 9.5 and 8.5 mm. Originally the cross- 
section probably was circular, or nearly so. Apical angle usually 
about 10°, equalling 12° or 13° in several specimens. Nine 
camerae occur in this length of 30 mm. At the smaller end of 
the specimen there are about 3 camerae in a length equal to the 
lateral diameter at the top of the series being counted. Farther 
up this number changes to 3.7 camerae in a corresponding length. 
The sutures of the septa are directly transverse. The con- 
cavity of the septa is not well shown except at the smaller ends 
of specimens, but it is estimated to have been about 4 or 5 mm. 
where the diameter is 12 to 15 mm. Location of siphuncle 
central, or nearly so. Segments of siphuncle oblong-elliptical, 
or slightly narrower below so as to be slightly fusiform in out- 
line; 2.5 to 3 mm. wide in specimens in which these segments 
are 3.5 mm. in length. Septal necks short, from 0.25 to | mm. 
in length. 
Surface smooth. In a considerable number of specimens in- 
distinguishable in any other respect from the smooth forms, the 
surface of the shell is covered by numerous very fine vertical 
striae varying from 7 to 13 in number in various individuals. 
Provisionally these striae are regarded as due to the structure 
of the interior of the shell, the striae appearing after a certain 
amount of weathering has taken place. 
