196 CONTRIBUTIONS 
The smaller figure is of the size of nature. 
Observations. A single specimen only of this minute 
species came into my possession. It most strongly resem- 
bles the pharetra, herein described. It may be distinguished 
by its diminutive size, its flattened sides, its ribs and base. 
With a microscope of considerable power, it was not possi- 
ble to discover any pores, which, I strongly suspect, exist 
between the ribs. In this specimen there is no style, and 
it may be doubted if it ever exist in this species. 
T. pharetra. Plate 6. Fig. 210. 
Description. Turbinolia clavate, longitudinally ribbed ; 
furrows with a double row of minute perforations ; ribs 
twenty-four, six of which terminate at a point on the cen- 
ire of the base; six others terminate between these, higher 
up; these twelve being enlarged at the base, the remain- 
ing twelve, alternating, terminate above these again ; star 
round ; style rather elevated, with six radii. 
Diam. .1, Length .3, of an inch. 
The superior view shows the stella of the style. 
The segment is a magnified view. 
Observations. In its form, this species has an almost 
perfect resemblance to the sulcata (Lamarck). It differs 
in the arrangement of the ribs, and judging from the figure 
of Goldfuss (pl. 15, fig. 3), I should suppose it to differ in 
the style also. The minute pores which exist in our spe- 
cies do not appear to be in the sulcata; at least they are 
not noticed by Lamarck or Goldfuss. Brogniart’s figure* 
* Desc. Geolog. des Environs de Paris, pl. 8, fig. 3. 
