52 



TEMNOCHILUS GREEN ENS E, H. sp. 



Plate V, Fig. 3, lateral view, the body chamber and part of the air 

 chambers not preserved. A transverse section being 

 trapezoidal in outline, the dotted line 

 in the figure in the text should 

 be contracted. 



Fig:. 1, transverse section, but the dotted line should be contracted 

 to a trapezoidal outline. 



Species very large, subdiscoidal, and consisting of five or more 

 volutions, though our specimen, being imperfect, shows less than 

 four. Umbilicus very wide, perforated and discloses about four- 

 fifths of the dorso-ventral diameter of each inner turn. Transverse 

 Section subtrapezoidal. Our specimen is injured upon one side, and 

 hence a correct transverse section could not be taken from it; it is 

 clear, however, that the sides are not equal, that a section is sub- 

 trapezoidal, and that the dotted line drawn by the artist, in the 

 figure, should be considerably contracted. The lateral diameter is 

 near one third greater than the dorso-ventral. The ventral side is 

 highly convex and subangular subcentrally, the lateral sides are more 

 highly convex, subangular. and bear on the angular* ridge a few very 

 large obtuse nodes, about ten or twelve nodes on each whorl. The 

 contact furrow is not disclosed in our specimen. The sutures are 

 direct on the umbilical side, but form broad saddles over the angles 

 with shallow intervening lobes. The septa are distant, on the ventral 

 side, about one-third the dorso-ventral diameter. 



The siphuncle is small, only slightly expanded within the air cham- 

 bers, and situated on the ventral side of the center or between the 

 subangular ridges on the lateral sides. Outer shell and living cham- 

 ber unknown. 



