PLATE XXXI 
Fig. 1. Leurorthoceras hanseni Gen, et Sp. nov. Lateral view of specimen 
figured on Plate 30 (fig. 1), with the ventral side facing toward the right. 
Fig. 2. Cyclendoceras or Dawsonoceras . Apparently a part of a living chamber, 
with the median line of the ventral side about 10 mm. from the right margin of 
the figure. Either from Boothia Felix or from King William Land; from dolo- 
mitic strata regarded as of Ordovician age, but which may turn out to be 
Niagaran. In HoltedahPs paper ‘‘On Some Ordovician Fossils from Boothia Felix 
and King William Land,” Figure 1 on Plate IV presents another species collected 
during the same expedition and undoubtedly from the same locality; in this 
specimen the sutures of the septa occupy the grooves between the annulations. 
Fig, 3. Cyclendoceras annulatum (Hall). All but the extreme top of the type 
described and figured by Hall (Pal, New York, 1, 1847, pi. 44, figs, la, lb). The 
ventral side is on the right of the figure. From Watertown, New York; in the 
Trenton limestone. No. 811 in the American Museum of Natural History in 
New York City. 
