170 NEW YORK STATE’ MUSEUM 
preabdomen, since the latter is here only as long as the carapace, while in 
the resulting adult it is longer by one fourth. 
The postabdomen in the young exhibits its usual proportions. 
The ornamentation of the dorsal side shows a difference between the 
neanic and ephebic forms in the recognizable number of longitudinal 
series of scales, the former possessing but four on the anterior preab- 
dominal and two on the following seyments as against six and two in the 
ephebic stage. 
Measurements. A well preserved and normal specimen, plate 5, figure 
5, gives the following figures: length and width of carapace, 18.7 mm 
and 24.5 mm; length and width of preabdomen, 27.3 mm and 27 mm; 
length of postabdomen, 40.4 mm; its anterior and posterior widths, 20 
and 7 mm. The telson measures 28 mm and is 5 mm wide at its begin- 
ning. The lateral eyes of this specimen are 5 mm long and 5.5 mm from 
the frontal margin. The first tergiteis 3.6 mm long and 25.5 mm wide, the 
third about 6 mm long and 27.4 mm wide. The first postabdominal segment 
is 6 mm long and 19 mm wide in the middle, the last measures 10.5 mm 
by 8.5 mm. 
The largest carapace observed is so mm in length and 67 mm in 
width; the one figured on plate 6, figure 3 is 45 x 60 mm. | 
Horizon and localities. DeKay’s type of this species came from 
Waterville, town of Westmoreland, Oneida co., N. Y. Hall’s numerous 
originals were partly from the same locality and in still greater number 
from Jerusalem or Wheelock’s hill, Litchfield, Herkimer co., N. Y. which, 
with its neighborhood, has to this day furnished the principal supply of 
this species. In late years it also has been obtained in great numbers a 
few miles northeast (near Cedarville) and west (Paris Hill) of Jerusalem 
hill. It occurs near Oriskany; at Cayuga junction, Cayuga co. and pos- 
sibly at Buffalo. In all these localities it has been found in the upper- | 
most part of the Bertie waterlime, near the overlying Cobleskill limestone. 
But we have also from Seneca Falls, Seneca co., typical specimens from the 
Rondout waterlime above the Cobleskill limestone. 
