166 NEW YORK STATE MUSEUM 
third longer than wide, distinctly convex forward and furnished with a 
small spine at the posterior end of the gently concave distal margin. The 
fiith segment is subquadrate, deeply emarginate at the under side of the 
distal extremity [pl. 7, fig. 8] and furnished with a triangular process on 
the upper side. The sixth segment is semioval, rapidly expanding distally 
and bearing an acute articulating process on the distal extremity. The 
seventh and eighth segments are much expanded; the seventh subrectan- 
gular, its anterior side very convex, the posterior nearly straight. The 
triangular guard plate is of relatively large size, its distal margin finely 
serrate. The eighth segment is oval in outline, about as long as the 
seventh, but only half as wide. Its anterior margin is very finely serrate, 
the serrae becoming longer and narrower toward the extremity and 
grouped into larger serrae, alternating with about six small ones [pl. 7, 
fig. 11]. The latter segment bears the small, oval, rudimentary ninth 
segment. 
The epicoxite has not been seen in position; - a detached epicoxite, 
found in association with this species and presumably belonging to it, is 
reproduced on plate 7, figure s. 
The endostoma has not been seen. 
The metastoma is oval, not quite twice as long as wide, widest in the 
middle, or a little in front of the middle. The anterior extremity is 
gently emarginate and the posterior truncate. 
The genital appendages of the species have been found well developed 
in but very few specimens, obviously owing to the fact that the great ma- 
jority of individuals in the Litchfield region are immature. A mature 
female operculum with appendages, except for the terminal pair, is shown 
in plate 8, figure 1. The most important features of this specimen are 
the two pentagonal anterior pieces separated by sutures from the two 
halves of the operculum, and the two imbricating unpaired lobes, each of 
which expands slightly at the posterior extremity and terminates with two 
diverging, acute lateral lobes. The two tubular organs which were first 
tecognized by Holm in E. fischeri, are here seen as two black 
