114 NEW YORK STATE MUSEUM 



PLATE 2 



Pseudoniscus roosevelti sp. no v. 



p. 89 

 {See plate 1) 



FIG. 



1 An essentially entire, somewhat distorted specimen, x 3. 



2 A cephalothoracic plate somewhat flattened; showing the 



ornament of the posterior margins and the length of the 

 genal spines, x 2. 

 From the black Salina shales, Monroe county, N. Y. 



3 A specimen with the posterior parts restored in outline. 



This is an impression of the lower surface_, and the head- 

 shield shows radiating articular (?) impressions depart- 

 ing from a central oral (?) groove. x2. 

 From the Eurypterus dolomites, Jerusalem hill, Herkimer co. 

 N. Y. 



Emmelzoe decora sp. nov. 



p. 95 

 {See plate 3) 



Fig. 



4 A group of indiyiduals in more or less disjointed condition, 



all natural size. 



5 The most complete individual of this group. The seg- 



ments of the abdomen have here been reversed and 

 thrown forward, a quite usual condition among these 

 crustaceans, and they protrude, hence, from the anter- 

 ior extremity of the carapace. The abdominal segments 

 are given an abnormal width by flattening, and the 

 character of the telson and cercopods is not clearly de- 

 fined. This figure shows the peculiar reticulate imbri- 

 cate surface ornament of the segments. x3. 

 6-11 Left and right carapace valves, showing the character 

 and variability of the surface markings and the well 

 developed eye nodes. These are all enlarged one diam- 

 eter with the exception of fig. G, which is thrice actual 

 size. The ridges of the surface are seen to be quite vari- 

 able in number and size, finer and more crowded on the 

 younger examples. 

 From the black Salina shales, Monroe county, N. Y. 



