'rkiLomrKs OF THK Cha/v Limestone. 361 



mm. wide at the genal angles. With the exception of its incomplete 

 thorax this small specimen has all of the characters of the adult, in- 

 cluding spines. It does however shdw a few adolescent characters. 



Fu;. 3. Gldphurtis piistiilatus W'akoll. (Jutline of a young specimen with eight 

 thoracic segments. Notice the anterior and marginal position of the eyes and the 

 segmentation of tlie jiygidium. Enhirged sixteen diameters. 



Cephalon. — The free cheeks are smaller than in the adult and the 

 eyes are situated on the very edge of the cephalon. The glabella is 

 very convex, but the glabellar furrows are the same as in the adult. 



Thorax has eight segments. 



Pygidium shows seven or eight pairs of ribs on the pleurce and four 

 or five annulations on the axis. (Figure 3.) 



This species differs so widely from all other known species that it 

 can hardly be compared with any particular one. The glabella some- 

 what resembles that of Odontopleiira parvula ^^'alcott but the eyes are 

 smaller, much further forward, and the free cheeks much more convex. 



Locality. — The species occurs both in the reef material and in the 

 coarsely crystalline limestone which accompanies it at Valcour Island, 

 Sloop Island, Chazy, Cooperville, N. Y., and Isle La Motte, Vt. The 

 figured specimens are in the writer's collection and are all from Chazy, 

 New^ ^'ork. 



