872 AnNAI.S OI IHF. CARNF.f;iF. MUSKUM. 



are many specimens of the bulbous part of the glabella of a new 

 SphcBrocorphc. In spite of the excellent state of i)reservation of these 

 small globular j^ortions of the trilobite, the writer has not been able 

 to find a specimen which, on development, would show more than 

 the glabella and a ])ortion of a fixed cheek. Species of Sphccrocorphe 

 are, however, so rare in the American faunas, that it is thought worth 

 while to describe what material we have and call the attention of col- 

 lectors to this locality. 



Description". 



Glabella small, the bulbous frontal lobe occupying fully two thirds 

 of the length. Back of the frontal lobe the two glabellar furrows 

 meet on top, making a complete furrow over the glabella. Behind 

 this are two small glabellar lobes and then the neck furrow, behind 

 which is a narrow neck ring. Fixed cheeks short, triangular, but the 

 genal angle is not well enough preserved to show whether or not it 

 bore a spine. Eye rather large, projecting forward and about opposite 

 the posterior glabellar lobes. Neck furrow extends across the fixed 

 cheeks. Whole surface very finely tuberculated. 



Measurements. — A cephalon : length 4 mm.; width 4.5 mm.; 

 length bulbous part of glabella, 2.5 mm.; width 2.5 mm. Another: 

 length 2 mm.; length bulbous part, 1.5 mm.; width 1.5 mm. There 

 are one or two which are a trifle larger than the first one given above. 



Locality. — So far the species has been found only in the middle 

 Chazy limestones in Mr. Robert McCollough's sugar bush, a half 

 mile south of Chazy village, New York. 



Genus SPH.F:REX0CHUS Beyrich. 

 Sphaerexochus parvus Billings. (Plate 14, figure 22.) 



Tiilobite, genus undetermined, IJillings, 1S59. Canadian Naturalist and (ieologist, 



volume IV, page 468, figure 36. 

 SpJuerexochns parvus Billings, 1865. Paleozoic Fossils Canada, volume I, page 180, 



figure 160. 



In spite of the fact that this little species is one of the most com- 

 mon fossils met with in the Chazy limestone, the glabella is the only 

 part we find. Out of fifty specimens, now before the writer, only two 

 show anything more than the glabella. One retains the cast of the 

 posterior part of the left fixed cheek, and the other has the whole of 

 the right fixed cheek showing the position of the eye. 



