'rRii.oiirn.s OK THK CiiA/v Limes roNK.. '3~)o 



a small tubercle on the middle of the ring. Eye lobes small, and far 

 back. Free cheeks missing. 



The following are the measurements of the best specimen. Cranid- 

 ium : length 10.5 mm.; width between eyes, 8 mm.; length of gla- 

 bella, 8 mm.; width of concave border, 2 mm. 



This species differs from Pro'ctiis parviusculiis Hall by showing gla- 

 bellar furrows and in the presence of a tubercle in the neck ring. The 

 general shape of the glabella is about the same. It somewhat resem- 

 bles Pro'etiis lalimari^i/iatus Weller from the Trenton of New Jersey, 

 but the glabellar furrows are not so deep and it has only two instead 

 of three pairs. 



Locality. — In a coarse reddish limestone at Chazy, New York. 

 Type specimens in the Cornell University Museum, catalogue number 

 5768. 



Family LICHADIIXF Barrande. 



Genus LICHAS Dalman. 



Subgenus Pi.atvmetopus Angelin. 



Platymetopus minganensis Billings. (Plate 14, figures 1-3.) 



LJthas Jllinganinsis Hillings, 1865, Paleozoic Fossils Canada, volume i, page 181, 

 figure id'^a-l). 



Lichas Champlainensis Whitfield, 1S81, Bulletin American Museum Natural His- 

 tory, volume I, number 8, page 342, plate 33, figures 6-8. 



In the absence of a complete specimen of either of the above spe- 

 cies, it may seem unwarranted to put the two together, but there 

 seems to be sufficient evidence that there is but one species commonly 

 met with in the Chazy, and, as all the cephalons collected belong to 

 Billings' species and all the pygidia to Whitfield's Lichas cliamplain- 

 ensis, there seems to be a strong probability that the two aie one 

 species. 



Billings, in 1865, described the glabella of a Z/V/^/-f from the Chazy 

 or Black River limestone of Large Island in the Mingan Islands. 

 Whitfield, in 1881, described a pygidium from the Birdseye limestone 

 (now known to be dolomite layers of the Chazy) at Isle La Motte, 

 Vermont. The glabellae are very commonly met with at Valcour Is- 

 land, Chazy and elsewhere, and, although there is some variation, 

 due to the state of preservation, all can be readily referred to L. viin- 

 ganensis. Pygidia are not so common and there is more variation, 

 but there are specimens from the buff-colored layers, at Chazy, which 



