RAYMOND: SOME \ I \\ ORDOVICIAN TRILOBITES. 277 



lobes, and in the pygidium, which has fewer and curved, instead of 

 straight , ribs, 



Horizon and Locality: Aside from the typical region, the 

 Catawba Valley, Va., I have also found this species at Saltville, id 



the lower part of the Athens, and in yellowish calcareous shales near 

 the railroad station at Hull's Gap, Tenn. Holotype 1 ,o9S M. C. X. 



Paratype M. C. Z. 1,599. 



Kndymioniidae, fam. nov. 



This family is erected for species which resemble the Raphiophoridae 

 in the possession of narrow free cheeks without eyes, and a short 

 Ampyx-like pygidium, but lack a glabellar spine. The typical genus 

 is Endymionia. The family may be briefly characterized as follows: — 



Hypoparia with narrow dorsal free cheeks but no eyes, no glabellar spine, 

 seven segments in the thorax, short ampycid pygidium. 



Ordovician, Quebec, Newfoundland, Scotland, and Sweden. 



Endymionia Billings. Cephalon evenly convex with large glabella divided 

 into three parts by a pair of longitudinal furrows. Axial lobe of thorax about 

 one third the total width. 



Type, Endymionia mecki Billings. 



Lower and Lower Middle Ordovician, Quebec, and Newfoundland. 



Anisonotus, gen. nov. Cephalon irregularly convex, glabella small, with 

 lateral furrows indicated by pits. Axial lobe of thorax narrow. 



Type, Shumardia glacialis Billings. 



Lower and Lower Middle Ordovician, Newfoundland, Scotland, 

 Sweden. Other species which appear to belong to this genus are 

 Anisonotus hornci (Nicholson and Etheridge) from the Balclatchie 

 (Llandeilo) of Scotland and A. obtusus (Moberg and Segerberg) from 

 the Ceratopyge shales of Sweden. 



Endymionia schucherti, sp. nov. 



Endymionia meeki Billings (partim). Palaeozoic foss. Canada, 1865, 1, p. 281. 



Specimens of this species are larger than those of E. meeki, with smooth 

 rather evenly convex cephalon, and flattened thorax and pygidium. Lengths 

 of cephalon, thorax, and pygidium in the proportion 2:2:1. 



