CHEMUNG GROUP. 



183 



No. 4. Chemung atrypa. This is the largest of all the species of Atrypa found in the district. The 

 casts are given, as being more numerous than the shell, and therefore more likely to aid the observer 

 in tracing or discovering the group. 



No. 5. This convolute shell is quite imperfect, but is given to direct attention in search of better ones, and 

 to discover those of the genus Clymenia, of which there are a number of species in England, be- 

 longing to the Devonian system. It is not unlikely that this may be one of the species of that genus. 



No. 6. Tricircled encrinite. This name, it appears, W8is given to this species by the late Prof Eaton. 

 It consists of three different sized crinoid joints, grouped together, and is a very characteristic fossil 

 of this group. It is found in many localities, such as the quarry at Greene, those near Binghamton, 

 the creek near Factoryville, etc. It is usually replaced with lamellar carbonate of iron, colored 

 yellow or buff There are also one or more similar species in this group, none of which were 

 observed to exist in lower ones. 



Chemung uphantenia (U. chemungensis). 



The specimen, from which the very remarkable figure represented on wood-cut 50 was 

 copied, is in the State Collection. It was found near the south end of the Ithaca and Owego 

 railroad, by Mr. Leech, the former engineer of that road, who loaned it to the State, subject 

 to his order. The wood-cut exhibits the whole length of the fossil, as it exists in the specimen. 

 It consists of a series of broad rays, very thin, almost wholly superficial, which diverge from 



