IOWA ACADEMY OF SCIENCES. 
81 
No. of Nodes. axial segments occupied. 
1. 1st. 2d. (?) 3d. 
2. 3d. 4th. 5th. 6th. 
3. 7th. 8th. 9th. 10th. 
4. 10th. 11th. 12th. 13th. 14th. 
5. 14th. 15th. 16th 17th. 18lh. (?) 19th. 
The following table sets forth the facts observed graphically 
and in detail. It will be noted that not a single segmental 
line of the first twenly- three is unoccupied by a tubercle. No 
law obtains as to the successive number of the intervening 
segments. For comparison the sequences of nodes on two 
described species are inserted. Of the distinct trends observable 
in the grouping of the nodes that toward the formula of E. 
ornatus is most largely represented in the specimens at hand. 
Geological Laboratory, Cornell College, December 31, 1895. 
NUMBER OF AXIAL ANNULATIONS. 
"^No. 17. E. ornatus, H. & W. tNo. 26. E. punctatus, Murcb SJuria. PI. Ill, fig. 6 
$No. 31. E. thresheti, Foerste. 
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