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102 F. Springer—Burlington Limestone in New Mexico. 
SYMBATHOCRINID &. 
Symbathocrinus ——, 2 species undetermined. 
BLASTOIDEA. 
Granatocrinus ——, 2 undescribed species. 
Troostocrinus , 1 undescribed species. 
Codaster , 2 undescribed species. 
Of the crinoids the most abundant species is Actinucrinus 
proboscidialis, which is found in all its varieties of ornamenta- 
tion, size and form. This is probably the most characteristic 
fossil of the Lower Burlington Limestone, at the typical lo- 
cality. It is subject to considerable variation in the features — 
alluded to, yet is a very well marked species. Upon compar- 
ing a large number of well preserved specimens from Lake 
Vallev, 1 am constrained to believe that A. Dalyanus, de- 
scribed by Mr. Miller from this locality (Jour. Cin. Soc. Nat. 
Hist., Dec. 1881), is only A. proboscidialis. Next to this the 
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ton—the first and last of these, however, being among the — 
rarer species at Burlington. Every one of the species named 
noids will entertain the least doubt that the rocks which pro- 
duce the species above enumerated are of the age of the Lower 
Burlington. 
The Blastoids, although all of undescribed species, are of the 
types which prevail in the lower beds of Burlington. 
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uals were observed. he Rhodocrinides are comparatively — 
common, while the Platycrinide and Actinocrinide are numer — 
ous in individuals as well as species. 
h 
e collection is remarkable for the entire absence of Bato- : : 
crinus, which is one of the most common forms in the lower 
beds at Burlington. All observations as to the comparative — 
_ abundance or the absence of certain forms must be taken with — 
- much allowance, for it has been found that here, as at Burling- 
ton, species which are very common at one locality, are rare OF 
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a 
wholly wanting at another not far distant; and while the facts A 
above stated may be taken as fairly accurate indications as t0 ~ 
