lariter dispositi, inferne inter se 4-6 mm. distantes, part- 
ibus apicalibus (?) congesti. Fructus ignoti. 
Plant of apparently loosely caespitose habit with un¬ 
branched, flexuous axes averaging 3 cm. in length (prob¬ 
ably incomplete) and 1-2 mm. in width, bearing whorls 
of from two to four leaf-like appendages. Leaf-like ap¬ 
pendages flat, stiff (?), basally dichotomous, with the two 
segments equal; segments truncate-linear, 5-8 mm. long 
and 1—2 mm. in width. Whorls regularly disposed, 4-6 
mm. apart, except on the terminal (?) portion of the axes 
where the whorls are more closely packed and the leaf¬ 
like appendages are more or less incurled. Fructifications 
unknown. 
Paleobotanical Collections, Princeton University, No. 24101; 
Beartooth Butte formation, Lower Devonian, Beartooth Butte, Wy- 
Geological considerations 
The type specimen of this genus and species was col¬ 
lected by Dorf during the summer of 1934 from the 
Lower Devonian Beartooth Butte formation (6) at Bear¬ 
tooth Butte, Wyoming. The fieldwork in this area was 
conducted under the auspices of the William Berryman 
Scott Fund of Princeton University. 
The Beartooth Butte formation has been shown (6) 
to be a local channel-fill deposited in quiet, shallow, non¬ 
marine water under estuarine conditions. The lens¬ 
shaped deposit is separated from the underlying Bighorn 
dolomite of Upper Ordovician age by a marked discon- 
formity, and is overlain disconformably by the Middle 
Devonian Jefferson limestone. 
Plant remains were found in the channel-fill in direct 
association with a large Lower Devonian fauna of ostra- 
coderms, arthrodires, elasmobranchs, eurypterids, and a 
questionable dipnoan (2,3,13). Five distinct types of 
plant remains have previously been described from this 
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