BERRY: A NEW MATONIDIUM FROM COLORADO 287 
sori to each pinnule, Schenk’s admirable figures* show eight or 
nine pairs, and they are very numerous in Trautschold’s figures of 
the Russian material.t The most elongate and largest pinnules 
of the Colorado species bear but five or six sori on the distal half 
of the lamina and but six or seven on the proximal half, while the 
most abundant remains are those with short and broad pinnules 
bearing three sori on their distal halves and four sori on their 
proximal halves. 
I regard these features and others to be mentioned as of specific 
value and propose that the Colorado specimens be discriminated 
as 
Matonidium americanum sp. nov. 
Matonidium Althausiit Cockerell, Jour. Wash. Acad. Sci. 6: 111. 
f.2. 1916. [Not (Dunker) Ward.] 
Cycadospadix ? sp. Cockerell, Idem. 110. f. 1. 
This species also includes formswhich Cockerell suggested might 
represent Todites, and Weichselia or Cladophlebis. The equiset- 
aceous stems mentioned as probably representing Eguisetum 
Burchardti (Dunker) Brongniart are probably fragments of the 
large stipes of Matonidium. The striations are somewhat irregu- 
lar and do not alternate at the nodes, there are no traces of nodal 
sheaths and the apparent jointing appears to be due to shrink- 
age cracks of a collapsed and consequently furrowed stipe, since 
a similar state of preservation is seen in the objects that were 
referred to Cycadospadix, which latter are clearly the apical portions 
of Matonidium stipes and only most superficially suggestive of 
Cycadospadix, and strictly comparable with similar remains of 
Matonidium Alihausii as figured by Schenk,t Ettingshausen§ and 
Seward. || 
Matonidium americanum may be characterized as follows: 
Digitate fronds with the same habit as Matonidium Althausu 
or the existing Matonia pectinata, with long stout stipes about I 
cm. in diameter as preserved in a partially flattened condition. 
Stipe surface somewhat regularly furrowed, but whether this was 

* Palaeont. 19: 220. pl. 27, f. 5; pl. 28, f. 1, 2; pl. 30, f. 3; pl. 42, f. rz. 1871. 
+ Nouv. Mém. Sci. Nat. Moscou 13: 28. pl. ro, f. 3. 1870. 
t Palaeont. 19: pl. g2 f. 7. 1871. 
§ Abh. k. k. Geol. Reichs. 13: pl. 5. f. 4, 6. 1854. 
|| Jurassic Fl. 1: pl. rr, f. 1. 
