14 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 134 
Russian species are not good, and the good available pictures, those 
of Tschernyschew, are often provided with a stratigraphic assign- 
ment of dubious value. 
DISCUSSION OF THE SPECIES 
Meekella in the Oregon fauna appears to have little value in cor- 
relating these rocks. The species represented is unlike any of the 
European species but is most like M. striatocostata (Cox) from the 
Wolfcampian in Kansas. It also resembles M. difficilis Girty from 
the Bone Spring and Leonard formations of Texas and M. skenoides 
Girty from the Word and Delaware Mountain formations of Texas. 
Of the two species of Chonetes in the Oregon fauna, one is like 
C. timanicus of the Schwagerina zone of the Timan, and the other, 
the larger of the two, is most like three Word species: C. deliciasensis 
King, C. monosensis Cooper, and C. phosphoriensis Branson. The 
indication is thus of a post-Leonardian age. The fragmentary Chone- 
tinella is not of much help because it cannot be related to known spe- 
cies. The last chonetid from Oregon is Paeckelmannia cf. C. alatus 
Stuckenberg which has no known counterpart in American described 
species but is reported from the Artinskian of the Urals. 
The one species of Leptodus? from Oregon is an equivocal form. 
Comparison with numerous specimens in the National Museum col- 
lection suggests that it is most related to some of the small subconical 
forms common in the upper part of the Leonard formation of the 
Glass Mountains. These are undescribed; consequently, nothing 
definitive about the relationships of the Oregon species can be stated. 
The productoids in the Oregon fauna are a numerous and varied 
group. They also contain a number of genera and species that have 
considerable value in correlation. Some uncertainty, however, exists 
in the stratigraphic assignments of some of the Russian species. In 
general, the present assigned stratigraphic levels of these are far 
lower than similar species in North America. 
Avonia oregonensis Cooper, n. sp., is similar to A. tuberculatus 
(Moeller) from the “Schwagerina’ horizon in Russia. In North 
America A. subhorrida (Meek) from the Phosphoria formation 
appears to be a related species. Other related species occur in the 
Word formation, and similar forms appear in the Leonard but the 
latter are smaller and probably unrelated. They do, however, indicate 
that the genus has a fairly long range. 
Two species of Antiquatonia occur in the Oregon fauna. This 
genus is not yet well known in North America but indications in the 
