240 The American Geologist. April, 1900 
not identical with "F. intermedia," we would sugfrest the 
name: " Fenc Stella allniqiicrqiicana . ' ' 
7. Cystodictya sp. 
A rather large bifurcating frond occurs in a few poorly pre- 
served specimens that in most respects resemble C. carbonaria 
Meek. The species differs, however, in the fact that the pores 
are larger and less numerous. In a frond 35 mm. wide there 
are not more than eight rows of pores and about eight pores 
occur in a lengthof 5m m. The specific identity must be left till 
better preserved material can be secured. 
Bkachiopoda. 
*8. Lingula tigJiti Herrick, Bull. Uenison Univ., vol. II, 
p. ? 
The faintly preserved specimens we have from the shale 
more nearly resemble this than any other Carboniferous Lin- 
gula. 
*9. Discina nitida Phillips. 
This familiar form occurs sparingly in the shale and adja- 
cent strata. 
*io. Martinia lineata Martin. 
Abundant throughout the entire Carboniferous series in 
New Mexico. 
*ii. CJionctes niesoloba Norwood and Pratten. 
So far as we know this species is found only in the lower 
part of the series, that is in mid-Carboniferous and upper Car- 
boniferous time but it does not rise above the Coyote sand- 
stone to mingle in the Permo-Carboniferous facies. 
* 1 2 . A thyris argcntca { siditilita ) Shepherd. 
Found throughout the series but is represented by a gross 
variety in the Permo-Carboniferous that may deserve a dif- 
ferent name. 
^13. Derbia {Hejnipronites) crassiis Meek and Hayden. 
The efiforts to revise this genus do not clear the matter up 
sufficiently to enable us to be sure of the specific name for this 
common form. 
*I4. Prod lie til s cor a D'Orb. 
A species which has been known as Productus prattenianus 
