46 Annals of the Carnegie Museum. 



24. Productella coloradensis var. plicata Kindle. 



Productella coloradensis var. pUcatus Kindle, Bull. U. S. Geol. Surv., No. 391, p. 



18, PI. IV, figs. 9-12. 



The writer obtained two well-preserved specimens from the upper 

 portion of member number 5, north of Three Forks, which show the 

 detailed characters of this variety. 



25. Productella laminata Kindle. (Plate VIII, fig. 6.) 



Productella lantinatus Kindle, Bull. U. S. Geol. Surv., No. 391, p. 18, PI. IV, figs. 



13-14- 



About ten specimens from the upper portion of member number 5 

 in the collections of Dr. Raymond and the writer were identified as 

 of this species. 



26. Productella cj. depressa Kindle. 



Productella depressa Kindle, Bull. U. S. Geol. Surv., No. 391, p. 20, PI. V, fig. 5, sa. 

 Five specimens collected by Dr. Raymond from member number 5 

 are referred by the writer, with some doubt, to this species. 



27. Productella cf. arctirostrata Hall. 



Productella arctirostrata Hall. Pal. N. Y., Vol. IV, 1867, p. 182, pi. 26, figs. 16-23. 



About thirty poorly preserved specimens from limestone member 

 number 4, and the overlying yellow shale of number 2 are referred to 

 this species with some doubt. Most of the specimens have continuous 

 plications, rather than a row of elongate spine-bases as shown in most 

 of the figures of this species. 



The following rather unsatisfactory determinations of poorly pre- 

 served Prodiictellas are merely listed here without comment. They 

 are all from the upper part of member number 5 or from number 4. 



Productella cf. hirsiita Hall, a rather common form. 



Productella cf. hirsutiformis Walcott, a very rare form in the col- 

 lections. 



Productella cf. subaculeata Walcott, a rare form. 



Productella cf. subalata Hall, a fairly abundant form. 



This completes the description of the Brachiopoda from members 

 numbers 4 and 5 of the Three Forks formation. A description of the 

 Pelecypoda of the formation is in preparation for a later paper in this 

 series. 



