DESCRIPTIONS OF SPECIES. 271 



Zapheentis? sp. h. 



At Leadville (station 2374) occui's a form which is certainly a zaphrentoid coral, 

 but regarding whose affinities it is impossible to affirm anything definite, so little in 

 the way of structure, beyond the mere presence of septa, being discernible. In 

 general form these corals are nearly straight and exhibit extreme inequalities of 

 growth. The greatest diameter found in our material is 12 mm., and the length 

 must have been 30 mm. or more. The number of septa I have not been able to 

 ascertain. 



Locality and hwizon. — Leadville district (station 2374); Leadville limestone. 



Zapheentis? sp. c. 



This is the Axojphyllum rudis of White." As the impression is that of the out- 

 side of the corallum, preserving only the shape, neither the genus nor the species 

 can be ascertained. 



Locality and horizon. — Pebbles of Millsap limestone (?)in the Red Beds con- 

 glomerate, Larimer County (station 2364). 



MENOPHYLLUM Milne Edwards and Haime, 1850. 



Menophyllum uleichanum n. sp. 



PI. I, figs. 1, 2. 



1900. Streptelasma sp. (pars) Girty, U. S. Geol. Surv., Twentieth Ann. Rept., pt. 2, p. 38. 

 Ouray limestone: Durango quadrangle (not Crested Butte region), Colorado. 



At several localities in the Mississippian strata of southwestern Colorado a well- 

 characterized zaphrentoid coral occurs in considerable abundance. A somewhat 

 careful search amongst our series of American forms has only led to the conviction 

 that the species is as yet an undescribed one. Its generic affinities seem to be clearly 

 with the genus Menophylktm. Several years ago I described from Yellowstone 

 National Park a species of Menopkylhmi whose horizon can not be far different from 

 that to which the Colorado specimens belong. Menoi^hyllum, excavatxim is, up to the 

 present, the only member of the genus known from American strata; nevertheless, the 

 descriptions of some of the forms referred to Zaphrentis are such as to warrant the 

 suspicion that they really belong to the less common tj^pe. Menophyllum v.l/richanum 

 differs from 31. excavatum., as it differs from most of the American species of 

 Zaphrentis, in the large number of its septa. With due consideration to its smaller 

 size, it may be said to I'ival in this i-egard Zaplvrentin 'nndtUamella, Z. stanxhuryi, 

 and Z. excentrlca, all which forms, it will be remembered, are peculiar to our Rocky 

 Mountain faunas. 



a. U. S. Geol. Geog. Surv. Terr., Bull., vol. 6, 1879, p. 215. 



