•J74 CAR«ONlKf:KOU8 FOKMATIONS AND KAUNAS OF COLORADO. 



indeterminable. Tlu' surface is sliown to he i)n'tlily iniiik('(l with delicate growth 

 lilies. 



Possibly the fcssil referred to iiinoiig the Upper C'arhoiiifcn-ous forms as /S'///'/^;- 

 </<ijiora .sp. beloiigs to S. surcularia.. 



LvvaJiiy iiinl horizon. — San Juan reoion (station 2381); Ouray limestone. 

 Crested Butte district (station 3358); Leadville limestone. Salida region (station 

 :.'26n): Leadville limestone. 



ECHIN01)ER]MATA. 



KHODOCRINUS Miller, 1821. 

 Khodocrinus sp. 



Although the stems and plates of crinoids are by no means rai'e in the Lower 

 Carboniferous limestones and cherts of the San Juan region, only a single complete 

 specimen has come to hand. This was obtained from a localit}' in the Engineer 

 Mountain quadrangle and probably belongs to the genus Rhodocrlnus. It is pre- 

 served as a cast (external and internal), but the definition of the plates is poorly 

 shown, and their number and arrangement has not been made out. I have been 

 unable to ascertain the exact specific relationship of this crinoid, but it appears to 

 belong in the same group as Rli. 'Idrhyl. The height is about 14 mm. and the diam- 

 eter 11 mm. The general shape was cvlindrical, the base and top being nearly flat, 

 and the lateral surfaces normal to them. The lateral and upper surfaces were orna- 

 mented with knobs and prominent protuberances. 



Locality and fiorizmi. — San Juan region (station 2382); Ouray limestone. 



PLATYCRINUS Miller, 1821. 

 Platyceinus sp. 



In the Engineer Mountain quadrangle (stations 2382 and 2386) occur several 

 convex subpyramidal plates, the largest having a diameter of 10 mm., which are 

 probably the basal plates of some unidentified species of Platycrinus. 



Locality and horizon. — San Juan region (stations 2382 and 2384); Oura3Mime- 

 stone. 



BRYOZOA. 



FENESTELLA Lonsdale, 1839. 



Fenestella sp. 



Portions of fronds of fenestelloid bryozoa are not uncommon in the material 

 collected in the San Juan region. They are, however, fragmentarj^ and poorly 

 preserved. At least three forms have been discriminated, and though I have not 

 ventured to identify them definitelj', the species are mentioned with which they seem 

 to be nearl}' related. 



