DESCRIPTIONS OF SPECIES. 275 



One of these, which occurs at station 2382 and probably also at station 2385, is 

 allied to F. serratula Ulrich. It is characterized by its regular, fine mesh, and in 

 this regard has about the proportions of the latter species, but seems to differ in 

 having the dissepiments nearly as large as the branches, and not depressed, as they 

 are represented in the figures of the type specimens. The fenestrules are subrec- 

 tangular and somewhat longer than wide. The reverse side is covered with strongly 

 elevated pustules on both branches and dissef)iments. There are from 5 to 6 zoo?cia 

 opposite two fenestrules. 



Another form, one whose closest allies I am unable to point out, is found at sta- 

 tion 2382, and probably also at station 2386, where it is abundant. The branches 

 divide frequently so that the fenestrules are of unequal size. Their shape is ellipti- 

 cal, with length about twice the breadth, to nearly circular. There are about 11 in 

 the space of 10 mm. The dissepiments are nearly as wide as the branches them- 

 selves, and ))oth seem to lack ornamentation of anj^ kind. The zocBcia are small and 

 numerous, about i occurring opposite each f enestrule. When compared with the 

 species last described, this one is larger and coarser, without the pustules with which 

 the surface of the other is covered, and with c/omparatively smaller and more 

 numerous zocecia. 



There is also a third species which seems to be intermediate between F. limitar'is 

 &nA. F. filintriata. It is I'epresented by an external cast of the reverse side, which 

 shows the surface to be ornamented with delicate but sharp strife. The fenestrules 

 are rectangular in shape, three or four times as long as wide, and with some 8 or 9 

 in a space of 10 mm. The dissepiments are nuich more slender than the branches. 

 This species also occurs at station 2382. 



Locality and harizon. — San Juan region; Ouray limestone. 



BATOSTOMELLA Ulrich, 1890. 

 Batostomella sp. 



In the San Juan region a few imperfect specimens were obtained which probably 

 can be referred to the genus Batostomella. The material is so poor that no specific 

 identification is suggested. 



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



FISTULIPORA McCoy, 1849. 



FiSTULIPORA? sp. 



From the cherts at station 2382 in the San Juan region a specimen was obtained 

 showing, as an external cast, a large ramose zoai'ium of what was probabl)^ a fistuli- 

 poroid bryozoan. It is of course indeterminable. 



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



