750 BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 



Mi i/xuremcnts.- 



Diameter of the peristome 0.10-0.12 mm. 



Diameter of the apertura 0.08 mm. 



Distance between the peristomes 0.40 mm. 



Separation of the peristomes 0.50-0.60 mm. 



Length of the peristome 0.20 mm. 



Width of the segments 1.00 mm. 



Affinities. This species differs from Crisulipora promimens in its pluriserial 

 zoarium. It differs from Crisulipora fabcllata in its dorsal surface, which is much 

 more rugose, and in its nonflabelliform but fusiform and never bifurcated segments. 



Occurrence. Vicksburgian (Marianna limestone) : One mile north of Monroe- 

 ville. Alabama (rare) ; west bank Conecuh River, Escambia County, Alabama 

 (rare). 



Cotypes.C&i. Nos. 65389, 65390, TJ.S.N.M. 



CRISULIPORA FLABELLATA. new species. 



Plate 154, figs. 21-24. 



Description. The segments are pluriserial, flabellate. bifurcated. The tubes 

 are distinct, cylindrical, arranged in irregular quincunx, striated; the peristome 

 is thin, orbicular; the peristomie is well developed only on the lower tubes. The 

 ovicell is enormous, globular, enveloping all the tubes of a segment ; the oeciostome 

 is very small. The dorsal face (basal lamella) is ornamented with transverse, very 

 widely scattered striae. 



Diameter of the peristome 0.12 mm. 



Distance between the peristomes 0.60 mm. 



Separation of the peristomes 0.50-0.60 mm. 



Width of the segments 1.6 mm. 



Affinities. This species differs from Crisulipora rugosodorsalis in the flabellate 

 (and not fusiform) form of its segments, and in its dorsal face ornamented with 

 much smaller wrinkles. We learn from Miss Robertson's work that the number of 

 the embryos is very great in the ovicell of Crixnlipom. On the other hand, if 

 we. note the great size of the ovicell of this species we are surprised at the rarity 

 of the specimens found. Their extreme fragility and their special mode of habitat 

 on floating algae must be the cause of this. 



Occurrence. Vicksburgian (Marianna limestone) : One mile north of Monroe- 

 ville, Alabama (rare). 



Cofypes.Czt. Nos. 65388, 65483, U.S.X.M. 



CRISULIPORA GRANDIPORA, new species, 

 riate 155. tigs. 7-11. 



Description. We know only the biserial segments of the base of this species. 

 The tubes are very long and very lui'gf, ornamented with small transverse widely 

 -paced wrinkles; the peristome is thick, orbicular, salient. 



Measurem en ts. 



