EARLY TERTIARY CHEILOSTOME BRYOZOA. 49 



by the oral aviciilarium. The apertiira is elongated, ovoid, very- 

 oblique. The oral aviculariiim is large, transverse, salient, with the 

 beak strong and curved; it is provided with a pivot and a large 

 mandible, more or less spatulate. On the frontal there are two 

 small, elliptical avicularia with round mandible. 



Occurrence. — Vicksburgian : One mile north or Monroe ville, Ala- 

 bama (very common). 



Type.— C2.t. No. 62597, U.S.N.M. 



METROCRYPTA, new genus. 



{Metra^ womb, in reference to the ovicell; cryptos^ hidden.) 



The frontal is a tremocyst with tubules. The rimule-spiramen is 

 wide and of very little depth. Ovicell unknown. 



Genotype. — Metrocrypta hucculenta^ new species. Jacksonian. 



The ovicell of this genus is unknown ; it is therefore very doubtful 

 that the genus should be introduced into this family. The oral avic- 

 ularium is very rare; however, its presence seems to us the best 

 character for classification. 



METROCRYPTA BUCCULENTA, new species. 



Plate 5, fig. 2. 



Description. — The zoarium is free, cylindrical, bifurcated. The 

 zooecia are elongated, large, little distinct; the frontal is convex, 

 porous, formed of a tremocyst placed on a thick olocyst. The peri- 

 stomice is somewhat elongated, oval, its lower point formed of a wide 

 rimule-spiramen; the peristomie is somewhat salient; the apertura 

 (interior) is much smaller, orbicular, very oblique. The oral avic- 

 ularium is very rare; it is quite large, prominent, triangular, adja- 

 cent to the peristomice, provided with a pivot placed very low. 



. -r. • . ■ / ^ • N fAi»e= 0.30-0.35 mm. 

 Measurements. — Feristomice (exterior) / „ „ „ 



'^ ^ \lpe=Q.2>0 mm. 



. ^ /• . • X fAffl=0.15 mm. 

 Apertura (mterior) , „ . „ 

 ^ ^ ' [m=0.15 mm. 



„ . (Z2=1.00 mm. 

 Zooscia , - „j. 



|fe=1.25 mm. 



Occurrence. — Middle Jacksonian (Castle Hayne limestone) : Wil- 

 mington, North Carolina (common). 

 Type.— Oiii. No. 62598, U.S.N.M. 



OCHETOSELLA, new genus. 



{Ochetos^ small canal.) 



The ovicell is hyperstomial and deeply embedded in the distal 

 zooecium. The rimule-spiramen is replaced by a small canal sup- 

 52091°— 17 4 



