NORTH AMERICAN EAKLY TERTIARY BRYOZOA. 465 



SMITTINA SORDIDA, new species. 

 Plate 59, figs. 15, 16. 



Description. The zoarium incrusts shells. The zooecia are elongated, distinct, 

 separated by a furrow or a very thin salient thread, vaguely elliptical: the frontal 

 is convex and formed by a thick pleurocyst, smooth or finely granulated. The 

 peristome is salient and often bears two quite prominent lateral lips ; the peristomice 

 is elongated, irregular ; the lyrula is little salient, acute, accompanied sometimes by 

 two cardelles. The ovicell is large, salient, placed on the distal zooecia ; it is hyper- 

 stomial and opens largely into the peristomie above the apertura ; it is formed of a 

 large area bordered by a salient collar. The small oral avicularium is triangular, 

 the beak directed above. Quite frequently, a small frontal avicularium. salient and 

 round, is placed laterally. 



-r, . , . \hpe=0.15 mm. . \Lz = 0.55-0.70 mm 



Measurements. Peristomice { , ^ Zooecia , 



Vpe=0.11 mm. 1 h = 0.3o-0.40 mm. 



Variations. This species is not beautiful ; its aspect is sordid; the zooecia 

 have neither regularity nor symmetry. On the same fragment there are some 

 zooecia with notched peristomes and other zooecia with perfect peristomes. At 

 the same time there are some fragments entirely deprived of frontal avicularium. 



This species is deprived of areolae; this is the reason that we suppose its 

 frontal to be a pleurocyst ; an olocyst would never have this irregularity and would 

 be absolutely smooth. The presence of cardelles and of the lyrula is as usual for 

 the genus. The very small number of specimens collected has not permitted us 

 to study the interior to clear up the mystery of the constitution of its frontal. 



Occurrence. Upper Jacksonian (Ocala limestone) : One and one-half miles 

 above Bainbridge, Georgia (rare) ; below the Plant System railroad wharf, Bain- 

 bridge, Georgia (rare). 



Holofype.Cat. No. 64130, U.S.N.M. 



SMITTINA COPHIA, new species. 

 Plate 92. figs. 21-23. 



Description The zoarium is hollow, unilamellar, cylindrical; it incrusts very 

 small algae. The zooecia are distinct, elongated, claviform, separated by an espe- 

 cially thick mural rim; the frontal is almost flat and formed of a pleurocyst with 

 interareolar costules. The peristome is wide, salient, thick; the peristomice is 

 elongated, elliptical; a very small lyrula is visible at the base of the peristomie. 

 The ovicell is globular, quite salient, hyperstomial, placed on the distal zooecia ; it is 

 formed of a very large area quite finely porous, surrounded by a smooth, salient 

 collar which surrounds it like a cap; it opens into the peristomie There is some- 

 times a small median avicularium on the proximal lip of the peristome. 



/< 7*2=0.20 mm. . [Zs=0.80-0.90mm. 



^^^^ Zooecia {fe=0.30mm. 

 55899 20 Bull. 106 30 



