464 BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 



under great magnification. The peristome is very little salient; the peristomice is 

 semilunar and deformed inferiorly by the avicularium; the apertura is semilunar, 

 with a proximal border slightly convex. The ovicell is hyperstomial placed on the 

 distal zooecia; it opens above the apertura in the peristomie. The median avicu- 

 larium is small, a little salient, oblique, nearly round. 



I kpe=O.OQ-0.08 mm. - (3=0.40-0.50 mm. 



Measurements.-Penstomice \/* = 0.20-0.30 mm. 



Affinities. This small species is remarkable on account of the great facility 

 with which the zooecia are more or less bordered on the same zoarium. We have 

 not seen an appreciable difference from Reuss' species, and we believe our identi- 

 fication is good. 



It differs from Smittina exigua in its much smaller micrometric dimensions 

 (Zs=0.50 mm. and not 0.60 mm.), in its costular pleurocyst not porous in appear- 

 ance, and in its incrusting zoarium. 



It differs from Rmittina, sordida in the absence of lyrula, and of frontal avicu- 

 larium and in the presence of interareolar costules. 



Occurrence. Middle Jacksonian : Eighteen miles west of Wrightsville, John- 

 son County, Georgia (rare) ; 3^ miles north of Grovania, Georgia (rare) ; one-half 

 mile southeast of Georgia Kaolin Company Mine, Twiggs County, Georgia (rare) ; 

 17 miles northeast of Hawkinsville, Georgia (rare). 



Upper Jacksonian (Ocala limestone) : Old Factory, 1^ miles above Bainbridge, 

 Georgia (rare) ; Chipola River, east of Marianna, Jackson County, Florida (rare). 



Geological distribution. Rupelian (Stampian) of Germany (Reuss). 



Piesiotypes.Cnt. Nos. 64127-64129, U.S.N.M. 



SMITTINA PUNCTURATA, new species. 



Plate 61, figs. 5-8. 



Description. The zoarium incrusts bryozoa or shells. The zooecia are large, 

 swollen, utricular, distinct, elongated; the frontal is very convex, bordered by a 

 line of small scattered areolae; it is formed of a pleurocyst very finely porous; 

 the much developed peristomie bears an avicularium. The peristomice bears in 

 front a short, false rimule ; the peristome is thick and sharp ; the lyrule is wide and 

 bifurcated. The ovicell is small, globular, hyperstomial, of the same nature as the 

 frontal. The avicularium is median, elongated, with pivot, its beak directed toward 

 the top. The ancestrula is small, bordered by a mural rim and provided with a 

 semilunar apertura. 



,, -D , \hpe=0.16 mm. . (7,30.75-0.80 mm. 



Measurements. -renstomices' Zooecia{, . ,. .,. 



[Z;>6=0.15mm. \lz= 0.60-0.70 mm. 



Affinities. In the external aspect and its large dimensions this species is close 

 to Smittina, collum. It differs from it in the median position (and not lateral) 

 of its avicularium and in its porous and never costular pleurocyst. 



Occurrence. Middle Jacksonian ( Castle Hayne limestone) : Wilmington, North 

 Carolina (common). 



Cotypes.Csat. No. 64135, U.S.N.M. 



