4G0 
BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 
The line of areolae is often double or triple (fig. 11) ; they are generally 
small but they may become larger (fig. 12) when there is a formation of inter- 
areolar costules. In the interior the olocyst is smooth (fig. 15) ; the wide lyrula 
is quite visible. 
Affinities . — This species is quite well characterized by its avicularium placed 
on the peristome which forms a sort of collar about the zooecium. In this char- 
acter it differs clearly from Smittina grandifossa and from Smittina coronata. 
Occurrence . — Middle Jacksonian: Wilmington, North Carolina (common); 
near Lenuds Ferry, South Carolina (rare). 
Cotypes.— Cat. No. 64123, U.S.N.M. 
SMITTINA LABIATULA, new species. 
Plate 59, ligs. 7-10. 
Description . — The zoarium is free, cylindrical, formed of from 4 to 6 longi- 
tudinal rows of zooecia. The zooecia are distinct, a little elongated, elliptical; the 
frontal is somewhat convex and surrounded by a rovr of irregular areolae. The 
apertura is much imbedded; it is hardly visible. The peristomice is limited later- 
ally by two salient Ups, between which is a large sinus terminated by a median 
avicularium. The ovicell is hyperstomial and is imbedded in the distal zooecia; 
it opens into the peristomie a hove the apertura. 
Variations . — This species is remarkable in its pleurocystal variations, according 
to which the areolae are large (fig. 9) or small (fig. 7). The coalescence of the 
peristomie and the avicularium occasions in the vertical sections (fig. 10) an arma- 
ture quite variable and difficult to comprehend. The oral, median avicularium 
sometimes becomes frontal ; it is distant from the peristomice and triangular. 
Occurrence . — Middle Jacksonian (Castle Hayne limestone) : Wilmington. North 
Carolina (rare). 
Cotypes. — Cat. No. 64125, U.S.N.M. 
SMITTINA GRANDIFOSSA, new species. 
Plate 59, figs. 1-6. 
Description . — The zoarium is plurilamellar, and incrusts shells or algae over 
large surfaces. The zooecia are large, somewhat elongated, distinct, hexagonal, 
separated by a thread more or less prominent; the frontal is smooth, little convex, 
bordered by a row of large , triangular areolae ; it is formed of an olocyst per- 
forated laterally, in which the elements are oriented toward the lyrula and which 
supports a smooth or costulate pleurocvst. The peristome is little salient, some- 
what thick; it bears interiorly a pseudo-rimule ; the lyrula is salient and triangular; 
often there are two wide rimules. The ovicell is hyperstomial, globular, little 
salient, imbedded in the distal zooecia ; it bears a porous area surrounded by a 
prominent collar; it opens largely into the peristomie. 
Measurements. 
,, . , . \hpe— 0.20 mm. 
-l eristom ice 7 „ „ „ 
!^?e=0.20mm. 
Zooecia 
\L 
1 Is 
2 = 1 . 00 - 1.20 mm. 
= 0.70 mm. 
