Bulletin - United States National Museum - Smithsonian Institution

44 BULLETIN 9(3, UNITED STATES NATIONAL MUSEUM.
versely. The lower face is smooth and presents some Uirge, scat-
tered concavities.
f^«=0.10 mm.
Measurements.—Aperture w^_q xi_o.12 mm.
r/,.2= 0.60-0.70 mm.
2of^"«|7,"=0.40mm.
Variatiwis.—In longitudinal section we are better able to com-
prehend the organization of this species. In particular the dorsal
Avail is a very thick olocyst, the cavities observed on the exterior do
not perforate it; they limit the zotecia between which they are
hollowed out. The large frontal pores open into the same zooecia
the tremopores are tubules; finally, the avicularium is a very large
chamber hoUoAved in the thickness of the frontal wall.
Occurrence.—Yicksburgian : West bank of Conecuh Eiver, Escambia
Countv. Alabama (common).
Type.—C^ii. No. 62592, U.S.N.M.
Fourth Group. MICROPORELLAE.
Genera of this group are not represented in the Early Tertiary.
DIVERS GENERA.
The genera listed under this heading have some peculiar characters
which do not permit of their classification in any of the large groups
cited ; but they appear really to belong to the same general family.
The principal genera, Avith their ranges and American occurrence
(marked *) are:
* Hou2eauina Pergens, 1889. Jacksonian, Priabonian.
*CycUc'opora, Hincks, 1884. Jacksonian-Eecent.
Kymella, ncAv genus. Recent.
Anarthropora Smitt, 1867. Latdorfian-Recent.
*Alimdosia Jullien, 1888. Wilcoxian-Recent.
KYMELLA, new genus.
{Kyma^ undulation, in allusion to the undulated form of the proximal
border of the operculum.)
The hyperstomial ovicell is always closed by the operculum. The
frontal is bordered laterally by areolae. The aperturu bears a very
wide rimule.
Genotype.—Kymella {CycUcopora) polaris Waters, 1904. Recent.
STOMACHETOSELLIDAE, new family.
The frontal is thick and occasions the formation of a peristomie.
The apertura is generally orbicular or semilunar with a very concave
proximal border. The peristomice is ahvays different in form
; ;