Bulletin - United States National Museum - Smithsonian Institution

46 BULLETIN 96, UNITED STATES NATIONAL MUSEUM.
_ . . / ,
• X fAi»e= 0.10-0.15 mm.
Measurements.—Penstomice (exterior) 7„g_0 i5_o 20 mm
Ape =0.12-0. 15 mm.
,. , .
Apertura J (interior) / a io a i -
^ ^ '
\ Z/>e=0.12-0.1o mm.
mm.
. [Zs=0.90
Zooecia , a oa a m
7.e=: 0.30-0.40 mm.
[
This species with its enormous, solid walls, appears robust and
resistant. Nevertheless, this is not the case. It was rapidly exterminated
and never had a large geographic distribution. This is
frequent in the bryozoa, where pliancy is a better sign of longevity
and resistance.
Occurrence.—Vicksburgian : West bank Conecuh River, Escambia
County, Alabama (very common).
Tyfe.—Q^X. No. 62593, U.S.N.M.
ENOPLOSTOMELLA, new genus.
{Enoplis, armed; stoma, mouth.)
The apertura and peristomice of the ovicelled zooecia are identical
with the apertura and peristomice of the ordinary zooecia. The
frontal is a tremocyst with wide-mouthed tubules. The ovicell does
not entirely surround the peristomice. There is an avicularium in
the peristomie in the immediate vicinity of the peristomice.
Genotype.— EnoplostoTnella defixa, new species.
Range.—Jacksonian-Vicksburgian.
ENOPLOSTOMELLA DEFIXA, new species.
Plate 4. fig. 8.
Description.—The zoarium is free, cylindrical, vinculariform,
formed of from 6 to 7 longitudinal rows of zooecia. The zooecia are
indistinct ; the frontal is little thickened, convex, formed of a tremocyst
with large tubules placed above an olocyst with pores. The
apertura (interior) is formed of a semilunar anter and of a concave
poster; the peristomice (exterior) is elongated, embedded, provided
with a triangular rimule-spiramen. The ovicell is hyperstomial,
buried in the distal zooecia, globular, salient, decorated with large
tremopores; it opens largely into the peristome. The oral avicularium
is adjacent to the peristomice and placed somewhat ob-
liquely; it is triangular, rather long, and provided with a pivot; the
beak is turned outward.
. K J.
Measurements.—Apertura i
/• ^ • \ fA«=0.15 mm.
(interior) , „^„
"-
'
[ 7(2=0.15 mm.
^ . , . . , .
N [Awe=0.14-0.16 mm.
Penstomice (exterior)} ^^,^^0.18-0.20 mm.
mm.
[ ?s=0.40 mm.
. fZ2=0.90-1.00
Zooecia , „ .„