230 
BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 
tinctly marked (figs. 24, 25) or invisible (fig. 23). There are two pairs of lateral 
septules. The cryptocyst is a compact olocyst with the elements scattered. 
Affinities . — This form should not be confounded with species of the genus 
AmpMblestrum because it is without avicularia and its ovicell is endozooecial. 
The ovicell unfortunately is very rare. On 100 specimens collected only 
two had ovicells. The great abundance of specimens in the Vicksburgian, to 
which it seems restricted, has given rise to the specific name. 
Occurrence . — Vicksburgian (Marianna limestone) : One mile north of Monroe- 
ville, Alabama (abundant) ; West bank of Conecuh River, Escambia County, 
Alabama (abundant) ; Murder Creek, east of Castlebury, Alabama (abundant) ; 
near Claiborne. Monroe County, Alabama (abundant) ; 24 miles north of Millry, 
Washington County, Alabama (abundant). 
Cotypes. — Cat. No. 64254, U.S.N.M. 
Fig. 62. Genus Gargantua Jullien, 1888. 
A-C. Gargantua Helens Busk, 1859. Three views showing zooecial structure. (After Busk, 
1859. ) cp, polypidian convexity ; ople, opesiular indentations ; zc, calcified zooecium. 
Genus GARGANTUA Jullien, 1888. 
1888. Gargantua Jullien, Mission Scientifique du Cap Horn, Bryozoaires, vol. 6, p. 78. 
The polypidian convexity projects but little. The opesiules are incomplete 
and consist of two small symmetrical indentations. No avicularia. 
Genotype. — Gargantua ( M embranip ora ) bidens Busk, 1859. 
Range. — Miocene, Recent. 
Jullien took for the type of this genus, Cellopora ( Marginaria ) bidens Hage- 
now, 1851, which was figured very imperfectly, but he certainly had before him 
the beautiful figure given by Busk in 1859. We are not certain of the identity 
of the Cretaceous form with the Pliocene species. 
Furthermore, Waters in his work on Membraniporidae in 1898 1 described and 
figured a M embranipora bidens living off Capri at a depth of 220 meters. This 
species certainly belongs to the same genus as that of Busk; but it differs in its 
perforated ovicell, a character which we have never observed on the numerous 
specimens in our possession of typical Gargantua bidens from the Crag. 
The recent species ought to be taken as typical of the genus, and it is evident 
that a more complete study of the whole subject ought to be made. Gargantua is 
1 Journal Linnean Society London, Zoology, vol. 26, p. 681, pi. 49, fig. 1. 
