224 BULLETIN 106, UNITED STATES NATIONAL -MUSEUM. 



In its most usual aspect and when altered by fossilization, the opesium of 

 the onychocellarium resembles a small bottle, whence our specific name. 



Affinities. Floridina laguncula differs from F. antiqua Smitt, 1873, in its 

 smaller micrometric measurements (Lz 0.40 mm.), in its more apparent mural 

 rims, in its .smaller opesiules rarely visible exteriorly, and in its opesium which 

 is reduced to the opercular region. 



It differs from Floridina asymmetrica in the bottle shaped opesium of the 

 onychocellarium, in its more elongated, regular zooecia, and in the symmetry of its 

 opesium. 



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

 North Carolina (very common). 



Cotypes. Cat. No. 63985, U.S.N.M. 



FLORlfllNA ASYMMETRICA, new species. 



Plate 35, figs. 6-8. 



Description. The zoarium is unilamellar, tubular, growing over algae or 

 incrusting their radicles. The zooecia are broad, distinct, hexagonal, somewhat 

 ogival in shape; the cryptocyst is shallow, a little larger than the opesium, granu- 

 lar, without mural rim ; the opesium is trifoliate and divided by two salient proc- 

 esses serving as upper limits to two incomplete and unsymmetrical opesiules; the 

 polypidian convexity is deep, not prominent, and unsymmetrical. The onychocel- 

 larium is larger than the zooecium, pentagonal, very elongated; its opesium is 

 triangular, denticulated. 



Measurements. Opesium [7(0=0.20 mm. . fZs=0.36-0.40mm. 



(including opesiules) Uo=0.16-0.20 mm. m l fe=0.36-0.40 mm. 



(Lon=0.5Qmm. 

 Onj^chocellanumj , _no- 



Variations. We have stated that irregularity is the rule in this genus. The 

 symmetry of the zooecia is not absolute; on nearly all the zoaria there are asym- 

 metrical zooecia. In this species the phenomenon is more general and symmetrical 

 zooecia are rarer. The opesiular indentations and the polypidian convexity also 

 lack symmetry, following the obliquity of the polypide in its lodging place occa- 

 sioned by the eccentric attachment of the retractor muscles. 



Affinities. -This species differs from Floridina laguncula in the absence of 

 mural rim and in its irregular, although more visible, opesiules. 



It differs from Floridina antiqua Smitt in its smaller micrometric measure- 

 ments (Ls=OAO mm), its less developed opesiules, and in its irregular and less 

 visible polypidian convexity. 



Occurrence. Upper Jacksonian (Ocala limestone) : Bainbridge, Georgia 

 (rare) ; Old Factory. H miles above Bainbridge, Georgia (rare). 



Cotypes. Cat.*No. 63982, U.S.N.M. 



