28 BULLETIN 90, UNITED STATES NATIONAL MUSEUM. 



FLORIDINELLA, new genus. 



The ovicell is endozooecial and separated from the zooccia by a 

 fold. The polypidian convexity is not prominent. The opesiular 

 indentations are large and rounded. The opesium is constricted by 

 two symmetrical lateral teeth at the level of the opercular articulation. 



Genotype. — Floridinella vickshurgica, new species. Vicksburgian. 



FLORIDINELLA VICKSBURGICA, new species. 



Plate 3, fig. 3. 



Descnption. — The zoarium is unilamellar, hollow, cylindrical, and 

 incrusts the stems or small roots of alg?e. The zooecia are elongated, 

 distinct, separated by a deep furrow; the mural rim is incomplete, 

 rather broad, distinct from the cryptocyst. The cryptocyst is shal- 

 low, smooth or finely granular, longer than the opesium. The polyp- 

 idian convexity is but slightly projecting; the opesiular indenta- 

 tations are large, symmetrically rounded; the opesium is elongated, 

 constricted superiorly by two lateral teeth placed at the level of the 

 operculum. 



, „ . fAo=0.20 mm. 

 Measurements. — Opesium {^ „ . „ 



^ |fo =0.16 mm. 



fZs^O.SO mm. 



Zooecmm {-, non n m 



[fe =0.30-0.40 mm. 

 Occurrence. — Vicksburgian : One mile north of Monroeville, Ala- 

 bama and numerous localities in the State (very abundant). 

 Type.— Cut. No. 62583, U.S.N.M. 



DACRYONELLA, new genus. 



(D aery on, tear, referring to the form of the avicularia.) 



The polypidian convexity protrudes very little and is inconstant. 

 The opesiules are large, round, lateral indentations. The ovicell is 

 endozooecial. There are no opesial processes (therefore an opercular 

 A'alve). The opesium is elongated (therefore the parietal muscles 

 are much developed). The avicularia are very small, constant, 

 placed in all the interzocecial angles, and have the form of small 

 tear drops. 



Genotype. — Dacryonella octonaria^ new species. Jacksonian. 



This is a Rosseliana ornamented with avicularia. As in this 

 genus also, the opesiules are inconstant and placed very far from 

 the aperture in consequence of the great development of the parietal 

 muscles. 



DACRYONELLA OCTONARIA, new species. 



Plate 3, fig. 4. 



Description. — The zoarium incrusts small shells or more often 

 creeps over algae; very frequently it consists of m.any superposed 



