70 BULLETIN 96, UNITED STATES NATIONAL MUSEUM. 



The apertiira presents on its straight proximal border a small 

 linear rimiile. The ovicell is recumbent and opens widely above the 

 apertiira. The frontal is a tremocyst. The peristomie is greatly 

 expanded and is interrupted in front by an immense incomplete 

 spiramen. The avicularium is vibraculoid. 



Genotype. — Schizohathy sella saccifera^ new species. Jacksonian. 



This genus differs from MastlgoyKora only in the nature of the 

 peristome, which is much more salient and interrupted in front by 

 a pseudospiramen. 



It differs from Gigantopora Ridley, provided also Avith a spiramen, 

 in the different form of the operculum and in its smooth frontal. 



SCHIZOBATHYSELLA SACCIFERA, new species. 



Plate 6, fig. 7. 



Description. — The zoarium incrusts shells. The zocecia are dis- 

 tinct, elongated, irregularly elliptical; the frontal is convex and 

 formed of a tremocyst with small pores. The apertura is semilunar ; 

 it bears on its straight proximal border a small linear rimule; the 

 peristome is much developed into two large lateral lips circimiscrib- 

 ing a sort of incomplete and very large spiramen. The ovicell is 

 hyperstomial and recumbent: it forms a sort of small, punctured 

 sack placed on the bottom of the zooecium. A small vibraculoid 

 avicularium is developed laterally near the apertura. 



^^ . ,7i(7=0.08 mm. 



Measurements. — Apertura /' ,-, ^ ^ 



^ /a=0.10 mm. 



. Zs=0.60-0.70 mm. 

 Zocecia ^^^o.30-0.40 mm. 



Variations. — The peristome is quite variable. The tremopores are 

 often obliterated by fossilization. The ovicell is truly recumbent or 

 partially supported on the distal zooecium. To accommodate so great 

 a peristomial complexity it is probable that the tentacles were very 

 long and fine. 



Occurrence. — Middle Jacksonian (Castle Hayne limestone) : Wil- 

 mington, North Carolina (rare). 



Type.— Cat. No. 62611, U-S.N.M. 



Genus LAGENIPORA Hincks, 1877. 



1877. Lagenipora Hincks. British Polyzoa, Annals Magazine Natural His- 

 tory (4), vol. 20, p. 215. 



Colonies consisting of a number of cells immersed in a common cal- 

 careous crust. Zocecia recumbent, contiguous, lageniform; oral ex- 

 tremity free, tubular, with a terminal orbicular orifice. (Hincks.) 



Genotype. — Lagenipora socialis Hincks, 1880. 



Range. — Jacksonian-Recent. 



