EARLY TERTIABY CHEILOSTOME BEYOZOA. 69 



Genus HEMICYCLOPORA Norman, 1909. 



1909. Hemicyclopora Norm an, Polyzoa of Madeira and neighboring islands. 

 Journal Linnean .Society, London, Zoology, vol. 30, p. 308. 



The ovicell is recumbent. The apertiira is provided with very low 

 cardelles and formed of a large anter and of a small concave poster. 

 The frontal is smooth and formed of an olocyst. Spines. 



Genotype. — Hemicyclopora (Lepralia) polita Hincks, 1880. 



Range. — Helvetian-Recent. 



HEMICYCLOPORA PARAJUNCTA, new species. 

 Plate 6, fig. 6. 



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

 tinct, somewhat elongated, ogival; the frontal is somewhat convex 

 and absolutely smooth. The apertura is oblique, suborbicular ; the 

 peristome bears 8 distal spines and a proximal small mucronoid lip. 

 The ovicell is globular, very salient, smooth, very little joined to 

 the distal zocecium ; it is recumbent, hyperstomial. 



f7i«:z=0.10mm. 



MeasureTnents. — Apertura 1 7^—0 99 mm 



f 7.2=0.50-0.55 mm. 

 Zooecia |/5= 0.40-0.55 mm. 

 Affinities. — This species offers the exterior aspect of a Perigas- 

 trella with very small areolae, which generally appear smooth. 



Occurrence. — Middle Jacksonian : Near Lenuds Ferry, South Caro- 

 lina (common). 



Type.— C^t. No. B2610, U.S.N.M. 



Genus MASTIGOPHORA Hincks, 1880. 



1880. Mastigophora Hincks, British Marine Polyzoa, p. 278. 



The ovicell is small and recumbent. The apertura is semilunar; 

 its proximal border is straight and bears a rimule elongated and 

 rounded. The frontal is a tremocyst with small pores placed on an 

 olocyst. Vibracula. 



Genotypes. — Mastigophora hyndmanni Johnson, 1847, and Masti- 

 gophora {Flustra) dutertrei Savigny-Audouin, 1826. 



Range. — Lutecian-Recent. 



Both of the genotypes of this well-marked genus occur in the 

 Jacksonian and Vicksburgian strata of the Southern States. 



SCHIZOBATHYSELLA, new genus. 



{jSchizos, slit, and bathys, deep, referring to the position of the 

 apertura.) 



