EARLY TEKTIARY CHEILOSTOME BRYOZOA. 47 



Occurrence. — Vicksburgian ; 1 mile north of Monroeville, Alabama 

 (very common). 

 Type.— Cat. No. 62594, U.S.N.M. 



SCHIZEMIELLA, new genus. 



(Schizos, slit; emi, abbreviation of peristomie.) 



The frontal of the ovicell is very fragile. The apertura is schizo- 

 porelliclan with wide rimiile. The rimiile-spiramen is inconstant. 

 The tubules are reimited on their commonage. 



Genotype. — Schizemiella claibornica, new species. Claibornian, 



SCHIZEMIELLA CLAIBORNICA, new species. 



Plate 4, fig. 9. 



Description. — The zoariiim is free, bilamellar with inseparable 

 lamellae. The zocecia are indistinct; the frontal is thickened, little 

 convex, formed of a tremocyst with large irregular tubules placed on 

 a thin olocyst with very small pores in quincunx. The apertura is 

 formed of an ogival anter and a concave poster with a very wide 

 rimule ; the peristomice is elongated, embedded, with a very wide, ir- 

 regular rimule-spiramen. The ovicell is hyperstomial and opens 

 largely into the peristomie; it is little globular, hardly salient; cov- 

 ered by a smooth or perforated, very fragile wall ; the peristomice is 

 elliptical and transverse. The avicularium is triangular, the beak 

 directed above, adjacent to the peristomice which it deforms, pro- 

 vided with a pivot. 



T. •.•/.• X \hpe^0.20 mm. 

 Measurements. — Peristomice (exterior) | , —014—0 16 mm 



,. ^ . , [^.=0.12 mm. 

 Apertura (interior) 1^^^^^^^^^ 



„ .,.,.. [Ls=0.54: mm. 

 Zocecia (interior) , „ „„ 



^ ^ [?2=0.30 mm. 



Variations. — In the interior the tremopores are regularly placed in 

 quincunx ; on the exterior they are very irregularly disposed, larger 

 and less numerous. 



The rimule of the peristomice is very irregular. In reality the 

 form of the apertura belongs to the group of very typical Schizo- 

 porella and the operculum ought to be chitinized enough to insure 

 sufficiently the opening of the compensatrix by itself. 



Occurrence. — Claibornian (Gosport) ; Claiborne, Alabama (rare). 

 One mile west of Rockville, Clarke County, Alabama (rare). 



Type.— C?it. No. 62595, U.S.N.M. 



METRADOLIUM, new genus. 



{Metra, womb ; dolios, deceptive, having reference to the deceptive 

 aspect of the ovicells.) 



