74 MR. E. A. WALF0ED ON BEYOZOA EEOM [Feb. 1 894, 



zooecial length 0*5 mm., zooecial width 0-17 mm. ; mouth 0-1 to 

 0-07 mm. 



Zoarium simple, erect, claviform, base narrow (PL II. figs. 1, 2). 



Zooecia tubular, often compressed, springing up closely from the 

 central shaft, frequently with very long exsert ends, of varying 

 form. (1) PL III. fig. 1, mouth ovoid, pore on the lower lip, front 

 mural pore ; the ovicell is a dome-shaped mass of tubules, with 

 a larger central tubule projecting from the back of the zocecium : 

 (2) PL III.* fig. 2, mouth ovoid, quadrate mural pore at the back, 

 apertural plate with a large, transverse, ovoid opeuing above, tubules 

 and a narrow, transverse opening below : (3) PL III. fig. 4, com- 

 pressed, ending in two compressed tubular shafts or rostra with a 

 narrow opening below : (4) PL III. fig. 3, young, two terminal 

 processes, a median ovoid opening, lower labial pore. 



Ovicell-sacs globose, nest-like in the free ends of the zooecia, enve- 

 loping two or three ; punctulate, like the zoarial surface, with finer 

 pores between them (PL II. fig. 1). 



The zooecia tend to a linear arrangement, as in d'Orbigny's genus 

 Radiotubigera. 



The longitudinal section (PL II. fig. 2) shows an axial tube of 

 uniform diameter with thick walls, the primary zooecia lying close 

 to the tube before trending outward. Stem sinuous. 



The shafts or rostra of No. 3 resemble the rostra of the Celleporidse. 

 In other species of Pergensia the rostrum on one side bears an 

 avicularium, while on the other side it bears tubules. 



Pergensia major, sp. nov. (PL II. figs. 3, 4 ; PL III. figs. 11-18.) 



Zoarial length 3 to 4 mm., zoarial width 1 to 3 mm. ; zooecial 

 width 0-3 mm. ; mouth Ol to 013 mm. 



Zoarium erect, piriform, base narrow. Zooecia tubular, springing 

 at regular intervals from the stem outwards ; exsert parts of excep- 

 tional length (1 mm.). See PL II. fig. 4. 



Zooecia: (1) PL III. figs. 17, 18, terminal, with a recessed tri- 

 foliate or sub-crescentic aperture, supra-oral pore and ovieell- 

 tubules ; peristomial aperture hexagonal, with thick raised border : 

 (2) PL III. figs. 14-16, zooecia lengthened, front wall notched or 

 areolated, supra-oral ovicell-tubules, mouth-plate with several open- 

 ings : (3) PL III. figs. 11-13, mouth with terminal tubules and 

 transverse labial opening. 



Ovicell-sacs : ovoid, urn-shaped, or irregular. The common form 

 is ovoid, with tubular termination as in Crista. Zoarial surface 

 covered with the protruding ends of pore-tubes, between which are 

 finer pores. 



The apertural plate is often pierced with pores, as in Busk's genus 

 Calymnophora. Zooecial covers are scattered sparsely about the 

 zoarial surface. 



Pergensia minima, sp. nov. (PL II. fig. 12 ; PL III. figs. 5-10.) 

 Zoarial length 2*0 mm., zoarial width 1-0 mm. ; zooecial length 



0-33 mm., zooecial width 0-13 mm. ; mouth 0-07 mm. 



Zoarium erect, piriform, beginning with a thin cylindrical stem 



