82 ME. E. A. WALEOED ON CHEILOSTOMATOTTS [Feb. 1 894, 



becomes deeply recessed, and the lip ultimately bears a large, quad- 

 rate recess (ovicellular). 



An infundibuliform opening occurs in the apertural plate of 

 certain zocecia (PL VI. fig. 14). The plate is pore-pierced, and its 

 lower part and the adjoining part of the lower lip often (where it is 

 very thin) are broken away, leaving an irregular triangular opening. 



Mouth often divided by a transverse bar. (PI. VI. fig. 22.) 



ClSTEENIFEEA INCONSTANS, EOEMA 1EEXIA. (PI. V. figs. 18-21; PI. VI. 

 figs. 1-4.) 



Zoarium foliaceous, bilaminate. Zocecia lengthened, tubular, 

 proximal ends free for nearly one-half of the length. 



Apertural plate with ovicell-tube opening and ovoid opercular 

 aperture near the lower lip, which is sometimes indented. (PI. V. 

 fig. 18.) 



Upper lip arched and lengthened, with ovicell-tube, or ending in 

 a thin, squared, vertical, plate-like process pierced with two pores 

 (PI. VI. fig. 1). Ovicell-tube passing through the back and com- 

 municating with part of an ovicell traced on the wall of the 

 zooecium above (PL VI. fig. 1). A mitre-shaped ovicell with a pore 

 at the summit is figured (PL VI. fig. 4). 



At the top of the zoarium one of the immature zocecia has the 

 upper part covered with a perforated curtain, analogous to the 

 perforated front of the form figured in PL VI. fig. 3. 



ClSTEENIEEEA INCONSTANS, EORMA QUAETA. (PL VI. figs. 5-13.) 



Zoarium encrusting. Zooecia spreading fan-like from the base, 

 and looking towards the upper zoarial surface : tubular, and with 

 proximal ends free for nearly one-half of the length, marginal 

 zocecia nearly immersed. 



Zocecia with lip arched above an ovicell-tube ; centrally a pore- 

 tube rounded or irregularly sub-quadrate, bearing a spherical 

 granular mass pierced with fine pores. Aperture ovoid, with a plain 

 ovoid operculum near the lower lip. (PL VI. figs. 5, 6, 7.) 



A ribbon-like septal loop occupies the central part of a zooecium 

 and makes an irregular cell or cup in the mouth (PL VI. figs. 9, 12). 

 It seems to be a further development of the central tube. 



Worn cells show a central tubule, the base of the central tube. 



ClSTEENIFEEA CLATJSA, Sp. nOV. (PL VII. figS. 1-11.) 



Zoarium erect, ramose, branches cylindrical or flattened. Zooecia 

 lengthened, tubular, with free proximal ends. 



Aperture orbicular or ovoid, peristome elevated. 



(1). Apertural plate with ovoid ovicell-opening and oblong oper- 

 cular aperture at the lower border, the intervening area with 

 tubuli. (PL VII. figs. 2, 3, 4, 9.) 



(2). Apertural plate pierced with tubuli in the upper part, with 

 an oblong ovoid opercular aperture at the lower border. Ovicell- 

 tube springing out of the' back of the zooecium, certain zocecia 

 ending in a triangular apex with a pore at the summit. (PL VII. 

 fig. 5.) 



