Tol. 50.] BEYOZOA FKOM THE MIDDLE LIAS. 81 



unequal parts, the upper section fronted with tuhuli, the lower and 

 larger section closed by a flat plate pierced with few pores, small 

 opening at the base. (PI. V. fig. 17.) 



Central and other tubuli are shown in worn cells (PI. V. fig. 12). 



Small avicularium upon the front wall. 



Cistern-cell (PL V. figs. 10, 11) about three times as long and broad 

 as the ordinary zooecia, with a broad spout-like process opening into 

 a thick-lipped, transversely ovoid, basin-shaped recess. The whole 

 resembles a spouted upright cistern in the zoarium. The spout- 

 like process is sometimes above, but more generally below the border 

 of the basin into which it looks. Surface covered with pore-tubes 

 like the zooecia. 



Zooecial margin of a dark purple colour, sometimes raised. Zoarial 

 surface covered with fine pore-tubes and minute spines. 



In Leprcdia (?) syringopora, lleuss, Mr. Waters * describes some 

 ' closures ' over the aperture having a tubule in the centre similar 

 to those of many Diastoporcv. It appears to be related to the 

 infundibuliform opening in my Cisternifera. There are pores on 

 each side of the central opening in Cisternifera, and pores on each 

 side of the centre of the aperture in L. syringopora. A transverse 

 oral bar occurs in other forms. P>usk figures an infundibuliform 

 cup in his Chorizopora Jwnolulensis, 2, but gives the primary orifico 

 as its origin. 



ClSTERNIFERA INCONSTAXS, FOKHA SECTJNDA. (PI. VI. figs. 14—22.) 



Zoarium erect, foliaceous, bilaminate. Zooecia lengthened, tubular, 

 spreading fan-like from the base, proximal ends free for one-third 

 of the length. 



Secondary aperture orbicular, ovoid or shovel-shaped. In the 

 latter the upper lip is raised, thin, squared, and bears two pores 

 (PL VI. figs. 15,16,21). 



(1). Apertural plate with central opening and pores, and ovoid 

 opercular aperture at the lower lip (PL VI. fig. 14). Apertural 

 plate of shovel-shaped zooecia variously pierced (PL VI. figs. 15, 16). 



(2). Apertural plate with sub-central, oblong aperture and 

 ovicell-pores. (PL VI. fig. 22.) 



(3). Apertural plate with sub-central, oval aperture and ovicell- 

 tube opening. Ovicell proceeding from the back of the cell, and 

 traced on the zooecial wall at the rear. (PL VI. fig. 17.) 



The cistern-cell is thrice as long and broad as the zooecia, and 

 has at the top abroad, spout-like process, opening into a transversely 

 ovoid, basin-shaped recess. It is punctulate : the ordinary zoarial 

 surface is covered with larger pore-tubes. 



The zooecia appear to be multiform, apart from the accidents of 

 fossilization, which make even such good material hard to under- 

 stand. Some have both upper and lower lips produced. The upper 

 lip of the shovel-shaped zooecium extends until the apertural plate 



1 ' North Italian Bryozoa,' Quart. Journ. Geol. Soc. vol. xlvii. (1891) pp. 20, 21. 



2 Busk, Eeport on the Polyzoa, ' Challenger' Eeports, vol. x. (,18^4) p. 149. 



Q. J. G. S. No. 197, g 



