338 



A. W. WATERS ON FOSSIL CHILOSTOMATOUS 



seen to bear a very minute avicularium. Aperture 0*1 millim. wide, 

 0*14 millim. long. 



If I had been unable to see the interior of the zooecium, I should 

 have considered this to be SchizoporeUa sinuosa, B., with which it 

 corresponds in most particulars. I have examined the interior of 

 S. sinuosa from Shetland, in which there is no similar denticle or 

 avicularium. Some of the zooecial areas have no aperture ; and in 

 these there are few or no pores. 



52. Schtzoporella vigtlans, sp. nov. Plate XIV. fig. 13. 



Zoarium erect, quadrilateral, with zocecia on the four faces. Zooecia 

 irregularly oblong ; surface flat, with elongated pores (reminding us 

 of those of Hornera); upper part of the zooecium slightly raised. 

 Oral aperture rounded on the distal edge, nearly straight on the 

 proximal, with a well-marked sinus. Acute avicularia, placed hori- 

 zontally in the middle of the front wall of the zooecium. 



The proximal edge of the oral aperture is slightly straighter than 

 figured. Aperture 0*08 millim. wide, 0*07 millim. long. 



53. Schtzoporella phymatopora, Ess. Plate XV. figs. 31, 32. 



Eschara phymatopora, Eeuss. te Poss. Anth. u. Bry. von Crosaro," 

 Denschr. Ak. JNaturwissensch. Wien, vol. xxix. 1869, p. 272 (60), 

 pi. xxxiii. fig. 1. 



Zoarium cylindrical. Zooecia irregularly oval, not much raised ; 

 border distinct. Aperture circular, with sinus below. Avicularia 

 at about one third or the middle of the length of the zooecium, placed 

 on one side ; surface of zooecium covered with pores and fine gra- 

 nulations. 



When I drew fig. 32, I supposed that this was Bactridium, and 

 allied to Bactridium Hagenowi, Ess. ; and then I called it tri- 

 serrata, as in all the fragments I had there were three rows of 

 cells. Since then fragments in my own and in Miss Jelly's 

 collection have shown that it is cylindrical. The species splits 

 up with considerable regularity ; and then the other sides of the 

 zooecia are seen with their lateral rosette-plates appearing like a row 

 of pores. A central furrow is also seen with two rosette-plates for 

 the entrance of the endosarc. The avicularia are usually much 

 lower than figured by Eeuss in his specimen from the Val di Lonte, 

 but in some Australian specimens are higher than in my figure 31. 

 Aperture 0*07 millim. wide. 



Log. Val di Lonte (Ess.) ; Perrara di Monte Baldo (A. W. W.): 

 Bartonian. 



54. Schtzoporella ventricosa ?, Haswell (in Onchoporm forma). 

 Onchopora ventricosa, Haswell, " On some Polyzoa from the 



Queensland coast," Proc. Linn. Soc. IST. S. Wales, vol. v. pt. i. 1880, 

 p. 36, pi. i. fig. 3. . 



There is only a small fragment, which has the zoarium cylindrical, 



