290 Rev. T. Hincks's Contributions towards a 



Loc. Port Denison, Queensland (Miss Jelly). 



I have only had the opportunity of examining a single 

 specimen of this fine species, and am therefore unable to give 

 a complete account of the habit of growth, which may probably 

 vary considerably. 



The oral sinus is somewhat variable in shape and is often 

 widely open above ; but in what seems to be the perfect state 

 it is as described. There is also some diversity in the form 

 of the zocecia, those on the growing margin being often 

 obovate or ovate, while those in the interior of the colony are 

 more accurately characterized as quadrangular or subquad- 

 rangular. 



Many of the cells also are narrow and greatly elongated. 



Schizoporella bimunita, sp. n. (PI. VI. figs. 3.) 



Zoarium erect, bilaminate. Zocecia on both sides, lozenge- 

 shaped, surrounded by raised lines, perforated round the 

 margin *, the surface, when slightly calcified, rather depressed, 

 covered with minute perforations, often nodulated ; as calcifica- 

 tion proceeds, irregular, raised, sometimes covered with low 

 papilla^ sometimes smooth and dense, with scattered punc- 

 tures ; orifice elongate-oval, the sides curving outward very 

 slightly, lower margin in great part occupied by a deept sinus, 

 widest above and narrowing gradually and slightly down- 

 wards, peristome not elevated ; on each side of the cell (or 

 sometimes on one side only) an elongate pointed avicularium, 

 originating about the middle and stretching upwards alongside 

 the orifice ; scattered amongst the ordinary zooecia, and often 

 forming small groups, cells (? ooecial) having the orifice sub- 

 orbicular, with a shallow sinus, wide above, narrowing slightly 

 and rounded below (PI. VII. fig. 3 a) ; in other respects re- 

 sembling the zooecia. 



Hab. Stems of Hydroida. 



Loc. Port Elizabeth, South Africa (Miss Jelly). 



I am unable to give much account of the form of the 

 zoarium and the mode of growth. The largest specimen 

 which I have examined measures rather more than a quarter 

 of an inch across and forms a compressed bilaminate expan- 

 sion, which is attached to the stem of a Sertularian. The 

 very regular shape of the zooecia, their division into two 

 classes, each with its characteristic orifice, and the definite 

 arrangement of the two large avicularia which, as it were, 



* The marginal perforations are frequently obliterated by the calcifica- 

 tion. 



t Often more than half as long as the upper part of the orifice. 



