i:?() A MONOGRATir OF THE TERTIARY POLYZOA OF VICTORIA. 



APPENDIX. 



By T. S. HALL, A/. A., Dcinonstrator and Assistant Lecturer in Biology in tJie 



University of Melbourne. 



The follo\vin2f pai^'os dcril witli tho sjiccics wliicli Avcro oit.lior loft iindoscribod 

 1)V l)i". McGillivray, or were only in roni^'li in;innscri|)t, niid jlic ])l;it('s for wliicli 

 wi'ic ali'c.idv ill til*' litli()i;i"i|)li('r's Imnds. His names Iiavc in every instance 1)een 

 rollowed. In the cases wliere a snitahlo dcsscription by another autlior ^vas available, 

 T have extracted it, and have acknowledged the quotation. In otlier instances T 

 have drawn nji diagnoses l)as(>d upon an examination of the llgurod specimens and 

 such other examples as the collection contained. In the case of the family 

 BitcdiporidcB, of which only two examples occur in the collection, I have merely 

 descrilied the specimens carefully, and have refrained from an attempt at indicating 

 th(^ familv oi- even generic characters on which its separation was based. Had the 

 name not occurred in the Table of Classification, which had already been struck off, 

 T should liav(! placed it under one of the other genei-a to which, as the slide shoAvs, 

 Dr. jMcGillivray had at some time provisionally referred it. 



BitecHpora lineata, McG. PI. XIII., fig. 20. 



There arc two specimens of this puzzling form, but both show the same 

 characters. The zoarium is unilateral and a})parently encrusting, the figured 

 specimen having the form of a hollow cylinder, A\hil(^ the other, a mere fragment, is 

 a flat expansion. The zocecia occur under two very distinct forms between which 

 the specimens do not show any gradations. The older series is arranged in longi- 

 tudinal rows, and the boundaries are distinctly marked by projecting, plate-lik(^ 

 ridges. The thyrostome is at the anterior end at the base of a fimnel-sha])ed 

 depression, the axis of which is almost parallel to that of the zoarium, so that this 

 fact together with the occurrence of matrix quite prevents its true shape being 

 seen. A tubular prominent papilla, probably avicularian, occurs on its loAver edge. 



The younger zociria, wliich are perha])s i-eally oo'cia, overlie the older, and 

 although each appears to overlie a single one of the older series, yet as the aperlui-cs 

 look in nil directions the colony assumes an irregular apjicarance. The aperture is 

 subcircular with a sliglit sinus on the lower lip, and with two lateral denticles 

 within ; these, though not shown in the figure, are very evident in the specimens. 

 Pelow the mouth is a large crescentic area, flat, smooth and de])ressed, Avitli a thin 

 but imperforate wall, a])parently avicularian. The sui-face of the younger zorecia is 

 inflated, while that of the older forms is not so. The surface of the whole colony 



