136 A MONOGRAPH OP THE TERTIARY POLYZOA OP VICTORIA. 



APPENDIX. 



By T. S. HALL, M.A., Demonstrator and Assistant Lecturer in Biology in the 



University of Melbourne. 



The following pages deal with the species which were either left undescribed 

 by Dr. McGrillivray, or were only in rough manuscript, and the plates for which 

 were already in the lithographer's hands. His names have in every instance been 

 followed. In the cases where a suitable description by another author was available, 

 I have extracted it, and have acknowledged the quotation. In other instances I 

 have drawn up diagnoses based upon an examination of the figured specimens and 

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

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

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

 the family or even generic characters on whieh its separation was based. Had the 

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

 I should have placed it under one of the other genera to which, as the slide shows, 

 Dr. McGillivray had at some time provisionally referred it. 



Bitectipora lineata, McGr. PL XIIL, fig. 20. 



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

 characters. The zoarium is unilateral and apparently encrusting, the figured 

 specimen having the form of a hollow cylinder, while 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-like 

 ridges. The thyrostome is at the anterior end at the base of a funnel-shaped 

 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 lower edge. 



The younger zocecia, which are perhaps really ocecia, overlie the older, and 

 although each appears to overlie a single one of the older series, yet as the apertures 

 look in all directions the colony assumes an irregular appearance. The aperture is 

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

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

 Below the mouth is a large crescentic area, flat, smooth and depressed, with a thin 

 but imperforate wall, apparently avicularian. The surface of the younger zocecia is 

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



