A MONOGRAPH OP THE TERTIARY POLYZOA OP VICTORIA. 7 



Of this exceedingly interesting form I have only seen two specimens. It was 

 described by Waters from Bird Rock, but the central zocecium was not distinguished, 

 and it was referred to Catenicella, a genus with which it obviously has no connection. 

 It is very closely allied to the living West Indian L. tulipifera, from which it differs 

 only in the absence of the small spine or process from the upper part of the peristome 

 and in the much greater prolongation downwards of the primary or central zocecium- 

 The size of the zocecia is the same. There is an obscure mark on the central stem 

 opposite the base of the lateral zocecia which may indicate the termination of the 

 cell, but there is no articulation. 



The recent species was first described as a Sertularian by Linnseus, then as a 

 Cellaria by Ellis and Solander, who gave a good description and figure. Subse- 

 quently Lamouroux referred it, with a true Sertularian, to his genus Pasythea. 

 Lamarck, about the same time, constituted a new genus, Liriozoa, for its reception. 

 De Blainville gave it still another generic name, calling it Tuliparia. Hincks 

 (A.M.N.H., 1881), gave an excellent description and figure under the name of 

 Epicaulidium pulchrum, having overlooked the notices of the previous naturalists — 

 an oversight which he shortly afterwards rectified. Lamarck's generic name seems 

 to be that which should be retained. 



Family Bigemellariid^e. 



Zocecia arranged in closely united pairs in continuous series on the upper part 

 of a calcareous stem, the zocecia of each pair facing in opposite directions and each 

 pair placed at right angles to the succeeding and preceding pairs ; thyrostome 

 oblique, subterminal. Stems probably originating from a creeping stolon. 



Bigemellaria, n.g. 



Characters the same as for the family. Peristome raised, lower edge with a 

 spout-like sinus. 



1. B. pedunculata, n.sp. PI. III., figs. 2, 3. 



Lower half of each zocecium closely united to the opposite zocecium of the pair, 

 upper part projecting forwards ; anterior surface convex, punctate or perforated, 

 bounded by a narrow raised line ; thyrostome nearly terminal, rounded above and 

 with a sinus in the lower lip ; peristome slightly raised. The stem is formed by the 

 prolongation downwards of the lower pair of zocecia, the succeeding pairs of zocecia 

 being imbedded in the cavity formed by the divergence of the pair below. It is 

 impossible to say whether the clusters are terminal or of how many pairs they may 

 consist (one specimen has seven), as my specimens only show the prolongation 

 downwards and not the superior termination. 



M.C.; M. 



