134 THE PEOCEEDINGS OF THE LINNEAN SOCIETY 



Cylicia vacda, k. s. Plate 12, figs. 4, 4a, 4b. 



Corallum very small, circular, much inclined, with a broad base 

 which sends out thick rounded buttress-like expansions ; costa 

 broad, obtusely angular, corresponding with the septa ; epitheca 

 shining, covering the corallum with numerous small chevron-like 

 close rounded folds, giving rise to a " herring-bone" pattern ; 

 calice circular ; wall thin, somewhat higher than the septa which 

 are six in number, not exsert, projecting very little into the 

 calice, only slightly more advanced at the base than at the 

 calicular edge, and all studded at the base with long processes 

 projecting at right angles from the face ; no columella. Dimen- 

 sions, alt. 1|, lat. 2 mil. 



On Flahellum ruhrum, Wellington, New Zealand. Plate 12, 

 fig. 4, coral on Flahellum., nat. size, 4a, side view, much enlarged, 

 4b, coral seen from above. 



The following coral is remarkable as being a third species of 

 Flacotrochus differing considerably from the two previously 

 known. It is smaller, more solid, and with a distinct pedicel. 

 There are three known Australian Miocene species, namely, 

 P. deltoideus, P. elo7igatus, and P. elegans. From all of these 

 also it differs in its pedicellate form. It is not so small as P. 

 elegans, but is more solid. 



A synopsis of the fossil species would stand thus : — 1 . Broad 

 and pointed, P. deltoideus ; 2. Narrow and pointed, P. elongaius ; 

 3. Base nearly as long and broad as calice, P. elegans. The 

 synopsis of the living species is as follows : — 1. Short with a 

 basilar scar, P. Icevis ; 2. Long with a compressed spine at the 

 base, P. candeanus ; 3. Flabellate and pedicellate, the present 

 species. 



Placotrochus pedicellatus, n. s. Plate 13, figs. 7, 7a. 



Corallum small, flabellate, rather solid, rising from a thick 

 wide pedicel, from which it spreads abruptly (instead of sloping 

 gradually) at rather more than a right angle ; costa little raised, 

 obtusely angular, covered with very distinct close herring-bone 

 markings ; calice narrowly elliptical, the two ends of the major 

 axis sharply angular, and about half the whole height below the 



