CORALS AND BRYOZOA. 11 



between the costa^ -n'hicli are broad^ rounded, bifurcating, with a 

 groove in the centre, near the summit, into which groove the 

 septa seem to be inserted. There are six systems, with four cycles 

 of very thin structure, and apparently not composed of two 

 laminae. Columella a thin septum. Some of the septa are 

 thickened towards the centre of the fossa. Calice perfectly 

 circular ; edge worn away. Alt. 7, lat. 10 millim. The general 

 appearance of this fossil recalls the genus Conosmilia of Duncan, 

 and it is more like one of the mesozoic Trochosmiliacece than a 

 Sphenotrochus ; but I found no endotheca in the only specimen 

 I examined. I should have liked other examples to render the 

 determination quite satisfactory. App. Off. Cat., Xo. 15, 

 p. 36 ; VI. ; Christie's, Inangahua River, Buller Valley. Fig. 9, 

 coral, twice natural size. 



Sphenotrochus coronatus, n. s. Corallum narrowly pedicel- 

 late ; cuneiform, spreading into a broad basket-like oval calice. 

 Costa distinct and projecting, not corresponding with the septa, 

 except in the case of the fourth and fifth orders, where they pro- 

 ject as tall spines or laminae. Calice broad and shallow, the 

 septa projecting very little into the fossa. Columella consisting 

 of one long, undulating septum at the bottom of the calice. Six 

 systems and four cycles. First to third orders equal in height, 

 the primaries slightly thicker, and all distinctly composed of two 

 laminae, not granular, but with close circular cormgations. 

 Alt. to summit of exsert septa 18, major axis 41, minor 19 

 millim. 



This singular and beautiful form of Sphenotrochus was repre- 

 sented by two broken fragments of calices which could not be 

 examined satisfactorily. It is unlike anything living or fossil 

 known to me. App. Off. Cat., No. 26, p. 37. Grey marls, 

 Hawke's Bay; V. Fig. 6, ideal restoration from fragments. 



Genus — Flabellum. Lesson, 1831. 



Corallum simple, more or less fan-shaped and compressed. 

 No columella. Epithcca abundant, often with lateral spines. 

 Septa very numerous, and the older orders so nearly equal that 

 they present the appearance of many systems. 



This large genus numbers now over sixty species, rather more 

 than half of which are fossil, and all belonging to the Eocene 

 and Miocene formations. The living species are generally tropi- 

 cal, but we have two or three in the temperate waters of Austra- 



