326 THE PROCEEDINGS OF THE LINNEAN SOCIETY 



which slightly overlaps the edge of the wall ; primaries and 

 secondaries equal in thickness and reaching the columella ; ter- 

 tiaries very nearly reaching it ; fourth and fifth orders very thin 

 towards the centre, but reaching fully two-thirds of the distance 

 to the centre ; fifth cycle very thin and small and reaching about 

 a fourth of the distance or even less. All orders entire for a 

 fourth of their length, and undulating, then deeply and narrowly 

 lobed, the fourth cycle dividing into narrow, tall, styliform pro- 

 cesses ; all very granular ; columella very little prominent and 

 consisting of a few broad and irregular granular lobes quite at 

 the bottom of the calice, easily distinguished from the septal lobes 

 being more closely granular and of more solid form ; endotheca 

 confined to a very few dissepiments between the higher orders 

 and primaries near the edge of the calice ; costsa (where visible 

 through the incomplete epitheca) quite laminar, corresponding to 

 the septa and slightly lobed, intercostal spaces deep, exotheca 

 rather abundant in horizontal or carved and inclined dissepiments. 

 Alt. 12 to 15, lower edge a third less ; diam. of calice 13 to 17, 

 millim. Depth about |- of alt. 



St. Vincent's Gulf, S. A. These specimens were sent to me by 

 Prof. Tate, F.G.S., who has not recorded anything of the stolon 

 or mode of increase, but I have no doubt that they should be 

 referred to the Astrangiaceae, though from the definition of Dr. 

 Bruggeman's genus Homophyllia, it does not seem easy to dis- 

 tinguish from descriptions alone, what that learned author most 

 relies upon as generic and specific in character. Perhaps it would 

 be better to remark that the septa in his genus are exsert, and 

 the teeth never become separate lobes. Of course this is sup- 

 posing there is no means of ascertaining the presence or absence 

 of a stolon. 



Cylicia quinaria, n. s. PI. 5, Figs. 3, a, b, c, d, e. 



Corallum cylindrical, adherent by its entire breadth ; height 

 equalling or exceeding the diameter ; costae, when present, thin, 

 with styliform lobes, and not corresponding with any of the 

 cycles, but quite irregular and separated by wide, smooth, inter- 



