280 SYNCORYNE DECIPIENS. 



GONOSOME. — Planoislasts borne on short peduncles in a dense cluster imme- 

 diately below the tentacles. Umbrella with its transverse and vertical diameters nearly 

 equal, its outer surface set with scattered thread-cells, and having two well-marked meri- 

 dional furrows extending along the middle lines of two opposite interradial spaces from 

 tlic summit of the umbrella to its margin, while two nearly obsolete furrows may occa- 

 sionally be seen ocupying a similar position in the remaining two interradial spaces ; 

 marginal tentacles very extensile, nodulated with clusters of thread-cells, which give 

 them a moniliform character when extended, one larger cluster terminating the 

 tentacle ; tentacular bulbs with a distinct ocellus. 



Colour. — Body of hydrantli deep orange, becoming paler wlieii it passes into the pale orange 

 stem; maiuibriuni and tentaculai- bulbs of medusa deep orange. 

 Development of Gonosome. — April. 



Habitat. — Rooted to the bottom of rock-pools near low-water mark. 

 Bat Ji //metrical dislrihution. — Lower part of Literal zone. 

 Locality. — Skelmorlie and Rotlisie, Firth of Clyde (G. .J. A. ). 



Si/ncoryne pulchella, though of humble habit, is yet conspicuous by the l)right orange colour 

 of the hydranths and medusa-buds. Paler varieties, however, may occur. It is nearly allied to 

 the Syncoryne decijxiens of Dujardin, with which it agrees in the form of the planoblast, and in 

 the fact that these are all borne at the proximal side of the tentacula. From Syncoryne decipicns, 

 however, it differs in its simple habit, and in the more ovate form and more numerous tentacles 

 of the hydranth. 



With Syncoryne eximia also the present species closely agrees in the form of the planoblast, 

 though the position of these on the trophosomes of the two species are very different. The 

 planoblasts, indeed, are scarcely distinguishalde from one another, except in the fact that the 

 longitudinal furrows of the umbrella do not exist in Syncoryne eximia. 



*;}^* C. SY^xouYNE DECIPIENS, Bujardin. 



Syncoryne decipiens (trophosome), sthenyo (planoblast), — Dujardin, iu Ann. Scr. Nat.j 3ieme 



ser., 1845, tome iv, p. 

 275, pi. xiv, fig. B. 



TROPHOSOME. — Hydkocaulus branched, attached by a creeping stolon, and 

 invested by a smooth perisakc. Hydranths nearly cylindrical, with eight or nine 

 tentacles. 



GONOSOME. — Planoblasts produced immediately below the tentacles of the 

 hydranth ; transverse and vertical diameters of umbrella nearly equal, a longitudinal 

 furroAv in the middle of each interval of the radiating canals ; marginal tentacles 

 moniliform, with clusters of thread-cells, and having an ocellus in the bulbous base. 



