416 PROF. J. A. THOMSON AND MR. W. D. HENDERSON ON [Apr. 10, 



Family Alcyoniid^. 



Alcyonmm 'pachyclados Kkinzinger. 

 Sinularia hrassica May. 



„ fungoides, sp. n. 

 Sclerophytum folydactylum (Dana). 



„ querciforme Pratt. 



„ marenzelleri Pratt { = Lobophytimi marenzelleri ?). 



,, hirtum Pratt. 



,, viride, sp. n. 



Lobophytum pauciflorum Ehrenberg. 



Alcyonium pachyclados Klunzinger. 



This species is represented by several typical, much-lobed, almost 

 rigid specimens of a greyish-white colour, with a greenish tint in 

 the surrounding spirit (due to zoochlorelhe ?). The colour was 

 originally like " cocoa-and-milk " and the expanded polyps were 

 dark brown. 



A short stalk of about 10 mm. I'ises from a broad base, and 

 bears several bi'oad lobes, each divided into blunt finger-like 

 lobules covered with polyps. The surface of the ccenenchyma 

 exposed when some of the polyps are removed is granular with 

 numerous small elliptical spicules. The tentacles are not dark in 

 colour, as iia Klunzinger's specimens ; they bear on their oral 

 surface 30-40 short pinnules, usually in four rows, but some more 

 fully expanded showed only two rows, one on each side. The 

 superficial spicules are small ellipses and figure-8 forms ; the deeper 

 spicules are for the most part relatively large, spinose, double clubs 

 and double sphei-es. The following measurements were taken of 

 length and breadth in millims. :— 0-09 x 0-05 ; 0-075 x 0-045 ; 

 0-07 X 0-04 ; 0-06 x 0-02 ; 0-05 x 0-01 5. We find more variety in 

 size than Klunzinger indicates, and some of the shapes are exactly 

 like those seen in adjacent species, such as A. hrachyclados^ A. digi- 

 tulattim,A. sphcerophorum. It seems to us that there is very little 

 difierence between the members of this group of species. 



Numerous ova occur in the lower parts of the polyps. 



Locality. Covering the shore at one place near Wasin ; also at 

 Kiungani, Zanzibai-. Previously recorded from the Red Sea, 

 Luzon, Zanzibar. 



Sinularia brassica May. 



This species is represented by a complete specimen, which 

 is about 50 mm. in height and 38 mm. in width across the capi- 

 tulum. The stalk of the colony is firm and erect, the surface 

 ,o-ranular. The capitulum is divided into three branches or lobes, 

 each of which breaks up into a large nimiber of small knob- like 

 bodies. 



The autozooids are abundant, but are either completely with- 

 drawn or just show the tentacles above the general surface. 

 Numerous small spicules are found in the autozooids when they 

 are dissected out. 



