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



Family A L c Y o N 1 1 D .E. 



Alcyonium pacliyclados Klunziiiger. 

 Sinularia hrassica May. 



„ fangoides, sp. n. 

 Sclerophyimn jiolydactylum (Dana). 



„ querciforme Pratt. 



„ inarenzeUeri Pratt ( = Lobophytnm marenzelleri ?). 



,, Mr turn Pratt. 



,, tnride, sp. n. 



Lobophytum paiicijlorum Eliienbei-g. 



Alcyonium pachyclados Klunzinger. 



This species is i"epresented byseveial typical, miicli-lobed, almost 

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

 the sni'rounding spiiit (due to zoochloiella' ?). The coLmr was 

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

 dark blown. 



A short stalk of about 10 mm. rises from a broad base, and 

 bears several bioad lobes, each divided into blunt finger-like 

 lol)ules covered with polyps. The surface of the canienchyma 

 exposed when some of the polyps ai-e removed is granulai' with 

 numerous small elliptical spicules. The tentacles are not dark in 

 coloiu-, as in Klunzingei's specimens ; they bear on their oral 

 surface 30-40 short pinnules, usuall}' in four rows, but some more 

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

 superficial spicules are small ellipses and figui'e-8 forms ; the deeper 

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

 and <louble si)hei'es. The following measiu^ements were taken of 

 length and bi'eadth in millims. :— 0-09 X 0-05 ; 0-075 x 0-045 ; 

 O-o'T X 0-04 ; ()-0(i X 0-02 ; 0-05 x 0-015. We find more variety in 

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

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

 talatnm, A. sphn^rophorxmi. It seems to us that theie is \'ei-y little 

 dift'eience between the members of this group of species. 



Numeious ova occur in the lowei- paits of the polyps. 



Locality. Covei-ing the shore at one place near Wasin ; also at 

 Kiungani, Zanzibar. Previously recoided 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 aci'oss the capi- 

 tuhnn. The stalk of the colony is firm and erect, the sui-face 

 gianuliir. The capitulum is divided into three branches oi' lobes, 

 each of which breaks up into a large number of small knob like 

 bodies. 



The autozooids aie abundant, but are either completely with- 

 drawn or just show the tentacles above the geneial sui'face. 

 Niunerous small spicules are found in the autozooids when they 

 are dissected out. 



