78 Proceedings of the Royal B'ish- Academy. 



(c) Douhlc-chihs with still more open ' heads," i.e., one whorl of warts on 

 either side of the constriction, and the " hub " with only about three 

 warts. These approach fZoiiJ^e-M'/tce/.s : 0*057 x 0-038; 0-057 x O-OSi; 

 0-053 X 0-031. 



[dy More slender double-chd)s with a proportionately longer constriction, 

 and with no definite arrangement of the warts of the " heads," which 

 might be termed .divaricate : 0-053 x 0-031; 0-053 x 0-027. 



(e) More elongated doxMe-duhs which approximate to double-spindlcs. The 

 warts are large, but have no definite arrangement : 0-061 x 0-023 ; 

 0-057 X 0-023 ; 0-057 x 0-021. 



(/) DoMe-spindles not markedly warty (in some there is hardly any 

 constriction): 0-057 x 0019; 0-057 x 0-017; 0-057 x 0-015. 



{(j) The type figured as {g) is evidently a developmental form of one of 

 the other types : 0-046 x 0-023 ; 0-046 x 0-022. 



A small portion, about 20 cm. long, of a primary branch of what has 

 evidently been a large colony occurs in the Littoral Collection of the Indian 

 Museum: twenty-seven secondary branches arise from it; all are simple 

 except one which is dichotomously branched ; the longest is 17 cm. in length. 



The surface of the coenenchyma is granular ; the thickness attains a 

 maximum of 1 mm. 



The polyps are disposed irregularly ; on the primary branch there is one 

 distinct bare tract, with a fairly deep groove, the other is not so evident ; on 

 the secondaries it is almost impossible to detect a bare streak. 



The verrucae when expanded are slightly adpressed to the coenenchyma ; 

 when retracted they are low and dome-like. They are very small, being 

 about 1 mm. in diameter at the base, and varying from 0-5 to 1 mm. in height. 



The canal system is typical of the species. 



The axis is cylindrical and yellowish ; it is composed of concentric 

 laminae, and there is a distinct white core which is more calcareous than the 

 outer laminae. There is a slight trace of grooving on the surface. The 

 anthocodiaie and spicules agree in every detail with those described for the 

 species. 



Locality. — An damans. 



Note. — This specimen is described in the table given in the Indian Ocean 

 Littoral Alcyonaria Eeport (Thomson and Simpson) as specimen M. 



