324 Proceedings of the Royal Irish Academij. 



(c) Bouble-chibs with still more open " heads," i.e., one whoii of warts on 



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

 warts. These approach rfwift/e-w/ice/s : 0"057 x 0'038; 0-057 x 0-034; 

 0-053 X 0-031. 



(d) lilore slender doMc-clvhs 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 douhlc-duhs which approximate to doxihle-spindles. The 



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

 0-057 X 0-023; 0057 x 0-021. 



(/) Double-spiiidles not markedly warty (in some there is hardly any 

 constriclion) : 0-057 x 0019; 0-057 x 0017; 0-057 x 0015. 



(f/) The type figured as (g) is evidently a developmental form of one of 

 the other types : 0-046 x 0023 ; 0046 x 0-022. 



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

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

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

 except one whicli is dicholomously branched ; the longest is 17 cm. in length. 



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

 ma.\imiim of 1 mm. 



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

 distinct Ijare tract, witli 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 arc slightly adpressed to the coenenchyma; 

 when retracted they are low and dome-like. They are very small, V)eing 

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



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 

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

 species. 



Locality, — Andamans. 



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

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



