The Marine Fauna of the Mergui Archipelago. 171 



line in the interradial space around the margin of the disc, and this is continued 

 along the arm at the base of the uppermost spine, on both sides of the arm. 

 A broader line of the same colour, about one-third the breadth of a ventral 

 arm- plate, also stretches along the median line of the ventral surface of each 

 arm. The centro-dorsal disc-plate is also indigo coloured. 



Locality. — St. XXII., Hastings Harbour, St Luke's Island, 3 to 20 fathoms 

 and shore, rock and sand (one example). 



This appears to be the first time this species has been found in the Mergui 

 Archipelago. 



2. CLADOPHIURJE. 



(1) Euryale studeri Loriol, 1900. 



This species is represented by seven examples from three stations. My 

 examples agree with the description and figures of Loriol (1900), who first 

 distinguished this species from E. aspera Lamarck. 



Localities. — St. II., East of Thamihla or Iron Island, 10 to 15 fathoms, 

 mud or sand and mud (four examples). St. XVII., West of Sir John Malcolm 

 Island, 13 to 18 \ fathoms, coarse sand and broken shells (two examples). 

 St. XXV., Gregory Group and Crichton Island, 4 to 14 fathoms, rock and 

 stones and broken shells (one example). 



Koehler (1907, p. 350) now considers the individuals taken by the 

 " Investigator " in the Straits of Malacca and Gaspar, and which he identified 

 as E. aspera Lamarck, to be in reality E. studeri. The species was also 

 found by the " Siboga " expedition in the Sulu Archipelago, north-west of 

 Borneo. 



(2) Astrophyton clavatum Lyman, 1865. 



There is but a single example of this species. 



It is a very large specimen, having a disc-diameter of over 50 mm., while 

 some of the arm-branches extend to about 400 mm. The arms show an 

 extraordinary amount of branching, and the radial ribs are very prominent. 

 The only point in which this splendid specimen of A. clavatum seems to 

 differ from the type is in having not only the radial ribs but also the inter- 

 brachial spaces on the dorsal surface of the disc closely and uniformly covered 

 with microscopic grains or thorny stumps. Professor Koehler, however, who 

 kindly examined this specimen, reports that he has seen other examples of 

 the species with similar uniform granulations. 



Locality. — St. XXV., Gregory Group and Crichton Island, rock and stones 

 and broken shells, 4 to 14 fathoms, dredge and diver (one example). 



While examples of the species have been found from Madagascar, Mauritius, 



