ALCYONARIA FROM SINGAPORE. 525 



Previously recoi-ded from the coasts of Western Africa and the 

 West Indies (Pallas and Esper) ; the Mermaid Straits, Dampier 

 Archipelago, and N.W. Coast of Australia (Studer) ; Port 

 Denison, Queensland, and Torres Straits (' Alert ' Coll.) ; Mauritius 

 (Coll. Brit. Mus.) ; Admiralty Islands (' Challenger ' Coll.) ; and 

 Sumatra (Brundin). 



Family Melitodid^. 



Genus Melitodes. 

 M. ALBiTiNCTA Ridley. 



This species is represented by numerous fragments, but none 

 of these represents an entire colony. The specimens were taken 

 in 15 fms. of water from Blakang Mati. 



Previously recorded from Port Molle, Queensland. 



Genus Psilacabaria. 

 P. GRACiLLiMA Ridley. 



Psilacabaria graciUlma, n. gen. et sp., Ridley, Rep. Zool. Coll. 

 H.M.S. ' Alert,' Alcyonaria, p. 363. 



After a lapse of nearly three decades this delicate little species 

 is to be recorded once more. It is represented in the collection 

 by four portions of colonies, which show the mode of branching 

 and length of the internodes, and by sundry fragments. ISJ^one 

 of the colonies are complete, but the largest intact portion 

 measures 45 mm. in height. The intei'nodes vary in length, the 

 majority, however, fall within the range given by Ridley, viz. 

 12-16 mm. The branches are much more delicate than those of 

 the type, measuring only 1-2 mm. in diameter, as compared with 

 3-7 mm. In the mode of branching, size of polyps, and details 

 of spicule-distribution the Singapore specimens resemble the 

 type very closely. The spicules show the typical shapes ; but 

 they are in each instance somewhat smaller than their prototypes. 

 The colour of the ccenosarc and polj^ps is fawn, that of the axis 

 white. 



Locality. Salat Sinki, in 4-5 fms. 



Previously recorded from Port Molle, Queensland, 12-20 fms. ; 

 Port Darwin, 8-12 fms. ; E. Australia, 42 fms. (Ridley). 



Genus Wrightella. 



W. ROBUSTA, sp. n. (PI. LXII. fig. 9 ; PL LXIII. fig. 15.) 



This species has been formed to include a single well-developed 

 colony, which agrees more closely with Wrightella Gray (1870) 

 than with any of the other genera of the family Melitodidfe. 

 The form of the colony difiers, in its stouter dimensions and in 

 its erect position, from the members of the four existing species 

 of Wrightella ; but it was thought expedient to associate it with 



