164 Proceedings of the Royal Physical Society. 



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

 rock and stones and broken shells (one example). St. XX VIII., Biou Island 

 and Hobson Island aud adjacent islands, 2 to 8 fathoms, rock and sand 

 (one example). 



The species has been taken from the Andaman Islands, Amboina, 

 Borneo, Japan, the Philippines, etc. 



(10) Ophiothrix exigua Lyman, 1874. 



This species is represented by two well-preserved specimens from 

 different stations. 



Koehler (1904 and 1905), who has compared some examples captured 

 during the " Siboga " expedition with an example named by Lyman from the 

 Jardin des Plantes, has made some desirable corrections and important additions 

 to Lyman's original description. Koehler asserts that though no further 

 examples of 0. exigua had been found till the "Siboga" expedition, the 

 explanation is that they were designated by another name, doubtless owing 

 to Lyman's imperfect description. Koehler further asserts that certain 

 specimens in the museum in Vienna (from the Bed Sea), named 0. comata, 

 by Marktanner-Turneretscher, are in reality 0. exigua, and that two examples 

 from Amboina, which De Loriol (1893) named 0. comata on the assumption 

 that the Vienna specimens were correctly identified, are also examples of 

 0. exigua. Koehler has discussed this matter at length both in his " Ophiures 

 nouvelles ou peu connues," and in the " Siboga " reports. 



My specimens agree essentially with the amended description : the only 

 comment I venture to make is that the notch on the distal margin of the 

 ventral arm-plates is somewhat more marked than is shown in Koehler's 

 figure (1904). 



Both examples have a disc-diameter of 5 mm. and an arm-length of 

 18 mm. 



Localities. — St. I., East of Tavoy Island and Port Owen, 4 to 12 fathoms, 

 sand and broken shells and mud (one example). St. XX., High Island, 

 shore and 3£ to 9 fathoms, sand and shells or rock and sand (one example). 



The present is a new record for the Mergui Archipelago. But, owing 

 to the confusion that has undoubtedly existed between 0. comata and 

 0. exigua, it is difficult to say definitely what is the exact geographical 

 distribution of either of these species. 



(11) Ophiothrix hirsuta Miiller et Troschel. 

 There are eight examples of this species from five stations. Owing to 



