IIOLOTHUKIOIDEA. 201 



Holothuria inonacaria (Lesson). 



Psohis monacaria, Lesson, 1830. See also Theel (7). 



One specimen from Aripu reef (March 18th); and one specimen from northern part 

 of Gulf of Manaar (Stn. LIV.), 4 to 40 fathoms. 



Lengths, 75 millims. and 38 millims. 



The colour in alcohol is brown, with yellow rings around the papillae. The pedicels 

 are light brown. The tentacles are yellow. 



There are papillae on the dorsal surface, and pedicels on the ventral surface. At 

 the anterior third of the body the papillae are arranged in five distinct longitudinal 

 vows. In the posterior two-thirds they are more irregular. The pedicels are also 

 arranged in five more or less irregular rows on the anterior third of the ventral 

 surface, and they are more irregularly scattered over the remaining two-thirds. 



The mouth is surrounded by a crown of small papillae. 



Deposits : These agree with those figured by Theel. Although the Ceylon 

 specimens differ in the arrangement of the pedicels and papillae from Theel's 

 description of H. monacaria, yet I think there is no doubt as to their identity with 

 that species. 



Distribution : Indian Ocean, E. Indies, Australia, Pacific Islands. 



Holothuria vagabunda, Selenka. 



Stichopus (sub-genus Gymnochirota) leucospilota, Brandt, 1835. See also Selenka (1), 

 Semper (2), Theel (7). 



One specimen from the lagoon inside the Reef Galle. Length, 180 millims. 



This specimen agrees with the descriptions of the species. 



Distribution : E. Africa, Indian Ocean, E. Indies, Hong Kong, Pacific Islands. 



Holothuria tenuissima, Semper (2). See also Theel (7). 



Two specimens from the lagoon inside the Reef, Galle ; one specimen from off 

 Negombo (Stn. I.). Also elsewhere in Gulf of Manaar (Stn. IX.), 7 fathoms. 



Lengths of two specimens, which were in a very contracted condition, 130 millims. 

 Length of other sjaecimen, 80 millims. 



The specimens agree with the descriptions of the species. 



The pedicels, which are scattered irregularly all over the. body, are more numerous 

 on the ventral surface. The anus is slightly pentagonal, with a group of papillae at 

 each angle. 



The smallest of the specimens is evidently a young form, but it agrees with the 

 larger specimens in most respects. Its body wall is very thin, doubtless owing to its 

 immature condition. There is also a small circular area around the mouth about 

 1 5 millims. in diameter where the skin is much thinner and devoid of pedicels. 



2 D 



