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CEYLON PEARL OYSTER REPORT. 



Colochirus, sp. (?). 



Havelockia herdmani, n. gen. & sp. 



Adinopyga mauritiana (Quoy and Gaimard). 



Actinopijga serratidens, n. sp. 



Holothwia ku/rti, Ludwig. 



H. monncaria (Lesson). 



H. vagabunda, Selenka. 



H. tenuissima, Semper. 

 H. marmorata (Jiiger), 

 H. aim, Jiiger. 

 H. gallensis, n. sp. 

 Stichopus chloronotus, Brandt. 

 St. chloronotus, var. fusms, nov. 

 St. variegatus, Semper. 



In addition to these, the field notes made by Professor Herdman and Mr. Hornell 

 show that they observed two species (or varieties) of Psoitis, the one black and the 

 other grey, on the East Cheval Paar. 



So far as I am aware, this is much the largest collection of Holothurians that has 

 been yet obtained from the seas of Ceylon. Until about twenty years ago no 

 Holothurians had been definitely recorded from that coast. Owing mainly to the 

 work of Drs. Paul and Fritz Sarasin, of Mr. Edgar Thurston, of Madras, and 

 others, the number on record had lately reached the total of 37 species. Professor 

 Herdman's Holothurian collection, in addition to a number of the forms previously 

 known, contains at least 20 species and distinct varieties which are now recorded 

 from Ceylon for the first time, thus bringing the total number of known species and 

 varieties up to 57, as shown in the following list. The first column gives those 

 species reported by Mr. Thurston (19) from the Gulf of Manaar, the second those 

 described by Professor Jeffrey Bell (8), the third shows those collected by 

 Drs. P. and F. Sarasin, chiefly at Trincomalee, and described by Professor Ludwig (9), 

 the fourth those few collected by Professor Haeckel, and described by Dr. Walter 

 (18), and the fifth column gives those collected by Professor Herdman in 1902, and 

 described in the present report. 



List of Ceylon Holothurians. 



Name of Species. 



Synapta beselii, Jiiger 



S. grisea, Semper 



S. recta, Semper 



S. striata, Sluiter 



& sp. (? n. sp.) 



S. sp. (? n. sp.) 



Chirodota rufescens, Brandt . . . 



C'h. duhia, Semper 



Haphdactyla molpadioides, Semper 

 Hap. australis, Semper . . . . 



