1910.] FROM MERGUI ARCHIPELAGO. 185 



Station XXXII. S.W. of Domel Is. 

 Bottom. Sand and mud. 

 Depth. 26-29 fathoms. 



Thy one fusus var. papuensis. 



Station XXXIII. Christmas Is. Group. 

 Bottom. Rock, sand, and mud. 

 Depth. 8-23 fathoms. 

 Colochirus cucumis. 



Moscos Islands. 



Cucumaria semperi. 

 Thy one sacellus. 



Cucumaria imbricata Semper. 



Ocnus imbricatus Semper, 1868 (7).* 



Ocnus javanicus Sluiter, 1880 (9) ; Lampert, 1885 (13). 



Ocnus imbricatus Lampert, 1885 (13). 



Ocnus typicus Theel, 1886 (15). 



Ocnus javanicus Theel, 1886 (15). 



Ocnus typicus Luclwig, 1887 (17). 



Cucicmaria imbricata Ludwig, 1891 (19); Sluiter, 1901 (20); 

 Pearson, 1903 (21) ; Koehler & Vaney, 1908 (22). 



One specimen from Station VII. Haycock Is. 



This specimen agrees in every respect with the descriptions of 

 Semper and Theel. The body has a total length of 40 mm. and 

 is bent 8o that the trivium is on the convex side. There are 19 

 pedicels on each of the five ambulacra. The deposits are typical 

 and agree with the sizes given by Theel. 



General distribution. Bohol, Java, Hongkong, Ceylon, Bay of 

 Bengal. 



Cucumaria semperi Bell. 



Cucumaria semperi Bell, 1884 (12) ; Lampert, 1885 (13) ; 

 Theel, 1886 (15). 



Two specimens : — 



One from Station XIY. Bushby Is. Length 20 mm. ; breadth 

 6 mm. 



One from Moscos Islands. Length 15 mm. ; breadth 6 mm. 



In the larger specimen the pedicels are arranged in five double 

 rows. The smaller specimen is much crushed and the arrangement 

 of the pedicels is hard to determine. The colour of the two speci- 

 mens, which is yellowish- white in spirit, does not agree with the 

 colour of the ' Alert ' specimens described by Bell. 



The calcareous ring (text-fig. 18 B) is one-sixth as long as 

 the body. Both the radials and inter-radials have short triangular 

 anterior prolongations. The radials also have long posterior 



* The numbers in brackets refer to the Bibliography, pp. 193 & 194. 



