HOLOTHURIOIDEA. 191 



The number of the pedicels on each of the five rows shows some variation, one 

 specimen only having from eight to ten pedicels in each row, whilst those of the 

 0. javanicus type have as many as from twenty to twenty-three. The average 

 number, however, in each row is about eighteen. In one specimen the rows of 

 pedicels showed a somewhat irregular arrangement. In the anterior half of the body 

 all of the five rows are in a straight line. At the middle of the body, however, each 

 of the rows makes a deviation and then continues to the posterior end of the body in 

 a straight line. So that the five rows in the posterior half alternate with the five 

 rows in the anterior half of the body. 



Another specimen which is very much flattened dorso-ventrally is remarkable in 

 having the pedicels arranged in distinct rows only on the trivium. At a rough 

 glance the bivium appears to be altogether devoid of pedicels, and it is only on a very 

 close examination that a few very small and irregularly scattered pedicels can be 

 distinguished. 



The character of the scales is not similar in all the specimens. 



It happens that all the individuals which I had identified as 0. typicus are 

 yellowish-white, in alcohol ; and the two others (the 0. javanicus form) were of a 

 dark brown colour. 



The deposits in all the specimens are very similar, and agree with the description 

 of 0. typicus given by Theel. 



Distribution : Hong-Kong, Bay of Bengal, Java, Ceylon. 



Cuciunaria conjungens (Semper) (2). 



One specimen from Pearl Banks, Gulf of Manaar. Length, 14 millims. 



The specimen agrees very closely with Semper' s description, both in the nature of 

 the deposits and the calcareous ring. 



Owing to the small size of the specimen, the arrangement of the dorsal pedicels 

 into three rows, as described by Semper, is not very clearly marked. The pedicels on 

 the ventral surface are much more numerous than the dorsal pedicels and are 

 irregularly scattered. 



The body tapers at both ends, being more pointed at the posterior end. 



This is recorded from Ceylon for the first time. 



Distribution : Bay of Manilla, Ceylon. 



Thyone fusus (Muller), var. papuensis, Theel (7) Plate I, figs. 7, S. 



Two specimens from the Gulf of Manaar (Stn. IV.), 6-9 fathoms. 



Lengths, 25 millims. and 22 millims. 



The body is pointed at both ends. The pedicels are scattered all over the body, 

 but show an arrangement into longitudinal series not only on the ambulacra hut 

 also on the interambulacra. Tin's arrangement is somewhat obscure in some parts of 

 the body. 



