58 SPOLIA ZEYLANICA. 



There appears to be no doubt that the five forms described 

 under the five different specific names given above should 

 really be included under the same name. This has previously 

 been suggested by Theel (42), Koehler & Vaney (17), and 

 the present writer (33), although Koehler & Vaney united 

 only the four species vitiensis, tenuissima, koellikeri, and 

 Clemens under the name H. tenuissima. Since, however, 

 H. vitiensis was first described, that name takes precedence of 

 tenuissima. I have added the fifth species, similis, which 

 does not appear to differ from the other four, except according 

 to Semper (38) in the possession of true papillae all over the 

 body. This form has not been re-discovered since Semper 

 first described it. Seeing that so many mistakes have been 

 made in differentiating true pedicels and papillae, and since 

 the appendages of marmorata, argus, and vitensis show every 

 gradation between true pedicels and undoubted papillae, 

 oae is justified in regarding similis as being identical with 

 H. vitensis. 



There are three specimens in the present collections. One 

 specimen was obtained by me recently on the Ceylon Pearl 

 Banks, and I am therefore able to supply a description of the 

 living animal. 



External Characters. — The ambulacral appendages are 

 pedicels, scattered amongst which are what appear to be true 

 papillae. In the living animal the colour of the bivium is 

 light brown with numerous minute dark brown spots, which, 

 when closely examined, prove to be brown rings around the 

 bases of the pedicels. In addition there are about a dozen 

 larger spots of a darker hue very irregularly disposed along 

 each side of the bivium. These spots are, however, quite 

 different from the circles of H. argus. The trivium is white, 

 and the pedicels show up faintly owing to their being of a 

 slightly darker colour. Along each side of the body some of 

 the pedicels of the bivium are surrounded by yellow rings. 

 The contrast between the bivium and trivium is well marked, 

 not only on account of the differences of colour, but also 

 owing to the presence of a slight longitudinal ridge along each 

 side of the body. After the specimen was placed in spirit 



