Boone, Echinodermata, Cruises of "Ara" and "Alva" 177 



Text figure 9. — Holothuria impatiens Forskal: a, upper figure a typical 

 table, lower figure a typical button; b, profile of table showing spire, also 

 crown of spire ; c, rod, from papilla ; all greatly enlarged. 



tively. The largest specimen measures almost nine inches long 

 in the contracted state. The general form of the living animal is 

 said to be subcylindrical, wider posteriorly, elongate, with the 

 dorsal and ventral surfaces apparently not well distinguished. 

 The mouth is terminal, small, with eighteen to twenty closely 

 crowded tentacles. The anal region is also terminal, devoid of 

 calcareous teeth. The peristome is wrinkly with a very charac- 

 teristic texture, being roughened by the spires of the calcareous 

 tables. The ambulacral appendages are pedicel-like "papillae" 

 borne on coarse verrucae, usually much lighter than the balance 

 of the peristome, rather regularly distributed but not in series. 

 They have a terminal plate. The deposits consist of tables and 

 buttons; these tables being so closely crowded that the margins 



