670 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxii. 



even raore. Generally .speaking', the large buttons are found about 

 the base of the pedicels and papillte, being usually the innermost of 

 the group, while the small ones are found in the small intermediate 

 groups and around the outer edge of the ambulacral rings. The 

 majority of the buttons are of the smaller sizes, and are frequentl}^ 

 very irregular or even incomplete, the majorit}^ having about eight 

 perforations. In a specimen from Necker the buttons average a trifle 

 more regular than in the Auau Channel examples, and have about 

 eight holes, but here, too, there are a great many incomplete, (con- 

 torted, and generally irregular forms. A rather prevalent variation 

 is shown in 4(/', where a loop is formed over the central shaft of the 

 button, and odd processes grow out toward the center from the edge. 

 The supporting rods of the pedicels and papillae are numerous, curved, 

 expanded slightly at the tips and in the middle, where there are one 

 or two perforations on either side. The expanded tips are often per- 

 forated and the edge of the rods is thorny. Forms intermediate with 

 the large buttons are sometimes present. The}" have a number of 

 perforations along either side of the central shaft. In the papilla? the 

 rods frequently are more elaborate and have branches at the middle 

 which may or may not unite. When they do, a fenestrated plate, 

 which, however, retains its rod-like character, is formed. In the 

 papilhe also are many of the large tables. The end plate of the 

 papillae is verj' much reduced, but that of the pedicels is as usual well 

 developed. 



This species is characterized especially b}- having 30 tentacles, dorsal 

 papillae and ventral pedicels, two or three kinds of tables, one of 

 which has two or three crossbeams, irregular buttons disposed in 

 circular groups and rings. The number of tentacles and general 

 character of the deposits, as well as the ambulacral appendages, ally 

 this form to H. disci'ej^ans Semper, //. hnmofnlh Semper, and H. 

 sainoana Ludwig. ^voxw discrepant ^ hawaiiensis differs in having two 

 distinct kinds of tables, neither of which greatly resemble the figures 

 given by Semper;" in having the buttons not only about the ambu- 

 lacral appendages, but likewise in numerous intermediate groups, and 

 in having the buttons very variable in size and frequentl}' irregular 

 and large; in having differently shaped supporting rods; and, finally, in 

 color. The calcareous ring is very characteristic and may furnish an 

 additional difference. Neither immohills nor samocma are an}' more 

 nearly related to hawaiiansis than is discrepans. 



« Holothurien, 1§68, pi. xl, fig. 7, 



