NO. 1555. HA WAIIAN HOLOTHURIANS— FISHER. 669 



less marbled on l)ack with raw sienna (yellowi.sli); darlv brown al)out 

 base of papilla?, tip of latter lioht. Whole liod}^ closel}^ clotted with 

 white (the groups of buttons). A specimen from Necker {'i) has the 

 ground color Vandyke brown and the marbling is in the form of light 

 yellowish- brown areas al)out the papillae. Some papilhu of the type 

 have a light circle about the base instead of one of brown. Length, 

 45 mm.; width, about 12 mm. 



Localities.— Ty])e (Cat. No. 21212, U.S.N.M.) from Station 3876, 

 Auau Channel, between Maui and Lanai Islands, 28 to -lo fathoms; 

 sand, gravel (6 specimens); 3872, same locality, 43 to 32 fathoms, yel- 

 low sand, pebbles, coral (2 specimens); Necker Island (probably), (2 

 specimens). 



The tentacles in the dredged specimens seem quite constantly 30 in 

 number, but in a specimen from Necker there appear to be only 25. 

 Inasmuch as they are very retracted, it is entirely possible some have 

 escaped notice or been lost. The form of the tentacle possesses noth- 

 ing unusual. The pedicels are not alwa3's obviously arranged in three 

 rows unless full}^ expanded. When fully expanded, the dorsal papilla? 

 are pointed, the terminal plate being very rudimentar3\ 



The radial pieces of the calcareous ring are more than twice as large 

 as the interradial, but ])oth elements are of the usual shape. Polian 

 vesicle single, large. Madreporic canal single, free, on right side of 

 mesentery. The gonad is well developed, showing that the specimens 

 are adult. It consists of a thick tuft of simple strands, which are long. 

 Cuvierian organs well developed, forming a tuft at the junction of the 

 two branches of the respiratory tree. Left respiratory tree in con- 

 nection with the retemirabile of the inte.stine. 



The tables with a tall spire are numerous. There are also many 

 intermediates, between forms c and c/ (tig. 4, Plate LXVIII), individuals 

 with two crossbeams to the spire being more common than those with 

 three. The disks of the large tables vary in size, as may be seen bv 

 comparing h and c/, 0.073 and 0.063 mm. in diameter, respectively. The 

 tall spii'es commonly terminate in a small crown of as many as sixteen 

 teeth, frequently less regular than b. The small tables either have a 

 pyramidal form {c) or are more truncate (_/). In either case the disk 

 hardly ever reaches 0.06 mm. in diameter, 0.055 being the average. 

 The pyramidal form is connnonest, and the crown has eight to twelve 

 short teeth irregularly placed. Occasionally the rim of the tables 

 has a few very short teeth on the margin. This form occurs in the 

 san)e individual on which the smooth rims are prevalent. On the 

 whole the tables are rather variable, but the average is summed up in 

 the diagnosis. The most characteristic feature of the buttons is their 

 accumulation in circular groups, or fairly large rings surrounding the 

 base of pedicels and papilh\?, recalling H. pardalis. The buttons 

 vary greatly in size, the ordinary extremes of length being 0.034 to 

 about 0.12 mm., the numl)er of holes ranging from four to sixteen, or 



