HAWAIIAN HOLOTIIURIANS— FISHER. 649 



Largest preserved specimen 165 mm. long, 50 mm. wide, 45 mm, 

 dorso-ventrall}^. 



Localities. — Tide pools in Puako Ba}', Hawaii; Kealakekua Bay, 

 Hawaii ; Kamalino Bay, N iihau ; Napili, Maui ; Waialua, Oahu. Twenty- 

 seven specimens. 



It is apparently characteristic of this species to have the mouth open 

 ventrally. The broad collar which surrounds it is always much con- 

 tracted in the preserved specimens. The difference ])etween the 

 ventral surface, which is rather flat, and the dorsal, which is well 

 arched, is very conspicuous and is heightened l)y a difference of color. 

 The pedicels extend to within 15 to 20 mm. of the rim of the circu- 

 moral collar or ruff', and to within 8 to lOjiun. of the anal aperture. 

 The papilhe are more numerous in some specimens than others, but 

 tend to become rather more crowded toward the anus, and along the 

 sides of the body adjacent to the pedicels, where they are also larger. 

 The papilla3 are also longer on the collar, particularly on its rim. The 

 numerous specimens which belong to this species vary considerably in 

 the shade of brosvn and in the amount of white. The more usual 

 coloration is a rich raw umber. An unspotted individual had the 

 dorsum deep olive brown, the ventral surface light pinkish ))rown; 

 tube feet raw umber; tentacles greenish brown or raw umber trans- 

 lucent, with grayish effects in some lights. Near Kealakekua Bay, 

 Hawaii, I collected one large specimen which is decidedly dark and 

 spotted. An example from Kamalino Bay, Niihau, is light olivaceous 

 brown, heavilv blotched on the sides with white and with all the dor- 

 sal papilla^ encircled with white. 



Calcareous ring rather massive. There is scarcely any difference in 

 size between the radial and interradial pieces. Ampulla^ of tentacles 

 long. Polian vesicles two, There are three madreporic bodies to the 

 left of the dorsal mesentery, free in body cavity. One madreporic 

 canal is usually much longer than the other tw^o, more or less con- 

 voluted, and frequently is median in position, lying in the dorsal 

 mesentery, (lonads form one cluster, resemlding a swab of hempen 

 tangles, on the left side of the mesentery. Right respiratory tree 

 reaching to calcareous ring, left only half as long, but more bushy. 

 Cuvierian organs present, forming a tuft to the left of the base of the 

 respiratory tree. 



The rods in dorsal perisome var}" considera1)l3' in shape in the same 

 individuals, the principal tj^pes being hgured. The}' vary in length 

 from COS to 0.14 nun., or are sometimes even longer. The rosettes 

 average from 0.02 to 0.03 mm., and are scattered among the rods. 

 They are congregated, however, m dense masses al)out the base of the 

 papilla?, giving the whitish color characteristic of some specimens. 

 Consequently in those specimens having consideraV)le whitish on the 

 body, the rosettes are very numerous. A few of the larger papillae 



