NO. 1655. HAWAIIAN HOLOTHURIANS— FISHER. 689 



Owing to the fact that the animals have rid themselves of most 

 of their viscera it is difficult to tell exactly what the life habit may 

 have been. The body is much depressed, and on the best preserved 

 specimen the narrow serrate brim is easily seen. This is especially 

 well marked in the vicinity of the anterior end, and causes the mouth 

 to be ventral. The marginal papilhe are here close together but far- 

 ther caudad are more spaced. They arise from fairly broad conical 

 bases and are about 2 to 3 mm. in length. Pedicels are about same 

 length and have a well-developed terminal disk. Pedicels and lateral 

 papilla? are apparentl}" in about equal numbers, although on account 

 of injuries to the margin some of the latter have been rubbed off. 

 Dorsal papillae are larger than the laterals, being aliout 4 to 5 mm. 

 long in a contracted state. Although found in the neighborhood of 

 each dorsal ambulacrum they are not at all regularly arranged, some- 

 times forming transverse rows of three or four, or occurring isolated 

 here and there in the middorsal region. 



Calcareous ring is rather small, the interradial pieces being very 

 much reduced. The ligure (Plate LXXII, tig. ly) will sufficientWshow 

 the form. Madreporic canal single, running forward in dorsal mesen- 

 tery to become attached by the madreporic bod}' to body wall at ante- 

 rior edge of mesenter}'. King canal and proximal portion of radial 

 canals conspicuous. No tentacular ampullar hanging free in bod}" cav- 

 ity. Polian vesicle single, large. Gonad divided into a right and a 

 left tuft. Tubules twice dichotomously branched, their walls contain- 

 ing C-shaped deposits. Respiratory trees fairh^ well developed, com- 

 posed of a right and left branch springing from a common base and 

 over half as long as animal. Wall of cloaca crowded with C-shaped 

 deposits, which are present also in the wall of intestine, but in not 

 nearly so great numbers. Longitudinal muscle bands single, ribbon- 

 shaped. 



In the type specimen the calcareous deposits have been severely 

 injured by acid. The figures have been drawn from deposits of a 

 smaller specimen, which is much contracted and distorted. Most of 

 the perisome had been scraped off of specimens from this station. 

 The tables of the ventral perisome are smaller and simpler than those 

 of papilhe and their intermediate neighborhood. These tables have 

 usually an annular disk with four large holes formed by the simple 

 diagonal bars, but occasionall}' the ring is incomplete, or one or more 

 small peripheral holes may be present, as indicated in the figures. 

 (Plate LXXII, figs. 1, 1 J.) Disks of this type measure 0.046 to 0.08 mm. 

 in diameter, and the spires (fig. Id) are commonl}^ 0.067 to 0.09 mm. 

 high, with three to five crossbeams. The interval between the first 

 and second beams is alwavs greater than that between the others. 

 The upright pieces are nearly parallel and terminate in four simple 

 teeth. These tables are commonest in the ventral and lateral peri- 



