NO. 1555. HAWAIIAN HOLOTHURIANS— FISHER. 655 



coarser tubercles. Occasionally triradiate rods occur, y^vy rarely 

 quadriradiate; again, one end may be considerably expanded and per- 

 forated, or along one side there may occur from one to several short 

 •'outgrowths" at right angles. The rods vary from 0.1 to 0.3 mm. in 

 length; 0.15 to 0.25 is the commonest average. Tables with a simple 

 annular disk, about 0.0-1 to 0.06 nmi. in diameter, and with or without 

 perforations at the base of the spire supports are most numerous. 

 Rarely larger disks are present, 0.086 mm. in diameter and with twelve 

 to. tif teen holes around the rim. The rim of the reduced disks is nearh^ 

 always very uneven, often irregularly spiney, the spines being short 

 and broad. A few tables with only an incomplete spire are present, 

 the supports branched at the bottom but not joined into a ring. The 

 crown is subquadrate, about 0,01:5 mm. in diameter over all. The 

 tables resemble those of IloJothnrkb atra^ but are smaller, the spires 

 being relatively lower. The resemblance lies chiefly in the small disk 

 and twelve teeth. The papilhe have a terminal perforated plate, and 

 the pedicels a somewhat larger one. 



This species has a wide distribution, as evidenced by the following- 

 localities: Hawaiian Islands, Philippines, Sunda Islands, Java, Tahiti, 

 Batjan andSamoan Islands, Boninsima, Enosima, Mauritius, Seychelles, 

 Zanzibar, Mozambique (Theel, Lampert), and several other interme- 

 diate localities. It occurs between tide limits, and on the west coast 

 of Hawaii was found in rock pools. On the reef at Honolulu it occurs 

 in pools near the outer edge, well toward Waikiki. 



HOLOTHURIA PERVICAX Selenka. 



Plate LXVIII, tigs. 2, 2<i-c. 



Holothuria perricax Selenka, Beitrage zur Anatomie u. Systematik der Holo- 

 thurien, Zeitschr. f. Wiss. ZooL, XVII, 1867, p. 327, pi. xviii, fig. 54. 



Tentacles nineteen to twenty, usuall}" twenty, with flat yellow crowns. 

 Mouth directed ventrad, the circumoral collar not conspicuous. Dor- 

 sal surface arched, with scattered papillae; the ventral with numerous 

 pedicels which, under favorable conditions, can be seen to form four 

 bands. Each lateral and the two dorsal interambulacra have an irregu- 

 lar series of low (in preserved specimens) tubercles surmounted by a 

 good-sized papilla. The other papilhe are smaller. Body wall moder- 

 ately thick, the surface smooth to the touch. Deposits : Tables not well 

 developed, with small rounded disks, smooth but uneven on the mar- 

 gin, and with rather reduced spire, consisting of four upright pieces, 

 one crossbeam, and a crown ending in four simple teeth or irregular. 

 Frequently the upright pieces are not connected by transverse beams 

 at summit. The small rods are irregular, deeply incised, warted or 

 undulating along the margin; very numerous. Color in alcohol, very 

 pale dull yellowish or grayish brown. The back is marked by about 

 Proc. N. M. vol. xxxii— 07 42 



