NO. 1555. HAWAIIAN HOLOTHURIANS— FISHER. 681 



ntiting" with two smallei- (radial), as Herouard" has figured for his genus 

 Allantis^ but the tentacles do notdilt'er a particle in size. Gonad forms 

 a good-sized tuft on left side of dorsal mesentery. Intestine follows a 

 long S-shaped course. Cloacal cavity large. lv('s})iratory tree large, 

 not in connection with intestinal vessel. 



Tables are very crowded, the disks overlapping as much as possible, 

 thereb}^ bringing the spires vmusually close together. In the general 

 perisome there are tables with smaller and larger disks, the former 

 about 0.08 to 0.1 mm. in diameter, the latter 0.13 to 0. 15 mm. Smaller 

 tables have a large central subcircular perforation and about eight to 

 twelve primary peripheral ones. As the tables increase in size smaller 

 perforations are interpolated at the end. Large disks have two to 

 three series of holes. Margin of disks irregular and often, in large 

 ones, produced into a few irregular tooth-like projections. The spire 

 is composed of four (rarely three) rods; these, extending some distance 

 above the transverse pieces of crown and often flaring somewhat, form 

 the four prominent teeth of the crown. One or two accessory denticu- 

 lations frequently occur near tip of primar}^ tooth, and one tooth may 

 be longer than the other three, especially in largest tables, thereb}" 

 causing irregularity. Occasionall}" also a hxrge tooth projects from 

 the side of one or two of the rods near the crown beams; or a tooth 

 may project fi'om one or more of these transverse beams, but tliis is 

 not common. The hole inclosed by tlie crown crossl)eams is subcircu- 

 lar as seen from al)ove. Spires of average tables are al)out 0.08 to 

 O.OST mm. in height. Pedicels apparently liave no supi)orting rods, 

 but their tables are much reduced in size, having a small annular disk 

 about 0.056 mm. wide. The spire, made up of four or three uprights 

 and one crossbeam, ends in four teeth, with occasionally an accessor}^ 

 horizontal tooth or two. At base of pedicels the tal)les are intermedi- 

 ate between this ver}^ reduced variety and the simpler forms of gen- 

 eral perisome. As a rule the tables are variable (in same individual), 

 scarcely two being alike, except in general features. This is especially 

 true of larger disks, both the general contour and that of the perfora- 

 tions being subject to great variation. The figures will serve to show 

 the typical forms. Beneath the tables occur very slender spicules of 

 different lengths. The}^ resemljle sponge spicules ver}^ closely and 

 are pointed at both ends or rounded. In length they range fi'oni 0.08 

 to 0.3 mm., or even more, in width from 0.002 to O.OOi nmi. approxi- 

 mately. These spicules are scattered and appear to be a constant 

 although inconspicuous part of the calcareous deposit. Terminal 

 plates of pedicels resemble those of Ilolothui'la rather more than the 

 form figured b}^ Ludwig for Mesothuiua hiulUpes. They are simple 

 perforated plates with irregular outlines, often elliptical, about 0.28 



«Holothuries provenant des Ciunpagneh de la Princess Alice, Resultats Coiiipag. 

 Scientif. Prince Monaco, fasc. XXI, 1902, pi. i, fig. 3 {Alluntls in(esiinalis). 



