NO. 1555. HAWAIIAN HOLOTIIUBIAXS— FISHER. 705 



with intermediate stages between 2 and 3<(. The small ellipsoids and 

 rods are very numerous, many as small as 0.18 mm. in length (2(?). 

 In a single individual all stages between tig, 1 of the dorsal surface 

 and 3 of the ventral are present, the series being l-2-3a-3. Since the 

 deposits are so variable in minute detail, the figures give a far better 

 conception than description can give. In the papilla? the rods are 

 practically identical with IJ and la., and vary in length from 0.2 to 0,6 

 mm. In pedicels such forms as 'Sh, oh', 3c/, 3d predominate, 3// being 

 at tip and about 0.2 mm, in length. 



Variations. — Tliere are two specimens out of the one hundred and 

 twenty-three odd examples of this species, which, if seen without the 

 others, might lead to some curious conclusions concerning the ganus. 

 One is from Station 404:1, the other from 3836, both hauls containing 

 also typical specimens. That from 3836 has about thirty pedicels along- 

 each ventro-lateral radius, disposed t/i two irregular i<erie-'i, somewhat 

 as in Scotodeiiiia. The inner pedicels, which are the smaller, usually 

 alternate with the outer, forming with them a sharply zig-zag series. 

 Scattered along mid-ventral radius are ten smaller pedicels, five of 

 them being in anterior third of body. Along each dorsal ambulacrum 

 about thirty papilla? in a doulde row. The specimen being rather 

 small (50 mm.), there is something peculiar in the deposits. Those of 

 dorsal surface are rather shorter and stouter than in tj^pical form, 

 being of the a, h, c, d, shapes (fig, 1); and in addition are many very 

 short stout rods (0.18 mm.) unsymmetrically branched at either end. 

 Deposits of ventral perisome are of 2J, 2c/, 2c\ 3c, 3d types, with few 

 spines. In addition are a few very small simple rods (2d) 0,05 to 

 0.08 mm. long, possibly larger rods in course of development. 



The second specimen (Station 4041) is 72 mm. long and has twenty- 

 six very small pedicels along the mid-ventral line (recalling Panni/chia) 

 forming a double row for about two-thirds the length of body. There 

 are about twenty-four pedicels along either side of ventral surface in a 

 single row. The numerous dorsal papilla? form a double row along each 

 ambulacrum. Deposits of dorsal perisome are slender, of the a, />, c, d 

 t3^pes (fig, 1), Those of ventral perisome consist of stout and slender 

 rods, the former modifications of fig, 2, 2« types, the latter of the la 

 type. They range from 0.15 to 0.45 mm. long, and have unusually 

 large robust spines. Of course the presence of a double ventro- 

 lateral series of pedicels and median ventral pedicels is quite al)normal 

 for this genus. Although the deposits are not typical the}' seem to 

 belong in with those of the other specimens. The presence of a 

 double row of dorsal papilhe recalls O. asper Theel, but the pedicels 

 and madreporic canal, as well as deposits, are difl'erent. There seems 

 to be no other course than to regard these specimens as very a])errent 

 examples of 0. i7h'<i(/nis. 



This species ditiers from (J. a.sper in the form and size of the 



