EEPOKT ON THE HOLOTHUPJOIDEA. 
173 
Colour in alcohol— ventral surface light yellowish-grey; dorsal surface darkish 
hrov-n, inclining to greenish, excepting the papillae and a space round their base which 
are yellovdsh-white. When the animal is wrinkled and contracted the dorsal surface gives 
the impression of being transversely streaked with brown and yellowish-white. 
The calcareous ring is of the usual shape without posterior prolongations. Two 
ventral Polian vesicles are present, one of which measures about 100 mm. in length. 
A single dorsal madreporic canal is present. The genital organs are destroyed. 
The deposits bear the closest resemblance to those in Holothuria pardalis, Selenka, 
&c., but the tables are devoid of spines on the disks, and the buttons are more 
uniformly crowded beneath the former all over the body. The numerous tables 
(PI. YIII. fig. 10, a, h, c) have the disk small and smooth, and the spire composed of 
four rods united by a single transverse beam. The spire terminates in about eight 
or more teeth. The tables are about 0'048 mm. high, and their disks measure up to 
0*056 mm. in diameter. The buttons (PI. YIII. fig. 10, d), which are usually pierced 
by six holes, vary slightly in size, but the larger ones have a length of 0*068 mm. In 
the pedicels and papillae the buttons often grow slightly larger, and are sometimes 
pierced by more than six holes. The pedicels bear near their ends irregularly rounded, 
perforated plates or even more elongated rod-like ones, which are of a more or less 
marked bilateral shape (PI. YIII. fig. 10, e). Besides larger spinous or perforated, 
irregular rods resembling those in the pedicels, the papillae carry small, more or less 
curved, simple or branched, spinous rods (PI. YIII. fig. 10,f,g); the small supporting 
rods of the papillae measure only 0*05 mm. in length, while the larger ones are 
0*2 mm. long. 
Holothuria minax, n. sj). (PI. YIII. fig. 8). 
Body elongated, slightly flattened on the ventral surface and furrowed along its 
middle. Tentacles eighteen. Anus roundish. Yentral surface with pedicels. Dorsal 
surface wdth small conical papillae, a number of those situated along the sides of the body 
and in the neighbourhood of the dorsal ambulacra being placed on low warts with a 
broad base. The papillae at the mouth and anus are slightly larger. Deposits of two 
kinds — tables w*ith the rounded disk perforated by a central large opening and a series 
of smaller peripheral holes, and bearing a short spire composed of four rods and one 
transverse beam, and terminating in about twenty teeth or spiues ; and oval, regular 
or asymmetrical smooth buttons with six to ten (or more) holes. Pedicels strengthened 
by more or less symmetrically bilateral, perforated rods. Papillae with perforated rods 
commonly of a more irregular shape. Colour in alcohol, light yellowdsh-brown ; the 
ventral surface and the warts lighter. Length in contracted state about 160 mm., 
but probably much greater when the body is fully extended. 
