REPORT OlSr THE HOLOTHIJRIOIDEA. 
121 
Habitat . — Bohol (Semper), (?) Africa and Australia (Semper), Sumatra and Macassar 
(Ludwig), Offack in Waigou Island (Lesson). 
(Mus. Hohn.) One indi^udual, 150 mm. long, from Hong Kong. Colour, yellowish or 
greyish-white, with some traces of a violet or bluish tone here and there, 
indicating the true colour of the living animal. Body quadrangular, with the 
mouth bent upwards and closed by five ridges or protuberances provided with 
processes. Anus dorsal, surrounded by five distinct teeth. A simple or 
alternating row of rather large conical processes is placed on each of the four 
angles, each row or angle ha\dng from twelve to sixteen such processes. The 
processes reach 15 mm. in length. Pedicels five to seven in breadth in each 
ventral ambiBacrum. Another specimen, 75 mm. long, obtained in the Gulf of 
Siam, has a brown colour and only three to four pedicels in breadth in each 
series. A third individual from Australia is pecuhar in that the left dorsal 
interambulacrum carries three protuberances, and the odd interambulacrum one. 
Colochirus jagorii, Semper, 1868. 
Body quadrangular. • Dorsal processes not very large, arranged in simple irregular 
rows along the ambulacra. Ventral pedicels, five to six rows in each series. 
Anus with five teeth. Deposits hke those in the preceding species. 
Habitat . — Singapore (Semper). 
The species is unsatisfactorily known. Semper omits to tell whether processes 
with papiUre are present also on the sides of the body on the boundary 
between the dorsal and ventral surfaces. If it be so, the species may 
probably be identical with the preceding one. 
Colochirus tristis. Ludwig, 1875. 
Dorsal appendages — large tubercles with papillae disposed in longitudinal rows. 
Pedicels of the odd ambulacrum about eight in breadth ; those of the lateral 
ambulacra about six in breadth. Anus with five small teeth. Deposits 
dehcate spheres and cups ; larger reticulate spheres ; and scales which in the 
dorsal integument reach a diameter of 2 mm. 
Habitat . — Zanzibar (Ludwig). 
Body-form unknown. Even the arrangement of the tubercles, whether they belong 
to the two dorsal ambulacra alone, is not fully clear. 
2. Pedicels, one or tivo, seldom three, rows in each ventral ambulacrum, 
Colochirus minutus, Ludwig, 1875. 
Body quadrangular. The two dorsal ambulacra with a few minute papillcC. 
Pedicels not very numerous, arranged in a double row along each of the three 
(ZOOL. CHALL. EXP. — PART XXXIX. — 1886.) 
