REPOKT ON THE HOLOTHURIOIDEA. 
41 
Habitat. — Station 232, Maj 12, 1875 ; lat. 35° 11' N., long. 139° 28' E. ; depth, 345 
fathoms; bottom temperature, 41 ‘1 ; green mud ; a single individual. 
With regard to the inner organisation, Anhjrodenna simile agrees mostly with the 
species before known, wherefore I refer to the descriptions of them. The reddish deposits 
(PI. II. fig. 5, c) are of a more circular form, and considerably smaller than in the other 
species. The second kind of deposits (PI. II. fig. 5, d) is also of a more insignificant size, 
and consists of an almost circular disk which is convex outwards, and pierced by three 
to four holes ; from the convex surface of the disk a crown rises, composed of two to four 
straight or irregularly curved rods which are directed outwards and connected with one 
another by one or more transverse beams. The diameter of these deposits, which are very 
scattered, is only 0‘064 mm. or less. However, near the posterior extremity of the body 
the deposits in question become more crowded and present a more irregular elongate 
form (PL II. fig. 5, e). 
The star-like aggregations of deposits (PL II. fig. 5, a) are very scattered, and consist 
of five to six spoon-like rods with the enlarged perforated extremities overlapping one 
another, and with the handles often uneven, pierced by some minute holes, and split at 
their ends. Length of the rods uj) to 0'48 mm. The central anchor-shaped rod runs out 
from a small basal ring (PL II. fig. 5, h), and measures in length about 0‘4 mm. or more ; 
the flukes are mostly broken off, and appear to be highly curved and rather rough. The 
teeth which surround the anal aperture are comj)osed of a firm network. 
Anhjrodeymn marenzelleri, n. sp. (PL III. fig. 1). 
Tentacles fifteen [Vj, each with three processes, the intermediate one being largest. 
Calcareous deposits of three different kinds ; aggregations of larger and smaller, rounded 
or oval, yellowish or reddish-brown bodies ; perforated plates with about six larger holes 
and with a long straight outwardly directed crown, composed of three rods connected 
with one another by several cross-rails, and split at their ends into several branched ends ; 
and more scattered plates of a very singular form, pierced by several minute holes and 
provided with about three rather long arms. Besides a smaller crown of some spinous 
processes, these later deposits are always in connection with a straight outwardly directed 
anchor-shaped rod, the base of which is perforated and discoidal and the flukes provided 
with one or more serrations. Colour in alcohol, reddish-violet, dappled. Length about 
26 mm. 
Habitat. — Station 169, July 10, 1874 ; lat. 37° 34' S., long. 179° 22' E.; depth, 700 
fathoms ; bottom temperature, 40'0; blue mud; a single incomplete individual. 
The tentacles are minute and retracted so that I am not quite sure of their number. 
The caudal portion of the body is broken oflf. The internal organs seem to be almost 
identical wdth those in the previously known species of Anhyroderma. The integument 
(ZOOL. CHALL. EXP. — PART XXXIX. 1885.) Q^l ^ 
