113 
than elsewhere ; are close together, often overlapping ; are less regu- 
lar and more varied in form; while the brown bodies are fewer, and 
grouped to form large irregular compact masses. 
The plates on the body have generally 3 or 4 large circular holes, 
occasionally 2 or 3 additional smaller ones ; and from the centre rises 
a vertical column composed apparently of three rods united by several 
short transverse bars: it terminates in a trifid point. 
These plates measure about 0-2 mm. across ; the spines are 0-1 mm. 
high. On the tail the number and size of the perforations in the plates 
vary much, but are usually much more numerous than in the body- 
plates. 
Locality —(?)South of Chasland’s (South Island), 43 fathoms, fine 
sand.* 
Remarks.—Two species of “ Trochostoma” (which Lyman Clark 
merges into Molpadia) have been dredged off the East Cape of New 
Zealand by the “ Challenger”: from each of them our present species 
differs. 7. wiolaceum has spicules of quite a different form—great 
three-armed plates that are almost solid. From TZ. albicans the 
presence of coloured ovoids sufficiently distinguishes it. The plates 
in our species rather recall those of T'. antarcticum from Kerguelen, 
which, however, has no coloured bodies in the skin. 
I am unable to identify it with any of the species of Molpadia 
enumerated by Dr. Lyman Clark, 1907. 
Chirodota gigas Dendy. 
Chirodota gigas, Dendy and Hindle, Journ. Linn. Soc. (Zool.), xxx, 
1907, p. 110. 
Station 12. 
Several badly preserved specimens, whose very dark violet in- 
tegument was nearly wholly macerated away, fragments only being 
left here and there with the groups of characteristic wheels. 
The longest individual measures 230 mm. by 12mm. _ This is more 
than twice the length of the type of the species obtained from Chatham 
Islands. 
Dendy says nothing of the colour of his specimen, and possibly 
my identification is erroneous. 
Locality.—Molyneux Bay, 20-46 fathoms, sand. 
[I have others, collected many years ago by Mr. G. M. Thomson 
off Stewart Island. These measure from 130mm. to 170mm. by 
39 mm. across the widest part of the body, which is the anterior end. 
They are, however, very soft, so that the above figures exaggerate 
the true size. ] 
* The vial in which this and Caudina were enclosed bore the number “ 7,” 
but I am inclined to think that this species came from deeper water off the coast 
of the North Island. 
