362 
Ventral tubefeet with a large, regular end-plate, the dorsal tubefeet 
with a small, irregular one (Fig. 43.b); both sorts of tubefeet with 
a few, irregular spicules (Fig. 43.c) near the disk; similar spicules 
are found in the tentacles. 
The black colour must make this species very difficult to 
observe on the dark rocks, where it lives, and thus afford it a 
most effective protection. 
The nearest relative of this, both in regard to morphology 
and biology, highly interesting Holothurian would seem to be Pso- 
lidium gaini Vaney (Holothuries. II. Expéd. Antarct. Francaise. 1914. 
p. 18. PI. 1 . 7 — 9 , IV.6—14), which may well be suggested to belong 
in reality to Psolidiella, not to Psolidium s. str. 
The discovery of this species is due to the young Swedish 
zoologist, Dr. Sten Vallin, who paid a short visit to the Stewart 
Island in 1924, on a whaling trip to the Antarctic seas. 
18. Psolus neozelanicus n. sp. 
2 miles E. of North Cape, N. Z ; 55 fms; hard bottom. 2/1. 1915. 2 spe- 
cimens. 
The larger specimen is 10 mm long, with tentacles expanded; 
it has a short caudal appendage. The body of this specimen is rather 
high, but the somewhat inrolled edges of the sole show that this 
is not the normal shape. The second specimen, 7 mm long, with 
retracted tentacles, is very flattened (Fig. 44); no doubt this spe¬ 
cimen shows the natural shape of the body. Colour white. 
The scales of the dorsal side are fairly large, imbricating at 
least on the sides of the body; 4—5 scales between the introvert 
and the caudal appendage. The scales are set, not very closely, 
with small, sharp grains. The 
overlapping edge of the scales 
whitish. The introvert is sur- 
rounded by 5 large, interradial 
valves. Smaller scales are 
found at the base, the limit 
between the oral valves and 
the scales of the body being 
not very distinet. 3—4 circles 
of smaller scales round the 
Fig. -14. Psolus neozelanicus. Dorsal side. s/i. anal Opening. 
