262. TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 
Stalk more or less round in transverse section with 4 
longitudinal grooves marking the position of the 4 inter- 
radial muscles, decreasing in diameter from its junction 
with the umbrella and then expanding again at its 
aboral end into the disc for attachment. 1-chambered. 
(The other species of Haliclystus have the stalk 4 cham- 
bered.) 
Arms 8, but so closely united in pairs, that there appear 
to be only 4, separated by 4 very wide perradial “‘ bays,” 
the interradial intervals being practically obliterated. 
Primary tentacles 8. The 4 perradial ones are smaller 
than the secondary tentacles but similar in form, they 
stand out horizontally from just within the margin of the 
umbrella. The 4 interradial ones spring from the point 
of junction of the paired arms, between the tufts of second- 
ary tentacles and resemble the latter. 
Secondary tentacles are grouped in tufts on the ends 
of the arms, about 7 on each, but in consequence of the 
fusion of the arms in pairs, there appear to be only 4 
tufts of tentacles, each of about 15; really each con- 
sists of the tufts belonging to a pair of arms together with 
what I regard as the intervening interradial primary ten- 
tacle. The tentacles are somewhat club shaped, the head 
not being distinct from the stalk. 
Gonads. These consist of numerous saccules forming 4 
adradial bands in the endoderm lining the subumbral wall 
of the 4 perradial gastral pouches. These walls are very 
much folded, and in transverse sections the whole gastral 
cavity appears almost packed with the genital saccules. 
Size. Height including stalk—about 7 mm. Width of 
umbrella—about 3 mm. 
Colour. A rather dull pale yellow. 
