160 TEANSACTIONS 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. 



