22 THOMSON, The Pennatulaceae of the Cape of Good Hope. 



but partly owing to the state of preservation of the 

 specimen, I am unable to state their exact arrangement 

 on the latter. The single branched tentacle described 

 for U. carpenteri was not observed. Spicules occur on all 

 external parts of the colony, stalk, rachis, autozooids and 

 their tentacles, they are also present in the inner part of 

 the stalk. The spicules of the inner part of the stalk 

 (of which there are only a few) and outer rachis are 

 very minute. The spicules from all parts have ribbed or 

 toothed margins. 



The spicules of the tentacles are long needles or rods 

 with ribbed or tooth margins — the longest are about 

 0*294 x 0030 mm. in size. The spicules of the outer 

 walls of the bodies of the autozooids are corpuscular or 

 plate-like ; they have short curved longitudinal lines on 

 their surface, but no nucleus similar to that described in 

 those of Umbellula carpenteri. The spicules of the outer 

 lower stalk are very similar to the last in shape, but 

 usually with a more entire margin. Their surfaces have 

 longitudinal lines like those from the body of the auto- 

 zooids. The largest are about o - i 104x006 mm. There 

 are also some needle-like spicules approaching those of 

 the tentacles in shape. The spicules of the outer upper 

 stalk are similar to those of the outer lower stalk but 

 broader; their size is about 01004 x 0*30 mm. The 

 spicules of the more internal part of the stalk are very 

 similar to the last in shape. 



My specimen shows a number of points of resem- 

 blance with Umbellula carpenteri, Koll. The following 

 points of agreement may be noted. They are both indis- 

 tinctly bilateral in regard to the arrangement of the 

 apical autozooids. The stalk has an upper and lower 

 enlargement. The siphonozooids are on both the dorsal 

 and ventral aspects of the rachis. The axis is mainly 



