UMBELLULIDAE 



265 



Station 



181 

 12 March 1927 

 Palmer Archipelago 

 {cont.) 



182 

 14 March 1927 

 Palmer Archipelago 



366 



6 March 1930 

 S. Sandwich Is. 



Depth {m.) Remarks on the specimens 



160-335 terminal part of the axis ends in the dorsal wall of the primary autozooid, but does not 

 project spine-like (cf. Broch 1957). The axis is very thin but distinctly quadrangular. 



3, total length 47 cm. 



The primary polyp has been pushed to the inner side of the whorl by the dorsal 

 secondary autozooids (text-fig. 3, 5). Siphonozooids distinct between the autozooids, 

 a few with extended tentacles. Autozooids : body up to 2 cm., tentacles 1-2 cm. (In spite 

 of the much greater size, the cluster of the specimen has only one autozooid more than 

 the 14-8 cm. specimen figured by Jungersen (1907, PL i, figs, i, 2), with which it other- 

 wise agrees except in size of bodies of the autozooids which, according to Jungersen, 

 measure only up to 8 mm.). 



4, total length 90 cm. ; 5, total length 93 cm. 



The specimens were labelled U. magniflora by Mrs MacFadyen ; they are in a bad state 

 of preservation, but evidently showed the same features as specimen 6. 



6, total length 98 cm. 



In its upper part the axis is only 1-5 mm. thick and enters the centre of the bowl-shaped 

 ' bottom ' of the rachis, but from here it runs along the outer wall of the rachis to its brim, 

 terminating at the base of an autozooid seated on the inner side of a whorl of 1 5 secondary 

 autozooids. Inside this whorl the rachis is crowded by siphonozooids and seems hirsute 

 because of the extended tentacles. Some of the siphonozooids of the lower side of the 

 rachis also have extended tentacles. Typical magniflora. 



278-530 One specimen: total length 105 cm. 



Lower part of rachis bowl-shaped, axis entering its centre from below and disappearing. 

 A few of the external siphonozooids have extended tentacles. 1 2 autozooids form a whorl 

 along the brim, 3 more autozooids in the central upper field of the 'bowl'; the field is 

 covered with hair-like tentacles of otherwise invisible siphonozooids. A primary polyp 

 cannot be located. Some of the autozooids show the following lengths of body + tentacles 

 in mm.; 4 + 4; 4 + 35; 35+4; 3-5 + 2-S; 3 + 2-S- Typical magniflora. 



77-152 7 specimens. 



1, total length 24 cm. 



The axis enters the centre of the broadly obconic basal part of rachis from below and 

 disappears. 10 large autozooids (body up to 17 mm., tentacles to 22 mm. long) constitute 

 a basal whorl, and within it there are two additional irregular whorls of large autozooids. 

 The basal whorl recalls magniflora, but the additional autozooid whorls transform the 

 cluster into antarctica. 



2, total length 43 cm. 



Both autozooid bodies and tentacles up to 25 mm. long. Basal part of rachis bowl- 

 shaped, axis entering centrally and disappearing. One lower (marginal) whorl of 1 1 auto- 

 zooids, within it on a short spigot 3 irregular whorls. All interspaces between the 

 autozooids crowded with rather prominent siphonozooids with withdrawn tentacles. 

 Typical antarctica with the basal part of rachis like that of magniflora. 



3, total length 45 cm. 



Strongly twisted just below the cluster. Both autozooid bodies and tentacles up to 

 3 cm. Axis entering centrally from below, thence following the (dorsal) wall to disappear 

 in an interspace between two autozooids of the basal whorl. This consists of 1 1 polyps. 

 Within and above it, numerous crowded autozooids in 3-4 indistinct, very irregular 

 whorls. Siphonozooids in all interspaces between the autozooids, always with retracted 

 tentacles. Typical antarctica. 



4, total length 73 cm. 



Axis diameter about 2 mm. just above the holdfast, only i mm. near the cluster. Basal 

 part of rachis bowl-shaped, axis entering the centre from below and disappearing. 9 fully 

 developed autozooids along the brim of the ' bowl ' in a single whorl, a tenth indicated by 

 a bud. Diametrically opposite the bud one fully developed autozooid (the primary 

 polyp?) is seated on the inner side of the whorl. Autozooid bodies 1-5-2 cm. long. 

 .Siphonozooids on the 'bowl' below the autozooids seemingly crowded into radial fields, 

 no siphonozooids visible inside the autozooid whorl. Typical magniflora. 



5, total length 86 cm. 



Axis as in 4, entering the bowl-shaped basal part of rachis in the centre from below, but 

 abruptly making a bend to one (the dorsal?) side and following the wall to the brim. There 

 are 10 autozooids in a whorl round the brim of the 'bowl', and the axis lies in a narrow, 



