336 SIR SIDNEY F. HARMER ON 
median zooeciuin preceding the bifurcation, often with a row of 2-4 median 
zocecia. Rootlets arising from the proximal .members, mainly attached to 
the edges o£ the branches, some of them passing down the basal surface. 
Opesia oval, rather more than half the frontal length, with a moderate 
cryptocyst, extending completely round the opesia, and of practically equal 
width all round. Spines one external (rarely two) and one internal, at the 
distal end, the external spine placed rather more distally than the internal ; 
occasionally more numerous (fig. 46), the figure probably representing a 
zooecium in an early state of growth of a colony. Scutum wanting. Frontal 
avicularia single on most of the zocecia, those of some of the median zocBcia 
enlarged or even gigantic (fig. 48) ; much raised, directed obliquely 
proxiinally, and situated on the inner side of the zooecium, on the proximal 
side of the opesia, which they do not reach. Two frontal avicularia may 
be found on the axillary zooecium. Marginal avicularia small, often 
absent. Vibi-acula large, on the inner side of the lateral zocecia, placed 
nearly longitudinally, the rostrum or groove for the seta greatly pi'olonged 
beyond the main part of the vibraculum, and reaching the middle line of the 
branch ; a single vibraculum in the axil of the bifurcation. Ovicells large, 
longer than wide, the frontal surface rather flat, becoming concave just 
distally to the rim of the orifice of the ovicell. The surface is imperforate, 
and the ectocecium covers only a narrow part of the frontal surface. 
Bifurcation (fig. 20) as described below ; both branches jointed at their base, 
the joint involving the proximal end of the opesia of the outer zooecium. 
Type-slide (Brit. Mus.), 87.12.9.97, ' Challenger' Coll., Stat. 144a. 
In his ' Challenger ' Report, Busk described as Menipea marionensis 
specimens from the two following localities : — 
Stat. 142, off Cape of Good Hope, 150 fathoms ; Stat. 144 a., off Marion 
Island, 50-75 fathoms. 
On Oct. 4, 1910, the late Mr. G. M. R. Levinsen wrote to Mr. R. Kirk- 
patrick, at the British Museum, stating that a fragment of a ' Challenger' 
specimen of " Me7iipea marionensis," from Stat. 144 a, had come into bis 
hands, through the Dundee Museum, and that it proved to be a Caberea. 
On Jan. 26, 1911, he wrote further, to the effect that he had described and 
figured the species from Stat. 144 a, as Caberea kirkpatricki ; and, having 
examined material, from Stat. 142, which had been sent to him by 
Mr. Kirkpatrick, he had found that " the great plurality of the frontal 
avicularia are internal " in M. marionensis. In returning the material which 
had been lent to him, he added a label to the specimens from Stat. 144 a, as 
follows : — " Busk had wrongly named the specimen M. marionensis, the type 
of which is from Stat. 142, Cape of Good Hope." 
Levinsen died in 1914, and, although I have made every effort to satisfy 
myself on the subject, I have failed to find evidence that his results were 
published. It must be assumed that the description referred to in his letter 
