CABEREA 381 



type). The figured specimen (pi. v, fig. 1) from Auckland Island lent me by Dr Marcus 1 

 is, however, rather different. Its zooecia are about the same size as those of the minima 

 type, but it has a more granular cryptocyst and a scutum with a longer narrower distal 

 lobe and a longer stalk, and, although a small process is present, the scutum is not con- 

 nected distally with the opposite cryptocyst. 



It is unlikely that Stach's record of C. darwinii (1937, p. 378) from Lady Julia Percy 

 Island, Bass Strait, was based on true C. darwinii. 



I have been unable to trace Busk's specimen from Cumberland Island, recorded in 

 the B.M. Catalogue as C. boryi, and later (1884) referred to C. darwinii (see p. 373 above). 



I have examined C. boryi Waters (1905 a) from Cape Horn, kindly lent me by the 

 Manchester Museum, and find that it is a specimen of C. darwinii approaching the 

 minima type. I agree with Marcus that it may confidently be assumed that both Jullien 

 (1888) and Calvet (1904) had C. darwinii. It is clear from Calvet's statement of distri- 

 bution that he did not distinguish C. boryi and C. darwinii, and there is no evidence that 

 true C. boryi has ever been found in the South American region. 



It is hardly necessary to mention that Busk's pi. xxxii, fig. 5 c, does not represent a 

 Caberea. The young Cellaria from which it was drawn is still attached to the type- 

 specimen of Caberea minima. 



C. glabra MacGillivray (Fig. 23 E), whose resemblance to C. darwinii was noticed by 

 Marcus (1921&, p. 91), remains to be considered, and my material has been insufficient 

 to settle its position. Two typical colonies from Port Phillip (Bracebridge Wilson Coll. 

 88 . 1 1 . 14 . 422, 97 . 5 . 1 . 238 2 ) closely resemble the minima type of C. darwinii. The chief 

 distinction lies in the absence, in C. glabra, of the little condyle-like process at the base 

 of the stalk of the scutum, to which the operculum articulates in C. darwinii (cf. Fig. 

 23 D, E). As a result, the scutum appears longer-stalked in C. glabra, although the stalk 

 is often stouter and the lobes less clearly marked off from it than they are in C. darwinii. 

 The distal lobe of the scutum is usually narrower and often pointed and turned a little 

 forwards (i.e. frontally), whereas, in C. darwinii, it is broad and blunt, but there is a 

 good deal of variation. No zooecium of typical C. glabra has been seen with three outer 

 spines as is sometimes seen in the minima type of C. darwinii, but the peduncular spine 

 may be long and stout. In both C. darwinii and C. glabra a small inner spine, distal to 

 the peduncular spine, may be present. The frontal avicularia are on the whole larger in 

 C. glabra than in the minima type, and the one on the median zooecium at a bifurcation 

 is often the largest, though not greatly enlarged in typical specimens. As in the minima 

 type, the cryptocyst may be smooth or granular. The presence of C. glabra at South 

 Trinidad Island, off Brazil (Terra Nova Coll.), in latitudes comparable to those of its 

 Australasian localities, suggests that it is a further term in the darwinii series (see p. 382), 



1 It is mounted on the same slide (I 86) as the figured specimen of C. zelandka from Juan Fernandez. 



2 There is also a colony from Port Phillip (Hincks Coll. 99 . 5 . 1 . 378), identified by Hincks with C. darwinii, 

 which agrees with the Wilson specimens, and the same characteristics are seen in colonies from Tasmania 

 (99.7.1.888, 34. 1. 18. 4), South Australia (99.7.1.887), Port Phillip (1938.8.2. 1, 99.5.1.392), New 

 Zealand (St. 934 and St. TN 144). Stach (1937, p. 378) recorded C. glabra from Lady Julia Percy Island 

 in Bass Strait. 



