468 DISCOVERY REPORTS 



Description. This species differs from Camptoplites areolatus (Kluge) in the absence 

 of the calcareous projection from the basal wall ("kleine halbmondformige, kalkige 

 querscheide " of Kluge), in the asymmetrical origin of the axillary rootlets, in the longer 

 opesia, in the shape of the larger type of avicularium, and in the ovicells. 



In C. areolatus zooecia E and F at the bifurcation are in contact for some distance 

 (Fig. 54 A), the actual bifurcation occurring at about the level of the proximal end of the 

 opesia of zooecium E (lettering as in Harmer, 1923). When an axillary rootlet is formed 

 it arises from the usual type of symmetrical, more or less triangular, axillary chamber, 

 with a pair of distal runners. In C. asymmetricus zooecia E and F are only joined by 

 a small proximal connecting process, the bifurcation occurring beside the opesia of 

 zooecium B (Fig. 54 C). The axillary chamber takes the form of a tube running from 

 the axil along the side of zooecium E and giving rise to a rootlet at a point nearly half 

 way along the side of the zooecium. A runner is sometimes formed and passes along 



Fig. 55. A, B. Camptoplites areolatus (Kluge) St. 175, South Shetland Islands. C, D. C. asymmetricus 

 sp.n. 87.12.9.188 3 . Challenger St. 320, off Patagonian Shelf. E, F. C. asymmetricus sp.n. St. 156, 

 South Georgia. G, H. C. reticulars (Busk). 87. 12.9. 187. Challenger St. 147, off Crozet Islands. 

 Avicularia. 



the side of zooecium F. The greater separation of zooecia E and F and the condition 

 of the axillary chamber may perhaps be correlated with the more complete differentia- 

 tion of the joints in C. asymmetricus, if this difference in the joints proves to be a constant 

 feature when more material is examined. 



The large avicularia are a little longer and less curved than those of C. areolatus 

 (cf. Fig. 55 A, C and E), this flattening of the head being particularly marked in the 

 specimen from South Georgia (Fig. 55 E). 



The ovicells show a faint, fine, radial striation on the entooecium (Figs. 53 D, 54 D). 

 In the material that I have examined there is no sign of this being superseded by any 

 other sculpture, and the ectooecium remains incompletely calcified. 



In both C. asymmetricus and C. areolatus the distal communication pores are more 

 irregular in size, shape and number than Kluge supposed, and there is a tendency to 

 thickening of the intervening portions of the wall (Fig. 54 B, D). 



The Challenger specimens, which have been made the types of C. asymmetricus, were 

 included in Bugula reticulata by Busk. They differ from the type-specimen of that species 

 in the presence of joints, in the asymmetrical axillary rootlet-chambers and the absence 

 of runners from the lateral chambers, in the presence of a cryptocyst, and, as far as the 



