446 DISCOVERY REPORTS 



As a result of the absence of the larger sizes of large long-headed avicularia in my 

 material of var. magna there is no noticeable difference from var. elatior in range of size, 

 but the upper head-angle is usually more obtuse in the latter form. Waters's specimen, 

 attributed to var. magna by Kluge, was also without large long-headed avicularia of 

 maximum size. 



Fig. 43. Avicularia of Camptoplites giganteus and of some varieties of C. bicornis. A-E. C. bicornis var. 

 quadriavicularis var.n. From the type-specimen, St. 160, Shag Rocks. A. Small round-headed. 

 B. Large round-headed. C. Small long-headed. D. Large long-headed. E. Mandible of large round- 

 headed avicularium. F, G. C. bicornis var. quadriavicularis var.n. From the specimen from St. WS 871, 

 off Patagonian Shelf. Small long-headed not figured. F. Large long-headed. G. Round-headed. 

 H-L. C. giganteus (Kluge). St. WS 33, South Georgia. H. Round-headed. I. Mandible of round- 

 headed, oblique lateral view. J. Large long-headed. K. Small long-headed. L. Mandible of round- 

 headed avicularium. M. C. bicornis var. compacta (Kluge). St. TN 339, Ross Sea. Round-headed 

 avicularium. N. C. bicornis var. elatior (Kluge). St. 180, Palmer Archipelago. Round-headed avi- 

 cularium. 



fl. flange, pt. point. 



A small specimen from St. 39 (South Georgia) has no round-headed avicularia, but 

 is otherwise typical, and in the large colony from St. 180 (Palmer Archipelago) the 

 avicularia are all of the small long-headed type. 



