CEPHALODISCUS HODGSONI. 49 



of the stalk also. If this be so, the buds marked F, G, H, J, K, in fig. 73 

 are buds of a later generation than those marked A, B, C, D, E. 



In one case examined (fig. 71), two such secondary stolons were found. In 

 this case there are no buds on the main or parental stolon, one moderately large 

 bud and a larger bud with long thin stalk on one secondary stolon, and two 

 small buds on the other. In another case (fig. 69) there is a long-stalked bud 

 and a .secondary stolon arising from the parental stolon, three young buds and a 

 tertiary stolon at the end of the secondary stolon, and a small bud, a large bud 

 with plumes, and a larger, long-stalked liud arising from the extremity of the 

 tertiary stolon. 



DESCRIPTION OF CEPHALODISCUS HODGSONI (see p. 3). 



Material. 



The material of Cephalodiscus hodgsoni consists of eight specimens, of which five 

 (for convenience of subsequent reference here called A, B, C, I), E) were dredged on 

 the same day (January 29th, 1902) in 100 fathoms ofi" the ea.st end of the Barrier, 

 78° 16' 14" S., 197° 41' 47" E., where the bottom is described as consisting of " mud, 

 stones, and rocks." A sixth specimen (F) was obtained two days earlier and at a 

 greater depth (January 27th, 1902, 300 fathoms, off Barrier, bottom mud), while the 

 other two were obtained in the following year when the boat was in winter quarters, 

 specimen G on May 18th, 1903, No. 10 hole, 130 fathoms, and specimen H on June 

 3rd, 1903, No. 10 hole, 130 fathoms. 



The largest pieces are B (fig. 1, B, plate 2), C, and F. Unfortunately B and C 

 became partially dry and even frozen before being placed in the pre.servative fluid, 

 and the spines appear rather shrivelled. A is a fine piece, although considerably 

 smaller than B and C, and this specimen is made the type of the species (fig. 1, A). 

 Specimens E and H cou.sist of test only, without polypides. The former is a small 

 fragment of a colony growing upon a piece of Eschar a* Specimen G is a young 

 colony investing a piece of Retepora (see p. 52). 



Specimen D consists of three young colonies growing upon the same piece of 

 Menipea. From the appearance of these one would conclude that either the whole 

 of the polypides of each colony belong to one family, being produced by budding 

 from a single individual which settled in that situation (having itself been produced 

 sexually or as a bud from one of the individuals of a parent colony), or each of the 

 new colonies was formed by a crowd of migrants, a view which is supported by the 

 obviously gregarious character of the polypides of this species in particular. The 

 three colonies appear to be of about the same age, and there is nothing to lead one 



* I have to thank Mr. H. W. Buitows for naming the various Polyzoa found in association with the 

 Cephalodiscus. 



T 2 



