SYSTEMATIC ACCOUNT 



231 



which measures 3 mm. across the longer diameter, is surrounded by four long spines 

 and leads into a funnel-shaped cavity. Two spines project obliquely upwards from the 

 branch and are attached to its sides by a plate of coenoecial substance which spreads as 

 a web between the spines and the side of the branch. Lower there is another small ostium 

 which has two spines, one at each end of its long diameter. 



The spines are thick and blunt but are fewer than those of Form A. While fourteen 

 spine-tips were counted in an ordinary short branch of Form A, not more than eight or 

 nine are found in Form B. They are only rarely forked. Many of the spines that are 

 seen projecting freely from the surface of the coenoecium are embedded for a considerable 

 proportion of their total length in the 

 coenoecial wall. These embedded parts 

 were at one time free spines, but were 

 later covered by the growth of the 

 coenoecium, and the support thus given 

 was used as skeletal structure on which 

 the tubes were lengthened. As the 

 growing tubes thus closed round the 

 basal parts of the spines, these con- 

 tinued to elongate by the deposition 

 of coenoecial material at their tips, so 

 that they kept a constant length. 



The short branches are fewer than 

 those of Form A. In one specimen, for 

 a distance of 5 cm., there are only six 

 short branches, and in another, for a 

 distance of 6 cm., only eight short 

 branches were counted. 



Besides the two distinct types of the 

 species already described two speci- 

 mens were obtained, one from station 167 and the other from station 187. Since both 

 were dead colonies they cannot be definitely called new forms. Although the coenoecium 

 shows a general structure greatly resembling that of C. hodgsoni, I do not venture to 

 base my conclusion entirely on the structure of the coenoecium without examining the 

 zooids. I shall therefore only describe the two pieces, and leave a definite identification 

 to the time when inhabited colonies are obtained in sufficient quantity. 



PI. XXXIII, fig. 4 is a photograph of the specimen obtained from station 167, and 

 Fig. 3 is a short branch of the same. The main stem produces along its sides a number 

 of secondary branches, and one secondary branch is connected with the main stem by 

 a lateral bridge. This bar suggests a resemblance to C. dodecalophiis , but while the 

 connecting bars of C. dodecalophiis (M'Intosh, 1887, p. 4) are solid, the one in this form 

 is traversed by the cavity of the secondary branch and main stem. 



The main cavity is continuous through the colony and the coenoecial wall is 3 mm. 



Fig. 3. C. hodgsoni. A short branch of the single specimen 

 obtained from St. 167. o, ostium; c, cavity of coenoecium. 



