112 SIDNBT P. HARMEE. 



part is convex towards the left side ; in most cases with an 

 odd number of zooecia, the dominant number of which 

 appears to be 11. Branches arising fairly high in the inter- 

 node, usually from the Srd, 4<th, or 5th zooecium of either side ; 

 nearly always given off in perfectly regular alternation on 

 opposite sides of the axis. Each internode with an odd number 

 of zooecia is normally provided with a single branch, while the 

 even-numbered internodes are, with rare exceptions, branch- 

 less. Joints of the zoarium and of the rootlets nearly always 

 jet-blackj except in the youngest parts of the colony. Basis 

 rami situated very low down on the zooecium, and appearing as 

 if wedged in between the zooecium which bears it and the next 

 zooecium below it on the same side. Zooecia entirely adnate 

 with the exception of a short portion, of variable length, which 

 bears the aperture, and which is bent forwards^ a pointed pro- 

 jection sometimes occurring at the outer and upper angle of 

 the aperture. Ovicell large, always high in the internode, 

 usually near the end of a branch, and, like the zooecia, more 

 thickly covered with pores than in the other British species ; 

 its aperture inconspicuous, not borne on a prominent tube. 

 Rootlets usually with black joints, which occur at more fre- 

 quent intervals than in C. ramosa. (See also measurements 

 on p. 159.) 



C. luxata. — 



(1) Fleming.—' Hist, of Brii. Animals,' Edinburgh, 1828, p. 540. 



(2) CoTJCH. — ' Cornish Fauna,' part iii, Truro, 1844, p. 99, pi. xviii, fig. 3. 

 C. denticulata. — 



(3) H. Milne-Edwaeds.— " Mem. sur les Crisies," ' Ann. Sci. Nat.,' 



2e ser., ' Zool.,' tome ix, 1838, pi. vii, fig. 1. 



(4) Johnston. — 'Brit. Zoophytes,' 2nd ed., London, 1847, p. 284, pi. 1, 



figs. 5, 6. 



(5) Caetjs. — 'Prodromus Faunae Mediterranese,' vol. ii, Stuttgart, 1889, 



p. 39. 

 C. denticulata (pars). — 



(6) Busk. — 'Cat. Marine Polyzoa Brit. Museum,' part 3, 1875, pi. iv, 



figs. 1 — 4. 



(7) HiNCKS.— 'Hist. Brit. Marine Polyzoa,' London, 1880, p. 422, 



pi. Ivi, figs. 7, la. 



