244 



down lo an oval pore, and on L-itlier side of llie suliire we generally lind an 

 inner cavity belonging lo the two short s])ines, which meet in the latter. 



The lateral chambers. The scapular chaniher, which in contrast to that in the 

 ])rcceding species, has no beaked hook, is not everywhere developed as an avicu- 

 hirinni and is often absent on the one side of a single zoirciuni as well as of a 

 bizofficial internode. While the three distal lateral chambers together form a body 

 of a shape somewhat similar to that in the foregoing species, the extent of the 

 three chambers separately is diilVrenl, the scapular cliainl)er being dilated both 

 distally and jjroximally al the expense of the two other clianihers, and the sinus, 

 which in CI. (jcinindta is formed between Die scapular and the infra-scapular 

 chamber, is here formed by the former only, the septum between the two cliani- 

 hers having retreated much farther pro\inially. The supra-scapular chamber is 

 separated from the scapular by an angulated septum and has a lissure in its roof. 

 II is an extremely small, triangular or (piadrangular cavity, which together with 

 the distal part of the scapular chamber forms a rounded jirocess, the form and 

 position of which reminds one of the distal sjiines. The infra-scajjular chamber 

 is generally triangular and wholly calcified with exception of a small frontal 

 pore. The pedal chamber appears in the same way as in the foregoing species. 

 This may also be said of the above-mentioned chamber on the bizooecial 

 internode. 



The ooecium. The gonozoceciuni is a single zocrcium, and the covering keno- 

 zoircium is of the length of the gonozocrcium and has a depression along the 

 centre of the frontal surface, which is provided with a numlier of widely scat- 

 tered pores. The aperture, which is provided with two distally converging, arch- 

 shaped lateral margins, has a broad, Irapeziformly rounded sinus, the proximal 

 part of which is covered by the spines which meet in the sutural line. On either 

 side of the ai)erture we find a distally directed, strong, conical, lateral spine of 

 the length of the aperture, and outside this on either side a single, rounded (piad- 

 rangular, lateral chamber with a small rounded pore. 



Form of colony. Uni- and bi-zocecial internodes alternate, i)iit in such a way 

 that two bizod'cial internodes succeed each other rather frequently. The single 

 zooecia may spring from the <laughler-zooccia in rows of up to 5. They are 

 sometimes on the outer side provided with an avicularium, which may exceed 

 the zoa'cium in size, and such an enormous avicularium is found especially in 

 a form from Akaroa (New Zealand). 



Of this species I have examined colonics from Port Phillii), Auckland, Cape 

 Wilson and New Zealand. 



