COLLECTED ON THE ' CHALLENGER ' EXPEDITION. 351 



thin. In the older zo-oecia a small tubercular preoral process, 

 having on one side a minute avicularium with a subtriangular 

 mandible. In the older portions the individual zooecia are, for 

 the most part, obliterated ; and in those parts of the zoarium the 

 surface presents small pustular, sub hexagonal eminences, each of 

 which has a minute avicularium in its centre. Besides these 

 there are a few interspersed avicularia with spatulate mandible, 

 with a very contracted base. 



Hab. St. 167. Lat. 39° 32' S., long. 171° 48' E. ; 150 fms., grey 

 ooze. Off Marion Island, 50-75 fms. 



14. C. CYLINDRIFORMIS, n. Sp.* 



Char. Zoarium conical or tapering. Zooecia large, distinct. 

 Orifice orbicular, widely emarginate. A strong, incurved, cylin- 

 drical preoral process, supporting a large avicularium, with a 

 broad, equilateral, triangular mandible. Interspersed avicularia 

 not numerous, having a broad, short, membranous mandible, 

 either of a duck-bill form or squarely truncate. Ooecium small, 

 erect, globose, punctured. 



Hab. St. 142. Lat. 35° 4' S., long. 18° 37' E. ; 150 fms., sand. 



The only specimen is of a cylindrical form, about f " long by 

 0"*1 in diameter, appearing, but not certainly, to be moulded on 

 a worm-tube. 



15. C. Jacksoniensis, n. sp.f 



Char. Zoarium branched ; branches compressed. Zooecia barrel- 

 shaped, very distinct at the growing edge, elsewhere confused ; 

 surface granular, with a row of small perforations round the 

 border. Preoral process short, pointed, trifid, with an avicularium 

 on one side at the base, with a rounded mandible. Orifice orbi- 

 cularj, widely notched in front. On some of the lateral zooecia 

 there is a strong projecting rostrum with a lanceolate avicu- 

 larium, the beak of which is cupped and toothed. 



Hab. St. 163 a. Off Port Jackson, 30-35 fms., rock. 



16. C. Eatonensis, n. sp.§ 



Char. Zoarium multiform, massive, or branched, the branches 

 short, thick, and obtuse, or more or less lamellar, and free or 

 incrusting, or parasitic, and more or less globose. Zooecia (young) 

 barrel-shaped, afterwards ventricose; surface entire, smooth. 



* " Ohall. Eep." pi. xxx. fig. 9. t " Chall. Eep." pi. xxx. fig. 10. 



\ Not really notched. § " Chall. Rep." pi. xxix. figs. 4, 6, 8„ 



28* 



