346 ME. G. BUSK ON THE SPECIES OE CELLEPOEA 



gular rounded, about 0" # 006 in diameter. Preoral rostrum small, 

 conical, obtuse, most frequently represented by a mere transverse 

 tuberosity. On the back a very minute avicularium with a semi- 

 circular mandible. Ooecium partially recumbent, free, with a 

 wide arched opening, and frequently with a round pore on each 

 side in front. Interspersed avicularia rare, columnar, vicarious. 

 Mandible blunt, triangular ; beak obtuse, not toothed. 



Sab. St. 163 a. Off Port Jackson, 38-45 fms. 



The open honeycomb aspect of this form and the peculiar 

 habit (if constant) are very characteristic at first sight. 



4. C. ZAMBOANGENSIS, n. Sp.* 



Char. Zoarium expanded thick, loosely adnate ; surface uneven, 

 but not distinctly mamillated. Zocecia distant, very confusedly 

 disposed, obscurely punctured round the border ; the interspaces 

 are sometimes irregularly cancellated ; surface porcellanous. 

 Primary orifice suborbicular or slightly coarctate ; operculum 

 suborbiculo-triangular. Preoral rostrum small, conical, obtuse, 

 presenting on one side near the base a very minute avicularium, 

 with a semielliptical mandible pointing upwards. Interspersed 

 prominent avicularia with a short duckbill-shaped mandible and 

 simple non-serrated beak ; very rarely one of large size, com- 

 pletely immersed, with a long spatulate obtuse mandible very 

 wide at the base. 



Sab. Off Zamboanga, 10 fms. 



In the figure the orifice is represented as notched on one side, 

 but the apparent notch is merely caused by the projection of the 

 base of the rostrum, and the rostral avicularium is represented 

 larger than it should be. 



5. C. albieosteis, Smitt.f 



Discopora albirostris (forma typica), Smitt, Florid. Bryoz. part ii. 



p. 70, pi. xii. figs. 234-239. 

 ? Cellepora bispinata, Bk. Brit. Mus. Cat. p. 87, pi. cxx. figs. 1, 2. 



Char. Zoarium massive, irregularly lobate, cristseform, erect or 

 partially incrusting sponges or fucus. Zocecia (marginal) barrel- 

 shaped ; surface pearly, smooth or finely granular ; imperforate, 

 or with a few punctures round the border. Orifice (primary) sub- 

 orbicular, or arcuate ; two long, very slender, unarticulated oral 

 spines above. Rostrum (when fully formed) very long, straight 

 and acuminate, solid, with a minute avicularium, with seini- 



* " Chall. Eep." pi. xxx. fig. 7. t " Chall. Eep." pi. xxxiii. fig. 7. 



