348 MR. G. BUSK ON THE SPECIES OF CELLEPORA 



imperforate. Orifice arcuate or subtriangular, with three (some- 

 times four) internal denticles within the lower border, about 

 0"'006-0" , 007 wide. Rostrum (sometimes absent) a small rounded 

 tuberosity, supporting on the summit, seated in a shallow de- 

 pression, a minute avicularium with a semicircular mandible ; a 

 strong articulated spine on each side of the orifice. Large inter- 

 spersed avicularia apparently vicarious (certainly not rostral), 

 usually immersed, but sometimes more prominent, and partially 

 erect, with a short, broad, duckbill-shaped mandible, shutting 

 down into a shallow boat-like beak, the edge of which is finely 

 pectinate. 



Hab. St. 186. Lat. 10° 30' S., long. 142° 18' E. ; 8 fms., coral- 

 sand. 



This well-marked species is at once recognizable by the long, 

 articulated and indistinctly jointed oral spine on each side of the 

 orifice. The limited development of the rostrum, with its little 

 imbedded avicularium, is also a well-marked feature, as is also 

 the fine pectination of the border of the cup in the interspersed 

 avicularia. Another curious feature is the frequent occurrence 

 on the surface of the zoarium of lengthened tubular processes or 

 tunnels, looking like enormously elongated zocecia. The nature 

 of these curious appendages is very obscure. 



7. C. columnaris, n. sp.* 



Char. Zoarium expanded, thick, irregular in form and extent. 

 Zooecia very deeply immersed, ventricose, but with the outlines 

 very obscure ; substance of wall solid, porcellanous ; surface 

 finely granular. Orifice semicircular, lower lip straight and 

 entire. A long, solid, tapering, columnar process springs from 

 the back or side of the zoarium close to the orifice. In many 

 zooecia there is a small tubercular avicularian process in front 

 below the orifice, which also sometimes rises in a columnar form ; 

 mandible triangular. 



Hal. St. 162. Off East Moncceur Island, Bass Strait, 38- 

 80 fms., sand, 



8. C. honolulensis, n. sp.f 



Char. Zoarium massive, irregular. Zooecia very confusedly 

 crowded, deeply immersed ; surface finely granular, imperforate. 

 Orifice (primary) semiorbicular or sub triangular, lower border 



* " Chall. Rep." pi. xxix. fig. 11. t " Chall. Rep." pi. xxix. fig. 5. 



