12G CEYLON PEARL OYSTER REPORT. - 



Family : CELLEPORID.F. 



Cellepora albirostris (Smitt, 26). 



Localities : Gulf of Manaar ; off Mount Lavinia ; off Kaltura ; and off Galle, deep 

 water. There are large quantities of this species. 



Cellepora megasoma, MacGillivray (23). 



There is usually a raised avicularium to one or both sides of the orifice on the 

 present specimens and large scattered spatulate ones here and there. The zocecia are 

 smooth or slightly ridged. Ocecia thickly punctured all over, with no marked area. 



Localities : Off Galle and onwards up west coast of Ceylon, deep water ; Gulf of 

 Manaar (several colonies on worm tubes and stems of Zoophytes) ; Station XXXTL, 

 off south-east coast of Ceylon (on Sponge). 



Cellepora rota, MacGillivray (23). 



Localities: Station LIIL, north of Cheval Paar, 7 to 10 fathoms; and elsewhere 

 in Gulf of Manaar. 



Cellepora cidaris, MacGillivray (23). 



There is a large quantity of material resembling the description of this form 

 excepting that the columnar processes in between the zocecia are solid instead of 

 hollow. C. albirostris, Smitt, has, in the " Challenger " collection, occasional, solid 

 columns of this sort on the older parts of a colony, but, although the two species 

 C. albirostris and C. cidaris of the present collection resemble each other pretty 

 closely in some points, neither the long pointed rostrum, nor the broad one with 

 serrated beak, nor the dark operculum, characteristic of C. albirostris, are present on 

 the specimens I have considered to be C cidaris. Ocecia, said in C. cidaris to be 

 globular and immersed, have an arched area in front, which, being often absent, leaves 

 a cave-like space. There are occasional large sjmtulate avicularia to be found on 

 raised areas in between the zocecia, but these are the only points of difference to be 

 seen betAveen the present specimens and MacGillivray's description of C. cidaris. 



Localities: Off Mount Lavinia; Station XL., off Galle, 34 fathoms; and in Gulf 

 of Manaar. 



Cellepora compacta, n. sp. Plate, fig. 17. 



Zoarium incrusting, white or purplish in colour. Zocecia small, upright, rounded, 

 smooth, with a few marginal punctures. 



Orifice rounded, with a loop-shaped sinus, and below, rather to one side, a large 

 thick rostrum, sometimes pointed above, having a long pointed avicularium on its 

 side ; often other slenderer jjrocesses round the orifice and long hollow columns in 

 between the zcecia. Ocecia standing upright, smooth and shining, with a narrow 

 arched ridge in front. 



Locality : Gulf of Manaar. 



