122 CEYLON TEARL OYSTER REPORT. 



Allman's description, except for the addition of the gonothecse. This colony and the 

 larger colonies evidently belong to the same species, so that I do not hesitate to call 



Fig. 4. Halicornaria insignis. About \ natural size. 



them all Halicornaria insignis, and to add the description of the gonosome, previously 

 unknown. 



The gonothecae resemble those of H. bipinnata, Allman (1). They are of the same 

 colour as the hydrothecas, obconic in form, one side more convex than the other, 

 truncated above, and attached below, by a short stem, to the hydrocladia below its 

 lowest hydrotheca. As the hydrocladia are opposite and closely set, the gonothecae 

 form a thick double row up the stems. 



There are some specimens of the little bivalve mollusc Avicula (Margaritifera) 

 zebra, Rekve, attached to these colonies, and so coloured and banded as to present 

 the appearance of being part of the Zoophyte. 



Locality : Pearl banks, Gulf of Manaar. 



Halicornaria setosa, Armstrong (7). 



The specimen from off Kaltura differs from the others very much in appearance, 

 owing to the pinnae being less fasciculated and twice as long, but this does not seem 

 a sufficient reason for making a new species, unless, when more material has been 

 examined, other special characteristics are found. 



Locality : Off Mount Lavinia and Kaltura, and on the Cheval Paar, Gulf of 

 Manaar. 



