POLYZOA. 125 



pointed, mandible. There are sometimes small, raised, rounded avicularia scattered 

 over the front wall of the zooecium in great profusion. Some of the specimens have 

 spinous knobs in front of the ooecia and also one on the summit of this. 



Altogether, with the addition of the usual six long marginal spines of the orifice, 

 the colony has a formidable appearance, especially in specimens where the zooecia are 

 crowded together. The largest colony is partly incrusting and partly sends off free 

 expansions. It measures 8 centims. by 4 centims. and is of a dull pale brown colour 

 and of a very brittle and light substance. 



Locality : Gulf of Manaar (growing over a colony of Lepralia gigas, Hincks). 



Retepora tubulata, Busk (1). 

 Locality : Gulf of Manaar. 



Retepora simplex, Busk (1). 

 Locality : Off Galle and onwards up west coast of Ceylon. 



Retepora apiculata, Busk (1). 

 Locality : Ceylon seas. 



Retepora pocillum, n. sp. Plate, fig. 16. 



These colonies correspond with Retepora avicularis, MacGillivray (23), in size, and 

 the zooecia in having triangular teeth within the orifice, and below this a loop-shaped 

 fissure, but there are some other additional marked characteristics in these specimens. 

 The zooecia are rhomboidal in form and have slightly tubular necks crowned by about 

 six spines, which are beautifully jointed in the Equisetum-like form described for 

 B. monilifera, MacGillivray (23). These are often broken, but their bases, which, 

 united, form the tubular neck, are visible, and when ooecia are present two are to be 

 seen in front of it, not always of the jointed form. The ooecia have a fissure faintly 

 visible. There is generally a small avicularium with a rounded mandible below the 

 orifice, more or less in the middle of the zooecium ; sometimes there are two of these, 

 one below the other, or rarely one large spear-shaped one, lying across the zooecium 

 and pointing upwards. 



Locality : Gulf of Manaar. 



Family : ADEONIDJi. 

 Adeonella subsulcata (Smitt, 26). 



The largest colonies of this species in the present collection are about 8 centims. in 

 height. They correspond entirely with Smitt's description, but that there is also a 

 serrated denticle within the orifice, corresponding to that of A. pectinata, Busk (1). 



Localities: Station I., off Negombo, Gulf of Manaar; Station XXIX., Trin- 

 comalee ; Station XLVL, off Mount Lavinia, 25 to 30 fathoms ; Station XL., 10 miles 

 off Watering Point, 34 fathoms ; and off Galle, deep water. 



