116 CEYLON PEAEL OYSTER REPORT. 



MacGillivray's figure (plate cxxxviii., fig. 5), from an upper angle of the zooecium ; 

 but are sometimes below the orifice, transversely placed, or they may be on separate, 

 raised areas. 



Localities : Gulf of Manaar ; and Navakaddu Paar. 



Schizoporella avicularis, n. sp. Plate, fig. 2. 



Zoarium adnate, of a pink colour ; zocecium punctured, with slightly raised margins. 

 Orifice with a broad sinus and umbo below it. Avicularia here and there large and 

 spatulate, starting from above the umbo, covering over the oral aperture and resting 

 on an extended portion of the zooecium above. Ocecia large, more finely punctured 

 than the zooecium and with a calcareous arch over its summit. 



Locality : Gulf of Manaar. 



I do not know of any species having an avicularium in the position described above. 

 When the mandible is removed, the zocecial orifice, with its operculum, appears beneath, 

 in its usual form. There is a specimen, in this collection too, of S. triangula, which 

 has apparently a similar arrangement of the avicularium and zocecial orifice, but it will 

 be necessary to examine more material before coming to a definite conclusion as to the 

 exact relations of these parts. 



Schizoporella collaris, n. sp. -Plate, fig. 4. 



Zoarium incrusting, of a dull white colour. Zocecia rhomboidal, punctured, the 

 upper portion slightly narrowed to a neck and bent forward. Orifice with a broad 

 shallow sinus, peristome thickened and forming a triangular bracket-like process in 

 front. Ocecia punctured like the zocecia, the sides extending to form with the 

 peristome a collar round the orifice. 



Locality : Station XL VI., oft* Mount Lavinia. 



Schizoporella pulcherrima (MacGillivray, 23). 



There is a strong resemblance between the " small colony," described by 

 MacGillivray, of this species and the large specimens from Ceylon, although the 

 former has no punctures on the zooecium, nor is it coloured, while the latter have 

 punctures as well as radiating lines and are coloured a deep red, excepting for one 

 colony, probably old, which is white. The raised margins of the broad zocecia, the 

 shallow sinus and avicularia on either side of the orifice are the same ; these are 

 sometimes quite up to the edge and in an angle of the zocecium. Ocecia, not described 

 before, are large, covering almost entirely the zooecium above and embedded in it, 

 punctured like the zocecium. The orifices of the zocecia which bear ocecia are larger 

 than those of the others. It is a very striking species. 



Localities : East Cheval Paar ; off Galle ; off Mount Lavinia. 



Schizoporella viridis, n. sp. Plate, fig. 3. 

 Zoarium incrusting and forming very large colonies, extending to nearly two feet 

 (50 centims. or upwards) across. 



