116 CEYLON PEARL OYSTER REPORT. 



Kebella calcarata (A. Agassiz) (9). 

 This species, previously known from Woods Holl, on the east coast of North 

 America, was found creeping over Sertularians from the Gulf of Manaar. 



Family: LAF<>EII>.E. 

 Lafoea serrata, Clarke (13). 

 A few colonies of this delicate little form were found creeping over Sertularians 

 from the Gulf of Manaar. Previously known from Cuba. 



Cuspidella costata, Hincks (15). 

 One or two broken fragments of this distinctive form were found creeping over 

 a Sertularian from the Gulf of Manaar. The species was previously known from 

 both sides of the North Atlantic Woods Holl and Britain. 



Family: SERTULARIIILF. 



Sertnlaria gracilis, Hassall Plate II., fig. 3. 



Our Ceylon specimens correspond with HlNCKs' (15) description of this form in all 

 its parts, but are much more attenuated than his figures represent, both in stem and 

 hydrotheca, so that they have quite a different appearance (see Plate II., fig. 3). 

 Many of the hydrothecse have reduplicated margins, which adds length to them ; also 

 in the preserved specimens the operculum often stands open and adds further to the 

 appearance of length. The species is known from both shores of the North Atlantic 

 (Britain and North America). 



Locality : Galle and onwards up the West Coast of Ceylon, deep water ; attached 

 to Algse, &c. 



Sertularia ligulata, n. sp. Plate II., figs. 1 to In. 



Trophosome. Colony about 1| inches in height in the largest specimens, with 

 simple or sparingly branched stems. Branches mostly given off from one side of the 

 stem, either two or three near together, or widely separated and few (Plate II., 

 fig. 1). They are narrowest at their junction with the stem below a pair of 

 hydrothecse, are smooth near the base, and have an oblique joint below their lowest 

 pair of hydrothecse (Plate II., fig. 1a). Both stem and branches usually end in 

 tendrils terminated by large flat disks which adhere to foreign objects (fig. 1a). 



Hydrothecse always in opposite pairs, one pair to an internode. They touch each 

 other for f of their length in front and are widely separated behind ; the free portion 

 is abruptly divergent, so as to leave a fold across the front of the cell ; orifice bilabiate. 



A good length of internode is seen below the hydrotheca?, and, usually, a joint just 

 above a pair of hydrothecse. A peculiar process like a little tongue or strap (hence 

 the name I give this species) protrudes from the orifice above the zooid, and is 

 sometimes contracted within the hydrotheca (fig. 1a). 



