340 CEYLON PEARL OYSTER REPORT. 



Leptoclinum viride, n. sp. Plate VIII., figs. 28 to 33. 



Colony small encrusting masses (fig. 28) covering the stems of the large zoophyte 

 Campanulana juncea ; extent about 3 centims. x 2 centims. ; of a green colour 

 when alive, dull white when preserved. 



Test with the surface layer packed with small rounded cells containing green 

 granules (fig. 29) ; deeper layer (fig. 30) contains many stellate calcareous spicules. 



The surface of the colony is marked off into areas by branching grooves, along the 

 sides of which the ascidiozooids are arranged (fig. 28). The distribution of the 

 ascidiozooids and spicules, as seen in a surface section, is shown in fig. 33. The 

 spicules are placed most densely between the ascidiozooids, and only sparingly over 

 the surface in lines radiating from the branchial aperture. 



Fig. 31 shows one of the round cells containing green granules highly magnified, 

 and fig. 32 is one of the larger spicules to show the characteristically blunt points. 



Locality : Station XLIX., south of Periya Paar, 13 fathoms. 



Leptoclinum, spp. (?). 



In addition to the species of Leptoclinum described above, there are many smaller 

 colonies and fragments in the collection which seem too indeterminate and imperfect 

 to be identified. Some of them may be undescribed forms, but if so they are probably 

 poor specimens which possibly do not show well some characteristics of their species. 

 It may be worth while, however, to mention the localities of some of these colonies in 

 order to give a more correct impression of the abundance of the genus round the coast 

 of Ceylon. 



ON CHILAW PAAR : 



A smooth yellow-brown Leptoclinum. 



A snow-white solid species. 



An echinated form (Plate VIII. , figs. 41 and 42) with many cloacal apertures. 



Also an ordinary dull white form. 



ON CHEVAL PAAR : 



Small white colonies encrusting sponges. 

 A snow-white densely calcareous form. 

 Pieces of a brown Leptoclinum. 



ON NAVAKADDUA PAAR : 



Some small fragments of an ordinary white form in which the spicules are 

 spherical, with low flat knobs in place of projecting points. 



OFF NEGOMBO : 



Ordinary dull creamy- white colonies. 



