54 SI'OLIA ZEYLANIOA. 



kept for hours or overnight out of water in a cool place with impunity. 

 In the excellent wide-mouthed chatties which are made at Koddiyar, 

 they can be kept almost indefinitely in sea water renewed every 

 other day. There is, therefore, no difficulty to be met in regard to 

 the manipulation of the windoA^ -pane oysters. 



Explanation o^ the Plate. 



i'ig. 1. — A polygon cyst containing 14 endogens. Tamblegam, 

 Sta. IV., No. 11. 22-VI.-07. Diameter 0-32 mm. Zeiss 3C, cam. 

 luc* 



Fig. 2. — A pentagon cyst. The whole body is mobile indepen- 

 dently of the mobile endogens. Tamblegam, Sta. IV., No. 5. Most 

 of the calcareous concretions are omitted from the sketch. 



Fig. 3. — Another pentagon with crowded endogens. Sambore, 

 Sta. VIII. 14-VI.-07. 



Fig. 4. — A trigen cyst bearing a triplet of endogens. The latter 

 show stiff cilia pointing backwards. Tamblegam, Sta. VI., No. 10. 



Fig. 5. — A digen cyst. In front of the upper endogen in the figure 

 is seen the rostellum of the parent. From same host as fig. 3. 



Fig, 6. — Encysted larva containing a transparent homogeneous 

 endogen surrounded by a rim of the parent sarcode. All granules 

 seen are outside the endogen, and, upon focussing through it, there 

 appeared a continuous sheet of concretions on the other side. Zeiss 

 3D. Sambore, Sta. VIII., No. 2. r = rostellum of parent. 



Fig. 7. — Monogen from same host as preceding, containing a more 

 advanced endogen. Zeiss 3D. 



Fig. 8. — Young larva, 0* 12 mm. in longer diameter, from liver of 

 young placuna. Sambore, Sta, VII., No. 3. 



Fig. 9. — Encysted larva containing an endogen (e) with small 

 granules, surrounded by the large granules of the parent, r = 

 rostellum of parent. Sambore, Sta. VII., No. 2. 



Fig. 10. — A monogen from a Tamblegam placuna ; stiff cilia or 

 bristles are seen at the surface of the endogen. Zeiss 3D. 23- VI. -07. 



Fig. 11. — A microgen which may have arisen from an escaped 

 endogen since it contains both large and small granules. This 

 occurred in the same host as the macrogen shown in text figure 4, 

 and was lying close to it. Tamblegam, Sta. IV., No. 11. 



Appendix. 



Tables and diagram of curves illustrating the distribution of the 

 rainfall at Trincomalee from 1900 up to date, prepared by Mr. H. O. 

 Barnard, Superintendent of the Meteorological Branch. 



* The magnification is always the same except when otherwise 

 stated. 



