I.Introduction. Prof. A. Lacroix has recorded the existence of wollastonite- and scapolite-bearing rocks in Ceylon. The specimens examined by him can hardly, however, have come from Galle, as they contain garnet, a mineral never found in the rocks of the Galle Group described below. It seems therefore probable that rocks allied to those of Galle, but differing from them in petrological details, will be found elsewhere in Ceylon. I have on a former occasion given a short description of the Galle rocks, and am now able to supply a more detailed account of the rocks and to describe their field-relations. There are excellent exposures at Galle, within the Fort on the western side, between the Signal flagstaff and the north-western bastion ; outside the Fort below the north-western bastion ; and south-west of the Victoria Park near the remains of an old powder-magazine. All these exposures can be easily visited in the course of one whole day spent at Galle. II. General Description. The Galle rocks differ from normal types belonging to the Charnockite Series in the following ways :— (1) The presence of wollastonite, scapolite, and sphene. (2) The existence of definite dykes and segregation-veins crossing the foliation. (3) The absence of garnet, hypersthene, mica, and original hornblende, and bands of ‘granular quartz-rock’. (4) Somewhat coarser grain. But resemble them closely in (5) The variability of chemical and mineralogical composition.