204 PROCEEDINGS OP THE GEOLOGICAL SOCIETY. [Jan. 10, 



Bavaria, and the State of Delaware. In the Skye variety, the 

 decalcified passages exhibit, in addition to the '^ white amorphous 

 masses," several thickish dendritic aggregations, composed of minute 

 granules, which agree in colour, and apparently in composition, with 

 the "chamber-casts"*. 



The passages in the Indian Ophite contain a few ill-defined 

 branching bodies of a somewhat crystalline appearance, along with a 

 large number of six-sided tabular crystals, apparently of chlorite, 

 which cross the passages in all directions f. 



The Donegal Ophite contains an abundance of crystalline aggre- 

 gations similarly situated — and, in addition, a number of plates, some 

 laminated, and others formed of intersecting crystals, which appear 

 to correspond to the Canadian and Connemara " amorphous masses "J. 



The Delaware Ophite is somewhat different, inasmuch as the 

 crystalline aggregations and amorphous masses are oftener closely 

 associated than usual; and the former are frequently masked with the 

 latter. The crystals of the aggregations sometimes assume a den- 

 dritic disposition; but they are more generally interlacing, and thus 

 form thickish reticulated plates. A number of associated passages are 

 occasionally nearly filled with amorphous (i. e. flocculent) matter, 

 broken up into parallel or divergent plates, with a loose texture §. 



In a variety of Ophite from Bavaria, a specimen of which has been 

 obligingly presented to us by Sir Charles Lyell, Bart., the decalcified 

 passages contain a large number of white crystalhne tufts, more or 

 less resembling those characterizing the Donegal and Connemara 

 rocks. They are unaccompanied, however, by crystals of mica, 



* In the Isle of Skye Ophite, the "chamber-casts," which affect a sort of 

 lamino-acerviiline arrangement, have the ordinary form and mode of attach- 

 ment, and consist of a dull-white or pale-green serpentine, or possibly pyro- 

 sclerite : they are small, and much crowded together, resembling in these 

 respects the granules in some of our Lisoughter specimens. The decalcified 

 passages, in addition to the "amorphous masses" and " dendritic aggregations " 

 noticed in the text, are filled with very minute filiform crystals, similar to those 

 occurring, as will be seen hereafter, under the same circumstances in Grenville 

 and Connemara Ophite. The "chamber-casts" are occasionally invested with 

 the " proper wall, which consists of both parallel and divergent aciculi. Hence 

 no doubt can be entertained as to the " eozoonal " character of the Isle of Skye 

 Ophite. 



t The "chamber-casts" of this variety are connected as ordinarily, and ar- 

 ranged acervulinely, but aggregated into various groups, differently coloured, 

 a group consisting of either green, blue, buff, or white granules of serpentine (?). 

 In some groups the granules are unusually small. The various colours give a 

 beautiful appearance to this Ophite. 



I The plates occasionally consist internally of serpentine, more or less split 

 up, and coated with white crystals. Way, the serpentine of the " chamber-casts" 

 may be seen similarly divided, also changing into a substance resembling that 

 of the " amorphous masses." 



§ The asbestiform investment, which the " chamber-casts " or granules of the 

 Delaware Ophite usually display, has already been noticed. The latter, com- 

 posed of a yellowish-coloured serpentine (?), are imbedded in saccharoidal 

 calcite. They are more irregularly shaped and of larger size than usual, often 

 completely separated and wide apart, frequently attached to one another by 

 long neck-like connecting pieces, and acervuline in their arrangement. We are 

 indebted to the Eev. Dr. Haughton for this variety, as well as that from India, 



