316 Magnetic Declination and Horizontal Force. [Apr. 1, 



jolatyceps. Portions of a cranium and mandible are referred to a 

 Meiolania minor. Both species, as in Megalania, are edentulous with 

 modifications of the mouth indicative of a horny beak, as in the 

 Chelonian order. The cranial and vertebral characters are, however, 

 sauroid. Horn-cores in three pairs are present but shorter relatively, 

 especially the first and third pairs, than in Megalania prisca. The 

 indication of a seventh more advanced and medial horn is feeble, and 

 the author remarks that in the small existing lizard (Moloch) this 

 horn has not an osseous support. The tail of Meiolania is long and 

 stiff ; the vertebrae being encased by an osseous sheath, developing, as 

 in Megalania, tuberous processes in two pairs, corresponding with the 

 vertebrae within : such defensive parts are less developed, relatively, 

 than in Megalania prisca. 



The locality of these singular remains is an insular tract not 

 exceeding 6 miles by 1 mile in extent ; situated mid-way between 

 Sydney and Norfolk Island, in lat. 31° 31' S., long. 159° 9' E. 

 The island is formed of three raised basaltic masses connected by 

 low-lying grounds of blown coral-sand formation, consisting of 

 rounded grains and fragments of corals and shells. In the parts of 

 this formation converted into rock were found the petrified remains 

 which are the subject of the present paper. It is accompanied by 

 drawings of the most instructive fossils : these form the subjects of 

 five plates illustrative of the text. 



III. 44 On the Lnni-Solar Variations of Magnetic Declination and 

 Horizontal Force at Bombay, and of Declination at Trevan- 

 drnm." By Charles Chambers, F.R.S., Superintendent of 

 the Colaba Observatory, Bombay. Received March 24, 

 1886. 



(Abstract.) 



The materials described in this paper are twenty-five years of 

 declination observations, and twenty-six and a half years of horizontal 

 force observations, taken at the Colaba Observatory, Bombay, and 

 some results of ten years declination observations taken at the 

 Trevandrum Observatory. A consideration of the lunar diurnal 

 variations derived from these observations for different seasons and 

 phases of the moon, leads the author to form the hypothesis that 

 these variations are, properly speaking, combinations of solar diurnal 

 variations that run through a cycle of change in a lunation. The 

 characteristics of the variations that give rise to the hypothesis are 

 (1) that generally the great movements occur in them, as in the mean 

 solar diurnal variations for full lunations, in the solar day hours, 

 whilst the night hours are relatively quiescent ; and (2) that they 



