478 Revieics — Anahjsin of a Peruvian Lake. 



to three new genera, and to note their points of structural and 

 phylogenetic interest. Two of the specimens came from the Lower 

 Greeusand of Woburn Sands, Bedfordsliire, the third from the same 

 formation of probably Luccomb Chine, Isle of Wight ; and they are 

 referred to three new genera and species, Aptiana radiata, Wohurnia 

 porosa, and Sahidia scottii. These woods show no resemblance to 

 any group of the Gymnosperms, but appear to be like highly-placed 

 Angiosperms ; however, no very definite statement can be made as to 

 their affinities, so Dr. Stopes refrains from entering into an elaborate 

 discussion on their bearing on the origin of the Angiosperms. 

 Hitherto it was thought that the Angiosperms in Lower Cretaceous 

 times had not spread eastward farther than Portugal, and the chief 

 interest in the present specimens is their occurrence in Northern 

 Europe in Aptian times. 



VI. — Analysis of a Peruvian Lake. 



Lake Paeinacochas. — Particulars of the composition of the water 

 of this lake have been published by Messrs. G. S. Jamieson and 

 Hiram Bingham [Amer. Journ. Set., July, 1912, p. 12). Lake 

 Parinacochas is situated in Peru, between 15° and 16° S. latitude 

 and 73° and 74° longitude W. of Greenwich. It is about 150 miles 

 north-west of Arequipa, and about 170 miles scuth-west of Cuzco. 

 It is fed by small streams, and when visited in 1911 it had no visible 

 outlet. Its elevation is about 11,500 feet above sea-level ; its length 

 was about 18 miles, the width 7 miles, and the depth almost 

 uniformly 4-2" feet in November, 1911. The composition of the water 

 in milligrams per litre is stated as follows : — 

 Sodium chloride 



12,059-0 



The salinity is about one-third that of the Atlantic Ocean, and about 

 one-twentieth that of the Great Salt Lake, 



VII. — Lower Huronian Fossils. 



Canadian Fossils. — Some fossils from the Steeprock Series (Lower 

 Huronian) of Steeprock Lake, north-west of Atikokan, Ontario, 

 liave been studied by Dr. Charles D. Walcott, who considers them to 

 be forms related to the Porifera and possessing characters also of the 

 Archseocyathinte. On this new material tlie genus Atikokania is 

 founded, and two species, lawsoni (the genotype) and irregularis, are 

 described. The central cavity and radiating tubes of A. lawsoni 

 resemble Griffitli Taylor's genus Syringocnema, and the tube walls 



