52 SAN DIEGO SOCIETY OF NATURAL HISTORY 
Lapworth (Charles). On the discovery of the Olenellus fauna im 
the Lower Cambrian Rocks of Britain. 
Geol. Mag. Dec. 3, vol. 5, 1888, p. 484; also p.190, vol. 6, 1889. 
The author remarks: “The remarkable fauna of the Olenellus or lowest Cambrian 
zone originally discovered in America by Dr. Emmons in 1844 (the Taconic system 
based on observations in New York, Massachusetts, Maine, Vermont and Rhode 
Island, Albany, 1844, p. 21, Elliptocephala asaphoides,) was first recognized in Europe 
by the late Dr. Linnarsson in 1871 (Ofversigt af Kongl. Vetenskaps Akad. Forhandl, 
No. 3, p. 790, Paradoxides Kjerulfit), in the basal zones of the Cambrian near Lake 
Mosen in Norway, but its typical genus Olenelius was then referred by him to the | 
allied but more recent genus Paradoxides. 
This reference was corrected by Prof. Brogger in 1875 (Geol. Férening Stockholm 
Forhandl., vol. 2, 1875, p. 573), and the various brilliant papers on the primoidilal 
formations by this author have given the Olenellus fauna a marked and peculiar in- 
terest. 
In 1882 Linnarsson next made known the existence of the Olenellus fauna in Scania 
at the base of the Swedish Cambrian. In 1886 the same fauna was detected by 
Mickwitz in the Lower Cambrian of Russia (Esthonia) and this Russian fauna has 
been lately figured and described by Dr. Schmidt. Dr. Holm has signalized the ex- 
istence of the Olenellus fauna in the Cambrian of Lapland, where it was detected by 
Morstell in, 1885. 
The original discovery of the Olenellus zone in Europe was made by Dr. A. G. 
Nathorst in 1868. This species, Olenellus Kyerulfi, was named Paradoxides HW ahlen- 
bergi, Torell Petrefacta Suecana from Cambrica, 1869-70, p. 4, but he did not describe 
or figure the new form; therefore, O. Kjerulf must be retained for the name of the 
species. 
Laurie (M.) The Embryology of the Scorpion. 
Micr. Sci. Quart. Jour. ser., vol. 31, 1890, pt. 2, p. 105. 
Euscorpitus italicus. 
On some Eurypterid remains from the Silurian Rocks of Pent- 
land Tills. 
Trans. Roy. Soc. Edinb., vol. 37, 1892, p. 151. 
Stylonurus ornatus nov., S. macrophthalmus nov. Eurypterus Scorpiodes Woodw., E. 
conicus nov., E. cyclophthalmus nov. Drepanopterus pentlandicus. 
Recent additions to our knowledge of Kurypterida. 
Nat. Sci., vol. 3, 1893, p. 124. 
The Anatomy and Relations of the Eurypteridae. 
Trans. Roy. Soc. Edinb., vol. 37, 1893, p. 509. 
On some Eurypterid remains from Upper Silurian Rocks of — 
the Pentland Hills. 
This author has described in a paper before the British Association, 1892, p. 729, and 
the Royal Society of Edinburgh between the years 1892 and 1899, Trans, Roy. Soe. 
Edinb., vol. 38, pt. 1, p. 151, 1893, and vol. 39, 1890, p. 575, four new species to the 
genus Eurypterus, three to Stylonurus, and makes a new species of Silmonia. He is 
compelled to make two new genera to receive some more generalized forms. One of 
these, Drepanopterus, comprising three species, combines characters found in Stylonurus 
and Eurypterus; and for one species with very generalized characters he makes the 
genus Bembicosoma. 
