132 CALIFORNIA ACADEMY OF SCIENCES. 



The Olenellus zone in North West Europe. 



In Geological Mag., new series, decade 3, vol. 6, 1889, p. 190. 



On Olenellus callavei and its Geological rela- 

 tions. 



In Geological Mag., December number, 1890. 



Laspeyres (H.) Das fossile Phyllopoden-Genus Xeaia. 



In Zeitscbr. Deutsch. geol. Gesell., Berlin, 1870, p. 733, 1 pi. 



A. Subrectangular type: Leaia leidyi Jones. 



B. Suboval types: Leaia salteriana Jones, L. haentschiana Beyr., L. 

 icettinensis n. sp. 



Latreille (P. A.) Affinites des Trilobites. 



In Mem. Mus. Hist. Nat., Briixelles, vol. 7, 1821, p. 22; Annals Soi. 

 Phys., Bruxelles, vol. 6. 



The author endeavors to prove by the absence of feet and other charac- 

 teristics, that the Trilobites are nearly related to the genus Chiton. 



La Touche (J. D.) Guide Book to the Geology of 

 Shropshire. London, 1884.'^ 



Ceratiocaris pardoeiisis n sp. 



Lawrow (N.) Zwei Neue Asaphus-Arten aus deni 

 silurischen Kalksteine. 



In Verhandl. russ. k. mineral. Gesell. zu St. Petersburg, 1855-56, p. 

 237, pis. 4, 5. St. Petersburg, 1856. 



Asaphus delphinus n. sp., A. hoioalewshii n. sp. 



Ptychopyge und Megalaspis, Trilobiten der 



unter-silurischen Kalksteine. 



In Verhandl. russ. k. mineral, zu St. Petersburg, 1857-58, p. 146, plate. 

 St. Petersburg, 1858. 



The author gives typical illustrations of these genera. 



Lebesconte (M. P.) Constitution generale du massif 

 breton comparee k celle du Finist^re. 



In Bull. Soc. Geol. France, 3d series, vol. 14, 1886, p. 776, pis. .34-36. 

 Homalonotus barroisi n. sp., H. heberii n. sp. Ocjygites armoriana Trom. 

 and Lebesc. 



See also Tromelin (Gaston de) and Lebesconte (M. P.) 



Lehmann (J. G.) Versuch einer Geschichte von 

 Flotzgebirgen betreffend deren Entstehung, Lage, darin 

 befindlichen Metalle, Mineralien und Fossilien. Berlin^ 

 1756. C") 



