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 Leaia. 



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



A. Subrectangular type: Leaia leidyi Jones. 



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

 wettinensis n. sp. 



Latreille (P. A.) Affinites des Trilobites. 



In Mem. Mus. Hist. Nat., Bruxelles, vol. 7, 1821, p. 22; Annals Sci. 

 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 pardoensis n sp. 



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

 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. kowalewslcii 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 a celle du Finistere. 



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

 Homalonotus barroisi n. sp., H. heberti n. sp. Ogygites armoriana Trom. 

 and Lebesc. 



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



Lehmann (J. G.) , Versuch einer Geschichte von 

 Flotzgebirgen betrefTend deren Entstehung, Lage, darin 

 befindlichen Metalle, Mineralien und Fossilien. Berlin, 

 1756. (*) 



