204 CALIFORNIA ACADEMY OF SCIENCES. 



Sars (M.) Ueber einige neue oder nnvoUstaudig 

 bekannte Trilobiten. 



lu Isis (Oder Eucycl. Zeituiig), Okeu, 1835, p. 333, pis. 8-9. 



Olenus forficula u.sp. Ampyx rostratus u. sjj., A. mammillcttus n. sp. 

 Asaphus dilatatus Dalm.., A. grandis n. sp. Calymene speciosa Dalm., C 

 clavi/rons Dalm. 



Angelin describes and illustrates Ampyx costatns Boeck, taking Sars' 

 figure of Ampyx mammillcttus, pi. 8, figs. 4 a-b and d, for the type of the 

 species. On comparing Angelin's illustrations of Ampyx costatus, pi. 40, 

 fig. 1, we observe that thej' resemble Sars' figure, pi. 8, fig. 4 h, in having 

 a produced glabella and spine. Sars' figures given on pi. 8, fig. 4 a, rep- 

 resent a species with a blunt glabella terminating in a tubercle; fig. 4 6 of 

 the same plate has an extended glabella prolonged into a spine. Both 

 these figures do not appear to be the same, therefore Angelin's description 

 of Ampyx costatus should be confined to Sars' fig. 4 b, and Ami>yx mam- 

 millatus should be restricted to Sars' figures of this species given on pi. 8, 

 figs. 4 a-c. 



These illustrations do not quite coincide, biit they agree much better 

 than fig. 4 b. That both Boeck and Angelin were correct in splitting u}} 

 Ampyx m,ammillatus Sars there can be no doubt; it is a question of the 

 correct separation. Ampyx costatus should not include the spiued and 

 non-spiued glabella represented on Sars' pi. 8, figs. 4 a-b, as Angelin has 

 reclassified it-. 



Bemerkungen iiber die untere seite von eini- 



gen Trilobiten. 



In Isis (Oder Eucycl. Zeitung, Oken), 1835, p. 340, pi. 9. 



Asaphus ex}Ki7isus Linne, pi. 9, fig. 9., A. dilatatus Brtinn, \A. 9, fig. 11. 

 Ilhenus crcossicauda Wahl., pi. 9, fig. 10. 



Sars describes the hypostoma? of these species. The author remarks 

 that the hypostomie may have surrounded the moi;th and served as a 

 support for the mandibles. 



Scheuchzer (J. J.) Specimen lithologise Helvetia. 

 Ziirich, 8vo, 1702. 



Meteorologia et Oryctographia Helvetica, oder 



Beschreibung der Lufftgeschichten, Steinen, Metallen, 

 etc. Ziirich, 1718. 



The author classes the Trilobites with the Molhisca; being only ac- 

 quainted with fragments or parts of the pygidium, he compares them with 

 Patella. 



Schlotheim (E. Fr. von.) Beschreibung einer seltenen 

 Trilobiten- Art. 



