204 CALIFORNIA ACADEMY OF SCIENCES. 



Sars (M.) Ueber einige neue oder unvollstandig 

 bekannte Trilobiten. 



Iii Isis (oder Eiicycl. Zeitung), Okeu, 1835, p. 333, pis. 8-9. 



Olenus forficula n.sp. Ampyx rostratus n. sp., A. mammillatus n. sp. 

 Asaphus dilatatus Dalm., A. grandis 11. sp. Calymene speciosa Dalm., C. 

 clavifrons Dalm. 



Angelin describes and illustrates Ampyx costatus Boeck, taking Sars' 

 figure of Ampyx mammillatus, 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 they resemble Sars' figure, pi. 8, fig. 4 b, 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 b 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 Ampyx 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, but they agree much better 

 than fig. 4 b. That both Boeck and Angeliu were correct in splitting up 

 Ampyx mammillatus Sars there can be no doubt; it is a question of the 

 correct separation. Ampyx costatus should not include the spined and 

 non-spined 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 Encycl. Zeitung, Okeii), 1835, p. 340, pi. 9. 



Asaphus expansus Limie, pi. 9, fig. 9., A. dilatatus Briinii, pi. 9, fig. 11. 

 Illcmus crassicauda Wahl., pi. 9, fig. 10. 



Sars describes the hypostomse of these species. The author remarks) 

 that the hypostomae may have surrounded the mouth and served as a 

 support for the mandibles. 



Scheuchzer (J. J.) Specimen lithologise Helvetia. 

 Zurich, 8vo, 1702. 



Meteorologia et Oryctographia Helvetica, oder 



Beschreibung der Lufftgeschichten, Steinen, Metallen, 

 etc. Zurich, 1718. 



The author classes the Trilobites with the Mollusca; 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. 



