204 CALIFORNIA ACADEMY OF SCIENCES. 



Sars (M.) Ueber einige neue oder iinvollstandig 

 bekannte Trilobiten. 



lu Isis (Oder Eucycl. Zeitung), Oken, 1835, p. 333, pis. 8-9. 



9lenus forficula u.sp. Ampyx rostratus u. sp., A . mammillatus n. sp. 

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

 clavifrons Dalm. 



Angelin describes and illustrates Ampyx costatus Boeck, taking Sars' 

 tignre of Ampjyx 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, 

 tig. 1, we observe that they resemble Sars' figure, pi. 8, fig. 4 b, in having 

 a produced glabella and spine. Sars' figures given ou 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 app'^ar to be the same, therefore Angelin's description 

 of Am]>yx costatus shoiild be confined to Sars' fig. 4 b, and Ampyx mam- 

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

 figs. 4 a-c. 



These illustrations do not quite coincide, but thej- agree much better 

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

 ^mpyx 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. 



Beinerkuneeii iiber die untere seite von eini- 



gen Trilobiten. 



In Isis (oder Encycl. Zeitung, Oken), 1835, p. 340, pi. 9. 



Asaphus expansus Linne, -pi. 9, fig. 9., A. dilatatus Brunn, pi. 9, fig. 11. 

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



Sars describes the hypostomae 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, Steiuen, Metallen, 

 etc. Zurich, 1718. 



The author classes the Trilobites with the MoUusca; 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. 



