60 CALIFORNIA ACADEMY OF SCIENCES. 



A. (Cr.) curactaci Murch., A. fimhriatun Murch., A.radiatus Murch., 

 A . lloydii Murch . 



IX. OdontocephaluK u. g. O. ovata n. sp. Calymejie arachnoidea Goldf. 

 CryphoEus Green. 



The author figures Phacops rotundi/rous, Conocephalus striatus, Odonto- 

 pleura ovata, CryptoUthiis caractaci and Asaphus gIohke.ps. 



Zur Naturgeschichte der Trilobiten. Pro- 



gramm zur offentlichen Priifung, welche mit den Zog- 

 lingen der Realschule in Meiningen Donnerstag dem 

 28, und Freitag den 29. Marz 1844 im grossen Horsaale 

 der Anstalt abgehalten werden soil, etc. Meiningen, 

 1844, 1 pi. 



Pt. 1. Zur Morphologic der Trilobiten, pp. 4-13. 



Pt. 2. Ueber die Trilobitengattimgeu, pp. 13-18. 



Pt. 3. Ueber die Verbreitung der Trilobiten in den Gebirgsschichteu, 

 pp. 18-28. 



The genera are arranged into 25 families in the following order: 



A — ^Phacops in the restricted sense (Calymene Broug. in part). Con- 

 tractile. Pleurte rounded at the extremity, with an acutely-sharpened 

 anterior margin. Axis of pygidium furnished with 11 or fewer joints. 

 P. macrophthalmus Brong., protuherans Dalm., cryptoj^hthalmus Emm. 

 (Calymene hevis Miinst.?), sclerops Dalm. (powisii Murch.), conophthalniun 

 Boeck., downingice. Murch., 2}rocevhts Emm., rotnndifrons Emm. 



B — Dalmania (Asaphus Brong. in part, Asaphus Goldf.) Not contractile. 

 Pleura at the anterior margin scarcely sharpened, frequently acute. Gla- 

 bella always clavate, distinctly lobed. Pygidium with more than 11, 

 sometimes as manj^ as 22, joints to the axis, frequently elongated at the 

 extremitj' of the tail. Phacops caudatus Brtinn., mucronatus Brong., 

 hausmanni Brong., odontocephalus Green., truncato-caudatus Port. 



II. Phillipsia Port. Facial sutiire extending to the posterior margin. 

 Glabella almost cylindrical. Thorax 9 to 10 jointed. 



(a) Nine-jointed species: Phacoj^s kelli, jonesii, ornata. 



(b) Ten-jointed species: Anajyhus dalmani Goldf. Calymene i.ffjualis 

 Y. Mey. 



Family II. Asaphi in the restricted sense. Contractile species. Pleur;© 

 always sharpened at the anterior margin, generally obtuse at the extremity. 



III. Griffithides Port. Glabella gibboiis, clavate. Thorax 9-jointed. 

 Pygidium furnished with 10 joints and upwards. G. glohiceps, longLspinus 

 Port., obsoletus Phil. 



IV. Gerastos Goldf. (Proetus Stein.) Glabella truncate, cylindrical, 

 indistinctly lobed. Thorax 10-jointed. Tail less and indistinctly jointed. 

 O. concinmis Dalm. 



