BIBLIOGRAPHY OF PALJEOZOIC CRUSTACEA. 61 



V. Asaphus Brong. Glabella well defined, clavate until it disappears; 

 the articulation of the tail is likewise distinct or indistinct until it disap- 

 pears completely. Thorax 8-jointed. 



VI. Illaenus Dalm. emend. Without glabella and without articulation 

 of the tail. Thorax (9) 10- jointed. Joints smooth. Eyes distant from 

 the axis of the head, located nearer to the margin. /. cassicanda, centrotus 

 and Bumastus barriensis. 



VII. B. Ogygia Brong. emend. Body 7 ? 8-jointed. 0. guettardi, 

 dfsmarestli, buchii, dilatata Brim. Asaphus tyrannus does not belong 

 here, but to Asaphus. 



VIII. Brontes Goldf. Caudal shield clypeoid, with radiating ribs. 

 Thorax 10-jointed. B . ftabellifer Goldf. 



IX. Nuttainia Eaton. Kibs of the tail distinct, connected only by their 

 margins, terminating in triangular points. Thorax 10-jointed. N. hiber- 

 n'lca. Port. 



Family III. Calymene. 



X. Encrinurus n. g. Possessing the power of contraction. Eyes 

 smooth. Glabella clavate. Pygidium with a many-jointed axis and few 

 ribs. Entomostracites punctatus Wahl. Amphion multisegmentatus and 

 Ofjygia rugosa Port. 



XI. Amphion Pander. Eyes smooth. Glabella of equal width, lobed. 

 Thorax many-jointed (20-jointed). Pygidium small and distinctly articu- 

 lated. A.frontilobus Pand. 



XII. Calymeue Brong. emend. With oculi hiantes. Glabella narrow- 

 ing anteriorly, lobed. Thorax 13-jointed. Pygidium articulated. Kibs 

 mostly furcated. C. blumembachii Brong. 



XIII. Homalonotus Konig (Trimerus Green). The same as XII, but 

 the glabella is not lobed. H. knightii Konig. Herschelii Murch., delphin- 

 ocephalus Green. 



B. Paradoxides. Not contractile. 



XIV. Conocephalus Zenk. Thorax 14-jointed. Eyes smooth. ? In 

 other respects like XI. C. sulzeri Schloth, strialus Emm. 



XV. Ellipsocephalus. E. hoffi, Schloth. 



XVI. Anthes Goldf. .4. scrabaeoides Wahl. 



XVII. Paradoxides Bron. emend. (Olenus Goldf.) P. gibbosus. 



Family IV. Odontpleura. Facial suture terminating at the posterior mar- 

 gin more or less distant from the angles of the head. Eyes smooth. Glabella 

 narrow anteriorly, divided into lobes at the sides. Margin of the head 

 lentated. Thorax 8-9-jointed, and upwards. Pygidium considerably 

 smaller than the head, with longer or shorter spiny appendages. The 

 pleurae of the thorax are likewise frequently elongated into spines. 

 Odontopleura n. g. Glabella semi-circular. Facial suture, see above. 

 1'yes smooth. Thorax 9- jointed. Pygidium furnished with a 2-jointed 

 axis, and dentated or spiny margin. O. bispinosa Emm., O.ovata Emm., 

 O. mutica Emm., O. cremata Emm., O. centrina Dalm., O. dentata Goldf. 



