BIBLIOGRAPHY OF PAL.EOZOIC CRUSTACEA. 61 



V. Atsaphus Broug. Glabella well defined, clavate uutil it disappears; 

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

 pears completely. Thorax 8- jointed. 



VI. Illaeuus 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. /. cnioiicanda, c/'ntroUm 

 and BumastuN barrieim-t. 



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

 desmarestii, buchii, dilatata Brim. Asaphus tyraiinus does not belong 

 here, but to Asaphus. 



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

 Thorax 10-joiuted. B.ftahcUifer Goldf. 



IX. Nuttaiuia Eaton. Ribs of the tail distinct, connected only by their 

 margins, terminating in ti-iangular points. Thorax 10-jointed. N. hiher- 

 nica 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. Entoviostracites punriatus Wahl. Amphlon midtkegmentatus and 

 Ogygia riigo-sn Port. 



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

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

 lated. A. fronldohus Pand. 



XII. Calymene Brong. emend. With ocufi hkuites. Glabella narrow- 

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

 mostly furcated, r'. hlumembachii Brong. 



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

 the glabella is not lobed. H.knightii Kiinig. Hersrhelii Murch., delphhi- 

 O'Ophalus Green. 



B. Paradoxides. Not contractile. 



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

 other respects like XI. C sulzeri Schloth, .strintu.f Emm. 



XV. Ellipsocephalus. B. hoffi Schloth. 



XVI. Anthes Goldf. A. scrabaeoides Wahl. 



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



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 

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

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

 {•leura? of the thorax are likewise frequently elongated into spines. 

 < )dontopleura n. g. Glabella semi-circular. Facial suture, see above. 

 i;;yes smooth. Thorax 9-jointed. Pygidium furnished with a 2-jointed 

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

 <>. mutica Emm., O.cremaia Emm., O.rvntruin Dalm., O.deittala Goldf. 



