OF THE SPECIES. 107 



2. As. palpebrosiis : \'crticc tumido, uiargiuem crassum scuti ccphalici superantc ; oculis longis- 

 simis. Long. IK-li'i ". 



Dalm. Falaad. 48. 9, Tab. IV, Fig. 1, a-c. Emmr. Dimcrt. 32. 14. Milne Edw. 

 Crust, iii, 299. 4. Hising. Ldh. Sure. 1.5, Tab. Ill, Fig. l.ajj. 

 Localily. — The transition limestone of Eastgothland, at Husbyfjül. Having had no oppor- 

 tunity of examining a specimen of this or the following species, I must refer the reader to 

 Dalman's detailed description. 



3. As. l<Bviceps : Scuto capitis caudreque in marginc dilatato, acutangulo, axin siiperante ; oculis 

 brevioribus. Long. 2". 



Dalm. Fa/aad. 47. 8, Tab. I, Fig. 1, a-d. Emmr. Bissai. 32. 13. Milne Edw. 



Cn/st iii, 305. 5. Rising. Lef/i. Suee. Tab. II, Fig, 8, a, b. 

 Loeality. — The transition limestone of Eastgothland, at Husbyfjöl ; but, like the pre- 

 ceding species, of rare occurrence. 



h b. — The glabella and tbe caudal axis project distinctly as defined and convex portions, circum- 

 scribed by sulcations ; the latter is also articulated. The eyes are elevated, but short 

 protuberances, which reach only at the posterior part to the fiuTow at the maxillary shield. 

 The angles of the cephalic shield are rounded. The axis of the body is narrower than the 

 lateral lobes, and the latter have distinct diagonal fiu'rows. Hemicrypturus, Green, Cryp- 

 tonynnis, Goldf. Eichw.* 



4. A. exjwnsus : Protuberantia verticis postice coarctata, utrinque juxta spiram articulatoriam 

 nodosa ; angulis scuti cephalici caudseque obtusis. Long 3-3 ". Tab. V, Fig. 1, a, c. 



Eef. — Entomol. paradoxus a, crpansus, Linn. 8. Nat. iii, 160. It. vel. 147. e. Fig. 

 RoBERG, Dissert, de Jstac. pp. 19, 20. Klein, Spec. Petr. Gedan, Tab. XV, 

 Figs. 3, 4. ScHLOTH. Leonliard's Taschenb. 1810. 1. Tab. I, Figs. 1, 3. Razou- 

 MOWSKY, Annal. de Scienc. Nat. tom. viii, PI. XXVIII, Figs. 2, 3, 5, 6, 7. Entomostr. 

 expans. Wahlenberg, N. A. Ujjs. viii. 25. I. Asapih. expans. Dalm. Palcead. 45. 6, 

 Tab. Ill, Fig. 3, a, d. Klod, Verstein. der Mark Brandeni). 108. Bronn, Letli i, 

 114. 1, Tab. IX, Fig. 7. Emmr. Dissert. 30. 10. Hising. Leth. Suec. Tab. II, 

 Fig. 6. L. V. Buch, Beitr. 41. 



Asaph. corni(/erus, Brongn. Cr.foss. 18, PI. II, Fig. 1, a,b; PI. IV, Fig. 10. Pander. 

 Beitr. 135, Tab. VI, Figs. 1, 4, 7 ; Tab. VII, Figs. 3, 4; Tab. VIII, Figs. 2-6. 



Trilob. cornif/er. Schloth. Petref. 38. 1, NacJdr. vi, 16. 34. Trilob. Schroeteri, ibid. 

 35. 10, Tab. II, Fig. 3 (large caudal shield). 



Cryptonymus Lichtensteinii, EiCHW. 47, § 53, Tab. II, Fig. 3, a, b. Cr. Panderi, ibid. 47. 

 § 52, Tab. Ill, Fig. 1, a, b. Cr. Schlotheimii, ibid. 45, Tab. IV, Fig. 2, «, b. Isoteles 

 expans. Milne Edw. Crust.'m, 304. 12. Isot. Lichtensteinii, ibid. 303. 11, Hemi- 

 crypturus Basoumowskii, Green, Mon. of Trilob. 20. 



Locality. — The transition limestone of Sweden, at Husbyfjöl, and Oeland ; in Esthonia, 

 at Revel and Petersbui-gh ; in Norway, at Christiania ; in boulders in Northern Germany. 

 Wilken's figure in the Stralsund Mag. (I, Tab. II, Fig. 5, Tab. Ill, Fig. II) seems to belong to 

 this species. 



Cephalic shield at the posterior part tw ice as broad as long, the entire external margin 



