PLATE XIII. 
Dalmanites (Coronuka) aspectans. 
Page 33. 
Fig. 1. A fi-agment of the cephalon, showing the left cheek, the eye and a portion of the glabella. 
Corniferous limestone. Columbus, Ohio. 
Fig. 2. The left movable cheek, with the visual surface of the eye attached, showing the great elevation 
of this organ. This specimen is the original of Conrad’s description. 
Corniferous limestone. Near Schoharie, Schoharie county. 
Fig. 3. A similar si^ecimen, showing the eye. 
Fig. 4. A portion of the visual surface of the last specimen, enlarged to six diameters. 
Corniferous limestone. Schoharie, Schoharie county. 
Fig. 5. The pygidium of a small individual, showing the character of the surface ornamentation. The 
marginal spines and the posterior portion of the shield have been lost, and are restored in 
outline. 
Corniferous limestone. Golv/mhus, Ohio. 
Fig. 6. A small pygidium, showing pathological deformity. 
Cornifei'ous limestone. Columbus, Ohio. 
Fig. 7. A pygidium from which the surface and marginal ornamentation has been worn away. This 
is the specimen originally used in the description of Dalmanites Helena, Hall. 
Corniferous limestone. Colunibus, Ohio. 
Fig. 8. A pygidium of average size retaining the marginal spines. The drawing is made from a gutta¬ 
percha impression from a natural mould of the dorsal surface, and the tubercles of the sui-- 
face are obsolete. 
Corniferous limestone. Columbus, Ohio. 
Fig. 9. An entire pygidium, showing the normal length of the marginal spines. The surface oi'namenta- 
tion is obsolete. 
Corniferous limestone. Lime Rock, near LeRoy, Q-enesee county. 
Fig. 10. A large and somewhat imperfect pygidium, showing the chai-acteristic ornamentation of the crust. 
Corniferous limestone. Columbus, Ohio. 
Fig. 11. A large pygidium, retaining portions of the marginal spines, and scattered tubercles over the 
surface. 
Corniferous limestone. Columbus, Ohio. 
Fig. 13. A fragment showing the tei-ininal portion of a pygidium which is referred with some hesitation to 
this species. The surface ornamentation is similar to that in D. aspectans, and the marginal 
spines have been broken away, with the exception of the final pair which are unusually lai-ge. 
This form is believed to be identical with Mr. Conrad’s Asaphus ? denticulatus. 
Corniferous limestone. Schoharie, Schoharie county. 
Dalmanites (Coronuka) myrmecophorus. 
Page 37. 
See Plates 11 a, 14 and 15. 
Fig. 12. The x^ygidium of a small individual, which shows a certain degree of similarity with that of 
D. aspectans in the somewhat regular arrangement of the surface tubercles. The sxiecimen 
shows, however, the base of the strong terminal axial sxiine characteristic of D myrmecophorus. 
Corniferous limestone. Lime Rock, near LeRoy, Cfenesee couJity. 
