PLATE XI A. 
Dalmanites (Hausmannia) ]>leuuoptvx. 
Page 28. 
Fig-. 1. A cephalon of averag-e size, sho-wing the genei-al proportions, the crennlations on the frontal 
l)order and the i:)eculiar ornamentation of the cheeks. The left eye and a portion of the left 
cheek-spine are restored in the drawing. 
Lower Helderberg group. Near Clarksville, Albany county. 
Fig. 2. A cast of the under side of a pygidium regarded as belonging to this species. 
Oriskany sandstone. Cayuga, Province of Ontario. 
Fig. 3. A pygidium retaining most of the ci-ust, and showing the noi-mal characters of the species. 
Corniferous limestone. Lime Rock, Grenesee county. 
Dalmanites (Corycephalus) dentatus. 
Page 58. 
Fig. 4. A somewhat imperfect individual, but the most complete yet found, and the only one observed in 
which the parts of the body are i-etained in conjunction. 
Lowei- Helderberg group. Port Jervis, Orange county. 
Fig. 5. A cephalon, neai-ly entire, showing the characteristic marginal ornamentation. 
Lower Helderberg g-i-oup. Port Jervis, Orange corinty. 
Fig. 6. A pygidium, somewhat more Hattened than that in fig. 4; showing the character of the surface 
ornamentation and the bifurcate pleural annulations. 
Lower Heldei-berg gi-o«p. Port Jervis, Orange county. 
DAt.MANITES (CORONLRA?) EMAKGINATUS. 
Page 40. 
Fig. 7. A fragment of a pygidium, enlarged to two diameters, showing the broadly emarginate posterior 
extremity, and the bifurcate, regularly tubercled ribs. 
Schoharie grit. Schoharie, Schoharie county. 
Fig. 8. Another imperfect pygidium, natural size, showing similar characters. 
Schoharie grit. Schoharie, Schoharie county. 
These two are the only specimens of this species observed. 
Dalmanites (Hausmannia) concinnus. 
Page ao. 
Fig. 9. A small pygidium, enlarged to two diameters. 
Schoharie gi-it. Schoharie, Schoharie county. 
Fig. 10. A lai'ger pygidium, also enlarged to two diameters, showing the broad, flat annulations and the 
conspicuous posterior border. 
Fig. 11. A profile of the same, similarly enlarged. 
Schohaj-ie grit. Schoharie, Schoharie county. 
Dalmanites (Hausmannia) concinnus, var. serrula. 
Page 30. 
Fig. 12. A very small pygidium, enlarged to three diameters. The specimen, in addition to the normal 
characters of D. concinnus, has a row of spinules on the lateral margins. 
Upper Helderberg group. North Cayuga, Province of Ontario. ■ 
Dalmanites (Coronura) myrmecophorus. 
See Plates 13, 14, and 15. 
Fig. 13. A large glabella, referred with doubt to_this species. 
Cornifei-ous limestone. Schoharie {?), Schohanc county. 
