412 Beecher and Clarke — Lower Oriskany 



Tkilobites. (H) 4. Dalmanites sp. n. A. A large Odoatochile with a series of 

 marginal crenulatious about the cephalon. of the character of those in D. pileurop- 

 tyx of the Shaly limestoDe and D. anchiops, of the Schoharie grit, but more 

 extensive than either. The lateral glabellar lobes are more confluent than in 

 the earlier (Xiagara and Lower Helderberg) species. The genal angles end 

 obtusely or in small spines. The pygidium is broad and unusually short, ending 

 in a sharp, angular termination, but not in a spine. Annulations simple and very 

 distinct ; about 10 on the axis and 9 on the pleura?. This is the largest and most 

 abundant of the species. Some of the cephala measure 3£ inches in diameter. 



(H) 5. Dalmanites sp. n. A. var. This is represented by a series of pygidia 

 similar in an nidation to the foregoing but persistently different in much smaller 

 size, more slender form and tapering outline. It is closely similar to D. micrurus, 

 of the Lower Helderberg, but less abundantly annulated. 



6. Dalmanites sp. n. B. Long, slender pygidia with acute but not extended 

 terminal spine. Annulations of axis about 15 ; of pleura?, 12. On the axis is a 

 double median row of conspicuous tubercles and there are irregularly scattered 

 tubercles on the pleural' ribs. This may be compared in form and ornament with 

 D. dentatus, of the Port Jervis series, but it is more abundantly annulated and 

 without the strong caudal spine of that species. 



7. Dalmanites sp. n. C. A single pygidium, quite distinct from the rest, has a 

 tapering outline, high convexity, broad, acute caudal extremity and strong simple 

 annulations. There are 7-8 annulations on the axis, 8-9 on the pleura, all termi- 

 nating at a considerable distance from the extremity of the shield. The expres- 

 sion of this pygidium is well defined and suggests in some respects, that of a 

 small, sharply annulated Homalonotus. 



(H) 8. Dalmanites sp. ? D. There is evidence of another species of this genus 

 with a pygidium somewhat similar to that of D. pleuroptyx. 



(D) 9. Dalmanites pliacoptyx, Hall. This species has heretofore been known 

 only in the Upper Helderberg limestone of the Province of Ontario. 



(H, D) 10. Phacops sp. n. Heads and pygidia are not uncommon. The 

 form of the glabella is somewhat appressed laterally and is suggestive of P. cepha- 

 lotes Barr. The genal extremities bear a single spinule or tubercle as in P. Logani, 

 of the Shaly limestone, and P. pipa, of the Upper Helderberg, but the glabella 

 does not show the lateral furrows distinctive of the earlier species of this genus. 

 The segments of the thorax bear nodes at the axial furrows, such as characterize 

 P. Logani, though the annulations of the pygidium do not appear to be duplicate 

 as in the Lower and Upper Helderberg species. Some small examples do not 

 have the thoracic nodes and these may represent a distinct specific form. 



(D) 11. Phacops (Acaste) cf. anceps, Clarke. This species has heretofore been 

 found only in the Upper Helderberg of the Province of Ontario. 



(D) 12. Homalonotus sp. Occasional fragments indicate a species of small 

 size, differing from the gigantic H. major, occurring in the Oriskany sandstone of 

 Ulster Co. 



(H) 13. Cordania* sp. n. Allied to C. cyclurus, Hall, of the Shaly limestone 

 but differing in details of ornamentation. 



(H, D) 14. Cypliaspis sp. n. Of the type of C. caileos (Lower Helderberg) and 

 C. minuscula (Upper Helderberg) but with proportionately much larger cephalon. 



(D) 15. Proetus sp. n. ? A. A small form of the P. angustifrons-clarus-Rowi 

 type. 



(D) 16. Proetus sp. n. B. A much larger form with highly convex glabella and 

 multiannulate pygidium ; of the type of P. crassimarginatus of the Upper Helder- 

 berg. 



(H) 17. Acidaspis tuberculatus, Conrad. A characteristic species of the Shaly 

 limestone. 



Osteacodes. 18. Leperdilia sp. 19. Primitia sp. 



Cirripedes. 20. Turrilepas pp. 



(Cephalopods. No representative of these fossils has been observed.) 



Gastropods. 21. Platyceras tortuosum, Hall. 22. P. nodosum, Conrad. 

 23. Strophostylus expansus, Conrad. 24. Diaphorostoma ventricosum, Conrad. 



*The writer has introduced this name in a paper now in press, for certain 

 American species which have been referred to the genus Phaethonides, Angelin. 



