460 PROCEEDINGS OP THE NEW YORK MEETING 



often resemble those of Triplegia exlans, a, fossil vviiicli is frequent in a correspond- 

 ing position above layers containing Paradroplila hemipHmln in central New York,* 

 but whicli has not been found in the lake Chaniplain valley. Associated in the 

 Parasirophia hemiplicala bed is what appears to be an undescribed variety of Dal- 

 mavella, of large size and marked by very strong plications. Still another new form 

 of Dalmanella occurs higher in the series, and also a species which is perhaps identi- 

 cal with Dalmanella delicahila of Billings. 



Murchisonia bellicincta appears in the tabulation prevailingly in the lower Trenton, 

 associated with Proiowarihia cancellata, Liospira americana, Subulites elongaius, Bel- 

 hrephon capex, Whitella ventricosa, Ctenodontn levata, and C. dubia, Dinorthis pectinella, 

 Ilormotoma gracilis, and numerous trilobites, such as Illseims americanus, Ceraurus 

 pleurexantheynus, Bathyiirus sp. , etcetera. 



By coincidence two species laid aside as new in the preliminary field study very 

 shortly afterward appeared in volume iii of the Paleontology of Minnesota. These 

 are Plerygometopus eboraceus of Clarke, described from Rawlins Mills, New York, 

 and found on lake Champlain, at Larrabee point at about 90 feet and on Crown 

 point at about 80 feet above the base of the respective sections. Another Plen/- 

 gometojms, probably intermedins, also occurs in neighboring layers. The other newly 

 recognized species is Schizambon dodgei, which Winchell and Schuchert describe 

 from the dark, compact limestone near the top of the Trenton, at Sandy Hill, New 

 Y^ork, and which occurs, lower in the series, at Larrabee point. 



The most notable fossil assemblage in the upper portion of the section is that of 

 Lingida vanhorni, and L. sequalis, Orbieidoidea lamellosa, Trematis terminalis, various 

 graptolites (seldom well preserved), Leptobolus inslgnis, Ctenodonta dubia, Conularia 

 trentonensis, and Holopea paludiniformis. 



The shaly masses toward the top of the Trenton abound in masses of Muniicidi- 

 poridse. 



The most interesting fauna of all, however, is that of the very high Trenton or 

 Utica of Cumbei'land head, which establishes a connection between the faunas 

 of New York and Canada. Here we find associated Leptobohis iyisignis, Lingida 

 sequalis, L. curia and L. riciniformis of the New York Trenton, with L. cobourgensis ' 

 and L. progne (at Crown point), both being Canadian species of Billings, together 

 with a new species, resembling L. tvhitfieldi of Ulrich. Zugospira exigua and Z. 

 recurvirostris, Trematis terminalis, Scklzocrania filosa, Rafinesquina allernala, Cienodonla 

 gibbosa and C. levata, Calymmene senaria, Isotelus gigas, Ceraurus pleurexantJiemus, 

 Trinucleus concentricus, and Odontopleura parvula, all of which are New York, and 

 most of them also Illinois and Minnesota forms,, are associated with Trematis oila- 

 wensis, Illxnus americanus, and Turrilejns canadensis, all of Canada, the latter previ- 

 ously reported from the lower Utica formation, near Ottawa, with many of the same 

 associates, t The lower portion of the series, which is so largely developed on Gum- 

 berland head, contains in all localities a fauna of numerous very small individuals 

 of Ceraurus 'j^leurexanthemus aud Triarthrus becJci, the latter, on account of their small 

 size, resembling T. fisheri of Billings, but whiel; do not show the series of minute 

 but distinct i^its along the front margin of the cephalon which occur in that species. 

 HallJ notes Phacops callicephalus and Ceraurus pleurexanthemus in Wisconsin occur- 



* T. G. White : Ann. Rept. Director New York State Mus., 1809, Appendix A, pr. 28. 

 tH. Woodward : Geol. Blagazine, pi. iii, vol. vi, 1889, pp. 271-275 ; and H. M. Ami : Ibid., October, 

 1888. 

 I. J. Hallj:iFoster andJWhitney's Rept.,;vol. ii, 1851, p. 212. 



