l8 THE HABITAT OF THE EURYPTERIDA 



A recent discovery by Professor Gilbert van In gen has brought 

 to light some eurypterid remains from a loose block found lying in 

 Oriskany Creek, 3 miles south of Clinton, New York. Three cara- 

 paces and several other fragments were found, the block also being 

 "full of lingulas and orbiculoideas" (39, 421). A new species, 

 Eusarcus vaningeni Clarke and Ruedemann was made, to include 

 these specimens which closely resemble E. cicerops of the Shawangunk 

 of Otisville and may represent the adult of that species. 



From the shale beds in the Shawangunk conglomerate at Otis- 

 ville, Orange County, New York, a large fauna of eurypterids has 

 been obtained, but other fossils except Ceratiocaris are absent. Here 

 in the Shawangunk Mountains of Eastern New York is a great series 

 630 feet thick of the Shawangunk grit resting upon the Hudson River 

 shales. The series consists of alternating shales varying from 2 to 

 6 inches in thickness, and conglomerates or sandstones from 1 to 50 

 feet thick, the shale bands containing the merostomes. Some of the 

 specimens though only 2.5 mm. long are perfectly preserved and are 

 by far the youngest and smallest yet recorded. In regard to the 

 occurrence Clarke says: "In the Shawangunk section we have a 

 fauna constantly repeating itself through a thickness of 650 feet 

 which elsewhere appears only and briefly at the base of the Salina" 

 (36, 303). The perfect specimens are all of young individuals, adults 

 being represented only by fragments. The species recorded are: 1. 

 Eurypterus maria Clarke, 2. Eusarcus? cicerops Clarke, 3. Dolichop- 

 terus otisius Clarke, 4. D. stylonurus Clarke and Ruedemann, 5. 

 Stylonurus (Ctenopterus) cestrotus Clarke, 6. S. (Ctenopierus) sp. a, 

 |8, 7, 7. 5. myops Clarke, 8. S. sp., 9. Hughmilleria shawangunk 

 Clarke, 10. Pterygotus globiceps CI. and R. 



From the middle part of the Shawangunk grit of Delaware Water 

 Gap, Pennsylvania, intercalated black shales similar to those in New 

 York have furnished eurypterids. These were discovered by Mr. 

 Paul Billingsley of Columbia University, who collected a large amount 

 of material and who reports that the fragments are all dissociated, 

 the carapaces commonly occurring by themselves, and separated from 

 the abdominal segments, as if arranged by violent currents. Pro- 

 fessor G. van Ingen and Mr. J. C. Martin have also collected exten- 

 sively from this section. From their large number of specimens 

 Clarke and Ruedemann have been able to identify Nos. 1, 3, 7, 9, 

 10 of the list of species recorded from the Shawangunk of Otisville, 

 and they make the comment that "Unfortunately, the maceration, 



