Pejs^ta. 



616 



Pentamerus comis. Atrypa comisj Owen, Geol. Wise.,. 

 fviii'c. jflBk ^ Iowa and Minn., 1852, plate 3 A, fig. 4; a 



smooth species from the limestone of the Up- 

 per Rapids of the Mississippi river. Devonian 

 age.— rilL 



Pentamerus elongatus. See Amphigenia elongata. 

 VIII a. 



Pentamerus fornicatus, Var. Hall. Trans Alb. Inst., 

 Vol. 10, 1879, Pal. N. Y., Vol. 2, pL 24, f. 7, in Ool- 

 lett's Indiana Report of 1881, page 299, plate 27^ 

 fig. 15, view of the only specimen observed, in the 

 Niagara formation ; closely resembling the P. 

 ^ornicatus^oiiliQ Clinton formation. — V a., Vh, 



Pentamerus galeatus, Dalman. {Atrypa galeata.) Hall^ 



VI fB 



25, 



plate 

 figure 

 [27, 1.] 

 V an- 

 uxem. 



page 



'^^^'<i^ldJi^'^^i^^ 217 f 



1. Rogers, page 825, 

 fig. 64:6, Lower Helderberg 

 formation. (Dalman, Vet. 

 Acad. Handlung, 1827.) 

 Fig. 454 in Geology of Can- 

 ada, 1863, gives a better 

 side view, and is therefore 

 inserted here. — In Penn- 

 sylvania it has been found 

 at Orbisonia, Huntingdon 

 Oo. Specimen 602-2 ; 605- 

 1 (interiors); on the Hog-back, Monroe Co. Spec. 608-8; be- 

 low Shawnee, 609-1 (two large blocks containing many indivi- 

 duals and three smaller blocks) ; at A. B. Miller's farm. Warrior 

 ridge, Barree township. Hunt. Co. Spec. 610-7 (two); all from 

 Lgwer Helderlerg limestone ( VI.) over the Waterlime,!!^^ 126» 

 Abundant in lower beds of F/. T, 41. — Spec. 702-16, is labelled 



