57 



Atry. 



Atrypa lingui-fera. See Atrypa naviformis. V a, 

 Atry pa medialis. See Eatonia medialis. VI. 

 Atrypa mesacostalis. Leiorhyncus mesacostalis. VIII g, 

 Atrypa nana. See Rhynchonella recinula. XI 



Atrypa naviformis. {Pentamerus linguiferus\ see English 

 V* j^^^ ^^^^ Atrypa Unguifera; Sowerby, in Siluria, 



pi. XX, fig. 21, 1859; Silur. Research, 

 pi. XIII, fig. leS.) Hall, page 71, fig. 16, 

 3. A nearly globular shell confined 1o 

 j/^^^^^^F" 3."^^^ the Clinton Upper limestone. Va. 



Atrypa neglecta. 00, 506-9; Bell's Mills, Blair Co., Pa., 

 from Clinton lime shale.^ Va. 



Atrypa nitida. See Meristina nitida. Vh. 

 Atrypa peculiaris. See Eatonia peculiaris. VII. 

 Atrypa plena. See Rhynconella plena. II a, II h. 

 Atrypa plicatula. See Rhynchonella plicatula. Va. 

 Atrypa plicifera. See Rhynchonella plicifera. II a. 

 Atrypa polita. See Athyris polita. VIII g. 

 Atrypa prisca. See Atrypa reticularis. Va to VIII g. 

 Atrypa quadricostata. E,hynchonella quadric. VIII e. 



Atrypa pseudomarginalis. — Specimen 856-16 (dorsal 

 valve); Mixtown, Tioga Co , Upper Chemung VIII g. 



Atrypa reticularis. ( A trypa aMnis.) Hall , page 72, figs. 



17, 8, 8c^, old 



and young 



spe c i m e n s . 



Y\ Sd^ (Yanuxem, 



in ^^rpiix^- page 88, fig. 12.) Rog- 

 1/ -444M^ o^^g^ p^g^ g23, fig. 633. 



Ya., Clinton formation. Specimens in the 

 Cabinet; 00, Pal. Coll. p. 233, spec. 503- 

 3, much crushed ; 503-6, poor ; 503-8, poor : by Hale & Hall, 

 at Matilda furnace, Mifflin Co., from Clinton shale, Va. — 506-1 ; 

 506-2; 506-1; 506-19; 50n-20 ; 506-23; 506-24 ; 506-25 ; 506- 

 26; 506-27; 506-31; 506-33; 506-34; by C. E. Hall, 2m. S. 

 W. of Bell's Mills, Blair Co., from Clinton lime shales^ Va. — 

 507-2; 507-3; 507-6; 507-9, poor impression of a fragment; 

 507-11, dorsal valve; 507-15; by Fellows & Hall, at Matilda 



