4S AsAP. 



and Minnesota, 1852, pi. 2, fig. 3, 4, 5 ; pi. 2 A, fig. 1, (2) 3, (4) 

 5, 6, 7 ; head and tail pieces, and one of the elevated conical 

 compound eyes of the trilobite. Trenton strata of Iowa. — lie. 

 Note, the medal ruling gives fine relief and general effect, but 

 not definite details of structure. 



Asaphus limuluTus. See Dalmanites limulurus. Yh. 



Asaphus longicordatus. See Dalmanites limulurus. Vh. 



Asaphus marginalis. (Hall, Pal. N. Y. Vol. 1, 1847. 

 ^^>^^^si5 Chazy group.) Emmons, Amer. Geology, Vol. 1, 

 part 2, page 235, plate 3, fig. 16. Axis with seven 

 or eight distinct articulations; side lobes furrowed, 

 Em.A^^P'^.3 or with false joints ; margins entire. Chazy forma- 

 tion.— 7/5. Collected by C. E. Hall for the survey in 1875, 

 in Kishicoquillis valley, Mifflin Co., Pa. Proc. A. P. S., Jan. 5, 

 1876. Chazy.— II h. ' 



Asaphus obtusus. (Hall. PaL^ontology of N. Y., Vol. L 

 ^jf^ .-^7f^ 1847, Chazy group.) Emmons, American Geol- 

 #^^,| f^!« ogy, Vol. I, part 2, page 23^, plate 3, "^^^ 14. A 

 Y .St-\'^ ^^ fragment too imperfect for identification, which 

 Em^Al'*^^^ n 3 may be A. marginatus — // &, Chazy forma- 

 tion. Specimens in the cabinet, GO, Pal. Coll. p. 233, speci- 

 mens 210-97-a ; 210-150 ; by Fellows, 1876, at Bellefonte, Cen- 

 tre county, in Trenton limestone. II c. Also 210-147, a hypos- 

 toma. 



Asaphus—? 00, Pal. Coll. Spec. 211-7, by Fellows, 1876, 

 at bluff above Tyrone forge, Huntingdon county, from Trenton 

 limestone.) II c. 



Asaphus platycephalnjS See Isotelus gigas. II c. 



Asaphus selenurus. See Dalmanites selenurus. VIII a. 



Aspidaria undulata. See Lepidodendron aculeatum 

 XIII 



Astarte suhtextilis. See Cardiomorpha subtextilis. 

 VIII f. 



Astartella {Edmondia) concentrica, McChesney Desc. 

 New Pal. Foss. Coal Measures — In Pennsvlvania it is found in 

 the Black fossiliferous limestone just above water level at 

 Pittsburgh (L, 35); at Livermore, (H4, 78) and in Beaver Co. 

 (Q, 30). In the Decher's creek shale, Stevenson in L, 37. 



