AGR. AMP.] 



CRUSTACEA. 



527 



FIG. 954. 



AgllOhUlS 



rex. 



nobilis, Ford, 1872, Am. Jour. Sci., 3d 

 per., vol. 3, p. 421, Up. Taconic. 



obtusilobus, Matthew, 1885, Trans. Roy. 

 Soc. Can., p. 72, St. John Gr. 



orion, Billings, I860, Can. Nat. and Geo., 

 vol. 5. p. 301, and Pal. Foss., vol. 1, p. 

 397, Up. Taconic. 



?parilis, Hall, 1S63, 16th Rep. N. Y. St. 

 Mus. Nat. Hist., p. 179, Potsdam Gr. 



partitus, Matthew, 1885, Trans. Roy. Soc. 

 Can., p. 68, St. John Gr. 



prolongus, Hall & Whittield, 1877, U. S. 

 Geo. Ex pi. 40th parallel, p. 230, Pros- 

 pect Mountain Gr., Up. Taconic. 



regulus, Matthew, 1885, Trans. Roy. Soc. 

 Can., p. 67, St. John Gr. 

 ^_ rtx, Barrande. Probably not 



jfa3& an American species, but 



ygf illustrative of the genus. 



rffY^nk richmondenRs, Walcott, 1884, 



w|2// Monogr. U. S. Geo. Sur., 



vol. 8, p. 24, Prospect 

 Mountain Gr., Up. Taconic. 

 seclusns, Walcott, 1884, Mon- 

 ogr. U. S. Geo. Sur., vol. 8, p. 

 25, Prospect Mountain Gr., Up. Taconic. 



Bimilis, llartt, 1868, Acad. Geol., p. 656, 

 St. John Gr. 



tessella, Matthew, 1885, Trans. Roy. Soc. 

 Can., p. 71, St. John Gr. 



tumidof.us, Hall & Whitfield, 1877, U. S. 

 Geo. Expl. 40tb parallel, vol. 4, p. 231, 

 Up. Taconic. 



umbo, Matthew, 1885, Trans. Roy. Soc. 

 Can., p. 71, St. John Gr. 



vir, Matthew, 1885, Trans. Roy. Soc. Can., 

 p. 69, St. John Gr. 



vir var. concinnus, Matthew, 1885, Trans. 



Roy. Soc. Can., p. 70, St. John Gr. 

 AGRAULUS, Hawle & Corda, 1847, Prodrom. 

 einer Monographic der bomischen 

 Trilobiten, p. 142. [Ety. agraulos, dwell- 

 ing in the fields.] Body elongate- 

 ovate; cephalic shield large, serpicir- 

 cular to lunate, with a wide margin, 

 that merges in the cheeks; glabella 

 convex, narrowed and rounded in 

 front, conoidal, three or four lateral 

 furrows on each side, margined in 

 front, neck furrow distinct; eyes small, 

 distant from glabella or submarginal ; 

 facial sutures, beginning near the lat- 

 eial posterior angles, are directed for- 

 ward, curving over the eyes to the an- 

 terior margin, nearly in parallel lines; 

 cheeks small, narrow ; sixteen thoracic 

 segments, axal lobe convex; pygidium 

 small, rounded, three segments; hypo- 

 stoma oval, truncated anteriorly. Type 

 A. cetice|ihnlus. 



affinis, Billings, 1874, Pal. Foss., vol. 2, p. 

 72, Up. Taconic. 



aiticeplialus, Matthew, 1885, Trans. Roy. 

 Soc. Can., p. 75, St. John Gr. 



bipunctatus, Shumard, 1863, (Arionellus 

 bipunctatus,) Trans. St. Louis Acad. 

 Sci., vol. 2, p. 101, Potsdam Gr. Poorly 

 defined; probably belongs to another 

 genus. 



FTG. 955. 



A gran I us 



cylindricus. 



convexus, Whitfield, 1877, (Arionellus 

 convexus,) Geo. Sur. Wis., vol. 4, p. 

 . 190, Potsdam Gr. Founded upon a frag- 

 ment, and may belong to another genus, 

 cylindricus, Billing?, 1860, 

 (Arionellus cylindricus, 

 Can. Nat. and Geo., vol. 

 5, p. 301, and Pal. Foes., 

 vol. 1, p. 406, Up. Ta- 

 conic or St. John Gr. 

 globosus, Walcott, 1885, 

 Monogr. U. S. Geo. Sur., vol. 8, p. 61, 

 Up. Taconic. 



hallanus, Matthew, 1887, Trans. Roy. Soc. 

 Can., p. 132, St. John Gr. 



planus, Shumard, 1861, (Arionellus pla- 

 nus,) Am. Jour. Sci. and Arts, 2d. 

 series, vol. 32, p. 219, Potsdam Gr. 



pustulatus, Walcott, 1879, (Arionellus 

 pustulatus,) 31st Rep. N. Y. St. Mus. 

 Nat. Hist., p. 68, Chazy Gr. 



quadrangularis, Whitfield, 1884, (Arionel- 

 lus quadrangularis,) Bull. Am. Mus. 

 Nat. Hist., vol. 1, p. 139, Up. Taconic. 



socialis, Billings, 1874, Pal. Foss., vol. 2, 

 p. 71, Up. Taconic or St. John Gr. 



strenuus. Billings, 1874, Pal. Foss., vol. 2, 

 p. 71, Up. Taconic or St. John Gr. 



subclavatus, Billings, 18<JD, (Arionellus 

 subclavatus,) Can. Nat. and Geo., vol. 

 5, p. 301, and Pal. Foss., vol. 1, p. 406,. 

 Up. Taconic or Quebec Gr. 



texanus, Shumard, 1861, (Arionellus tex- 

 anus,) Am. Jour. Sci. and Arts, 2d ser., 

 vol. 32, p. 218, Potsdam Gr. or Up. Ta- 

 conic. 



tripunctatus, Whitfield, 1876, Rep. Recon. 

 Up. Mo. to Yel. Nat. Park, p. 141, 

 Potsdam Gr. or Up. Taconic. 



whitfieldanus, Matthew, 1887, Trans. Roy. 

 Soc. Can., p. 130, St. John Gr. 



whitfieldanus var. compressus, Matthew 

 1887, Trans. Roy. Soc. Can., p. 130, St. 

 John Gr. 



woosteri, Whitfield, 1878, Geo. Sur. Wis., 



vol. 4, p. 189, Potsdam Gr. 

 AMPIIION, Pander, 1830, Beitrage zur Geog- 

 nosie des Russischen Reiches, p. 139. 

 [Ety. mythological name.] Cephalic 

 shield short, transverse; glabella con- 

 vex or subrectangular, three pairs of 

 furrows, front inclosing a small fore- 

 head lobe ; eyes small ; facial suture, 

 behind the eyes, ending on the exterior 

 margin in advance of the rounded an- 

 gles; thorax 15 

 to 18 articula- 

 tions; pleurse 

 with out 

 grooves ; pygid- 

 ium with short 

 axis and pleurae 

 with free ter- 

 minations; lab- 

 rum pointed, FIG. 956 -Amphion cana- 

 convex, mar- densis ' ^ ldlum - 

 gined. Type A. frontiloba. 



barrandii, Billings, 1865, Pal. Foss., voL 

 1, p. 288, Quebec Gr. 



