EMB. EUP.] 



CRUSTACEA. 



547 



the inner margins for fimbria. Type 

 E. siliqua. 

 capsella, Hall, 1888, Pal. N. Y., vol. 7, p. 



181, Ham. Gr. 

 siliqua, Beecher, 1884, Rep. Pa. Geo. Sur. 



PPP, p. 13, Chemung Gr. 

 Embolamus rotundatw, Rominger, syn. for 



Bathyuriscus howelli. 

 spinosa, Rominger, syn. for Olenoides 



spinosus. 



ENCRINURUS, Emmrich, 1845, Neues Jahrb. f. 

 Mineral, p. 42. [Ety. en, prefix; krino, 

 parted ; oura, tail.] Cephalic shield 

 semielliptical, tuberculated, lateral an- 

 gles produced into spines ; glabella pyri- 

 form, three furrows at each side toward 

 the base; cheeks flattened, triangular; 

 eyes in the middle of the cheeks, ele- 

 vated on foot- stalks; facial suture behind 

 the eye cuts the outer margin in front 

 of the angles ; thorax with eleven seg- 

 ments ; pygidium triangular, lateral 

 lobes with about eight segments, de- 

 flected, sometimes pointed ; axis nar- 

 row, convex, with numerous segmental 

 lines. Type E. punctatus. 

 deltoideus, Shumard, 1855, Geo. Sur. Mo., 

 p. 198, Up. Sil. 



egani, S. A. Miller, 

 1880, Jour. Gin. Soc. 

 Nat. Hist., vol. 2, p. 

 254, Niagara Gr. 

 elegantulus, Billings, 

 1866, Catal. Sil. Foss. 

 Antic., p. 62, Anti- 

 costi Gr. 

 excedrensis, S a ff o r d , 



Not defined. 

 Isevis, Angelin, 1852, 

 (Cryptonymus Ise- 

 vis,) Palseontologia 

 Scandinavica, p. 4, 

 Up. Sil. 



mirus, Billings, 1865, 

 Pal. Foss., vol. 1, p. 

 292, Quebec Gr. or Up. Taconic. 

 multisegmentatus, Portlock, 1843, (Am- 

 phion multisegmentatus,) Rep. Geo. of 

 Londonderry, etc., Anticosti Gr. 

 nereus, Hall, 1867, 20th 

 Rep. N. Y. St. Mus. 

 Nat. Hist., p. 425, 

 Niagara Gr. 

 ornatus, Hall & Whit- 

 field, 1875, Ohio Pal., FIG. 1005.-Encrinu- 

 vol. 2, p. 154, Niag- r fffi nl - Ce P halic 

 ara Gr. 



phlyctainpdes, Green, 1837, (Calymene 

 phlyctainodes,) Am. Jour. Sci. and 

 Arts, vol. 32, p. 167, and Pal. N.Y.,vol. 

 2, p. 314, Niagara Gr. 

 punctatus, Wahlenberg, 1821, Nova Acta 



Soc. Upsal., Anticosti Gr. 

 trentonensis, Walcott, 1877, Rep. N. Y. 

 St. Mus. Nat. Hist., p. 68, Tren- 

 ton Gr. 



varicostatus, Walcott, 1877, 31st Rep. N. Y. 

 St. Mus. Nat. Hist., p. 69, Trenton Gr. 

 vigilans, Hall, 1847, (Ceraurus vigilans,) 



FIG. 1004. Encrinu 

 rus egani. 



Pal. N. Y., vol. 1, p. 245, Black Riv. and 

 Trenton Grs. 



Endymion, Billings, 1862. The name being 

 preoccupied for a genus of plants, the 

 author proposed Endymionia. 

 meeki. see Endymionia meeki. 



ENDYMIONIA, Billings, 1865, 

 Pal. Foss., vol. 1, pp. 

 93, 281. [Ety. ' proper 

 name.] Cephalic 

 shield semioval, con- 

 vex ; glabella ovate, 

 convex, an elongate 

 oval tubercle on each FlG 1006 ._ End y. 

 side ; thorax of six or mionia meeki. 

 seven segments, axis 

 convex, side lobes flat, groove crossing 

 them diagonally; pygidium semioval, 

 trilobed and divided by furrows into 

 segments; distinguished fromTrinucleus 

 by the absence of a punctured border 

 on the head shield, and from Ampyx 

 by the form of the glabella, which has 

 a tubercle on each side, and is destitute 

 of a rostrum. Type E. meeki. 

 meeki, Billings, 1862, (Endymion meeki,) 

 Pal. Foss., vol. 1, pp. 93, 281, Quebec 

 Gr. or Up. Taconic. 



Enoploura, Wetherby, 1878, Jour. Cin. Soc. 

 Nat. Hist., vol. 1, p. 163. Proposed 

 instead of Anomalocystites, upon the 

 ground that it is a Crustacean, instead 

 of a Cystidean. 



ESTHERIA, Ruppell, and Straus-Durckheim, 

 1837, Mus. Senckenberg., vol. 2, p. 

 119. [Ety. proper name.] Carapace 

 valves oval, globose, with a definite 

 hinge-line, well marked umbones and 

 concentric ridges, valves inequilateral, 

 subtrigonal or subovate, umbo near an- 

 terior end. Type E. dahalacensis. A 

 living genus, and probably not Palseo- 

 zoic. 



pulex, Clarke, 1882, Am. Jour. Sci. and 

 Arts, 3d ser., vol. 23, p. 466, Ham. Gr. 



EUPROOPS, Meek, 1867, Am. Jour. Sci., vol. 

 43, p. 394. [Ety. eu, very ; pro, for- 

 ward; ops, eye.] Cephalo- thoracic 

 shield crescentric, more than twice as 

 wide as long, convex, lateral angles 

 terminating in spines; posterior mar- 

 gin concave, from the lateral angles 

 two-thirds of the distance to the middle, 

 the central part being straight or 

 slightly concave ; the ocular ridge sur- 

 rounds a crown-shaped or subquadran- 

 gular area, occupying the central third 

 of the shield ; the sides are slightly 

 concave, in front there is a central 

 emargination, and posteriorly the ridge 

 is continued in a spine, on each side, 

 directed back over the abdomen ; eyes 

 small, compound, located at the antero- 

 lateral angles of the crown-shaped cen- 

 tral area ; mesial lobe small, narrowing 

 forward and reaching the ocular ridge, 

 in a linear carina ; it bears a tubercle on 

 the posterior part; abdomen trans- 

 versely subelliptical, mesial lobe nar- 



