[CYT. — ISO. 



CRUSTACEA. 



707 



Cy there ohioenxis, see Cytheropsis ohio- 

 ensis. 



Cytheuella, Jones, 1849, Monog. Entom. 

 Cret, p. 28. [Ety. diminutive of Cyihere.~\ 

 Carapace oblong, compressed, smooth or 

 pitted ; no terminal denticulations ; 

 contact margins of the right (larger) 

 valve grooved or rabbeted on its inner 

 edge for the reception of a flange pre- 

 sented by the contact margin of the 

 left (smaller) valve ; both groove and 

 flange stronger at the posterior than at 

 the anterior portion of the valves. The 

 lucid spots resemble those in Cypri- 

 dina. 

 ovatiformis, Ulrich, 1890, Jour. Cin. 

 Soc. Nat. Hist., vol. 13, p. 209, Kas- 

 kaskia Gr. 



Cytherina phaseolus, see Leperditia phaseolus. 



Cytherellina, Jones & Holl, 1869, Ann. and 

 Mag. Nat. Hist., vol. 3, p. 215. [Ety. 

 from Cytherella. ] Carapace valves 

 elongate, convex, smooth, thick, ex- 

 cavated internally, with undulating con- 

 tours. Type C. siliqua. 

 glandella, instead of Cytheropsis glandella. 



Cytheropsis concinna, see Aparchites con- 

 cinnus. 

 ohioensis, Herrick, 1888, (Cythere ohio- 

 ensis,) Bull. Denison Univ., vol. 4, p. 

 60, Waverly Gr. 



Dalmanites troosti, Safford, 1889, (Chasm- 

 ops troosti,) Proc. Acad. Nat. Sci., Tren- 

 ton Gr. 



Depranella, Ulrich, 1890, Jour. Cin. Soc. 

 Nat. Hist., vol. 13, p. 117. Carapace 

 small, high, subelliptical in outline, 

 dorsal border straight, terminating ab- 

 ruptly at each end ; ventral border 

 nearly straight or gently convex, round- 

 ing almost evenly at the ends ; a 

 sickle-shaped ridge runs nearly parallel 

 with tbe posterior and ventral edges, 

 and is sometimes produced beyond the 

 postero- dorsal border; dorsal slope 

 with two or more strong tubercles or 

 ridges ; the two valves meet equally at 

 the ventral edge. Type D. crassinoda, 

 which is described at the same place, 

 from the Birdseye Gr., with D. ampla, 

 D. elongata, D. macer, D. nitida, pp. 119 

 to 121, Chazy Gr. 

 richardsoni, S. A. Miller, 1874, (Beyrichia 

 richardsoni,) Cin. Quar. Jour. Sci., vol. 

 1, p. 347, Hud. Riv. Gr. 



Dionide is from N. Jahrb. fur Miner., Hft. 4, 

 p. 391, and Syst. Sil. Boh., p. 640. 



Elliptocephala broggeri, Walcott. 1889, 

 (Olenellus broggeri,) Proc. U. S. Nat. 

 Mus., vol. 12, p. 41, Up. Taconic. 



Elpe, Barrande, 1872, Syst. Sil. Boh., vol. 1, 

 Supp. p. 510. Type E. pinguis. 

 tyrrelli, Jones, 1891, Cont. to Micro-Pal., 

 p. 93, Devonian. 



Encrinurus excedrensis, Safford, 1889, Proc. 

 Acad. Nat. Sci., Trenton Gr. 

 thresheri, Foerste, 1887, Bull. Denison 

 Univ., vol. 2, p. 101, Niagara Gr. 



Entomis, Jones, 1861, Mem. Geol. Sur. Gt. 



Brit., Geol. Edinb., p. 137. Carapace 

 ovate-oblong, bean-like ; valves indented 

 by a transverse furrow, which begins on 

 the dorsal margin, at about one-third of 

 its length from the anterior extremity, 

 and reaches half-way or more across 

 the valve ; surface bearing in front of 

 the sulcus a tubercle or spine which is 

 sometimes wanting ; anterior border not 

 indented. Type E. tuberosa. 

 madisonensis, Ulrich, 1890, Jour. Cin. Soc. 

 Nat. Hist, vol. 13, p. 107, Hud. Riv. Gr.; 

 and E. waldronensis, p. 183, Niagara 

 Gr. 

 rhomboidea, Jones, 1890, Quar. Jour. Geo. 

 Soc, vol. 46, p. 20, Ham. Gr. 



Eurychilina, Ulrich, 1889, Micropakeon- 

 tology of Can., p. 52. [Ety. eurys, broad ; 

 cheilos, lip.] Valves somewhat semicir- 

 cular or semi- elliptical ; dorsal line 

 straight ; subcentral sulcus and a node 

 behind it; broad border, often striated; 

 hinge simple ; surface reticulate, gran- 

 ulous, or smooth. Type E. reticulata, 

 which is described at the same place 

 from the Trenton Gr., and also E. man- 

 itobensis. 

 sequalis, E. granosa, E. longula, E. obesa, 

 E. subradiata, Ulrich, 1890, Jour. Cin. 

 Soc. Nat. Hist, vol. 13, p. 126 to 129, 

 Chazy and Birdseye Gr. 

 striatomarginata, S. A. Miller, (Beyrichia 

 striatomarginata,) 1874, Cin. Quar. Jour. 

 Sci., vol. 1, p. 233, Hud. Riv. Gr. 



Eurysoma, Claypole, 1890, Am. Geol., vol. 6, 

 p. 259. The name was preoccupied. 

 See Carcinosoma. 

 newlini, see Carcinosoma newlini. 



Griffithides, Portlock, 1843, Rep. Geol. 



Londonderry, p. 310. [Ety. proper 



name.] Distinguished from Phillipsia, 



which it closely resembles by the pyri- 



form or tumid glabella and small, 



smooth, lunate eyes. Type G. longiceps. 



bufo, Meek & Worthen, 1870, Proc. Acad. 



Nat. Sci., p. 52, and Geo. Sur. 111., vol. 5, 



p. 528, Keokuk Gr. 



portlocki, Meek & Worthen, 1865, Proc. 



Acad. Nat. Sci., p. 268, and Geo. Sur. 



111., vol. 5, p. 525, Keokuk Gr. 



sedaliensis, Vogdes, 1888, Trans. N. Y. 



Acad. Sci., vol. 7, p. 276, Waverly Gr. 



Halliella, Ulrich, lh90, Jour. Cin. Soc. Nat. 

 Hist, vol. 13, p. 184. [Ety. proper name.] 

 Valves similar to Primitia, but with a 

 larger sulcus, narrow at the dorsal edge, 

 and widening as it extends downward ; 

 posterior lobe smaller than the an- 

 terior ; the latter generally divided at 

 or near the straight dorsal edge ; sur- 

 face ornamented or smooth ; ventral 

 edge thick. Type H. retifera, described 

 at the same place from the Up. Held, 

 or Ham. Gr. 



Harpides. Type H. hospes. 



Isochilina amii, I. labellosa, I. grandis var. 

 latimarginata, I. Ottawa var. intermedia, 

 and I. whiteavesi, Jones, 1891, Cont. to 

 Can. Micropalpeontology, pp. 68 to 78, 



