CYC. CYT.] 



CRUSTACEA. 



541 



FIG. 990.-Cyphas- 

 pis christyi. 



Cydus americanus, Packard, 1885, Am. Nat., 

 vol. 19, p. 293. Coal Meas. Not de- 

 fined so as to be recognized. 

 CYPHASPIS, Burmeister, 1843, Die Organ der 

 Trilobiten, p. 103. [Kty. cyphos, con- 

 vex; asf>is, shield.] Cephalic shield 

 semicircular, posterior angles produced 

 in spines, margin thickened ; glabella 

 very convex, ovoid, no furrows, but 

 with two small pyriform basal lobes 

 bounded by deep furrows ; eyes small, 

 semilunate ; cheeks broad ; facial su- 

 tures proceed in a nearly straight line, 

 from the anterior margin to the eyes, and 

 are then directed to the posterior an- 

 gles ; thorax 10 to 17 segments, rounded 

 at their extremities; axis tapering; 

 pygidium small, axis short, lateral lobes 

 depressed. Type C. ceratopthalmus. 

 breviinarginatus, Walcott, 1885, Monogr. 

 U. S. Geo. Sur., vol. 

 8, p. 93, Trenton Gr. 

 christyi, Hall.Trans. Alb. 

 Inst., vol. 4, p. 188, Ni- 

 agara Gr. 



coelebs, Hall, 1888, Pal. 

 N. Y., vol. 7, p. 151, 

 Low. Held. Gr. 

 craspedota, Hall, 1888, 

 Pal. N. Y., vol. 7, p. 

 148, Ham. Gr. 

 diadema, Hall, 1888, 

 Pal. N. Y., vol. 7, p. 

 144, Up. Held. Gr. 

 girardeauensis, Shumard, 1855, Geo. Rep. 



Mo., p. 197, Trenton Gr. 

 hybrids, Hall, 1888, Pal. 

 N. Y., vol. 7, p. 144, 

 Up. Held. Gr. 

 laevis, Hall, 1876, (Phil- 

 lipsia laevis,) Illust. 

 Devon. Foss., pi. 21, 

 ChemungGr. 

 minuscula, Hall, 1876, 

 (Phillipsia m i n us- 

 cula,) Illust. Devon. 

 Foss., pi. 20, Up. Held. 

 Gr. 



ornata, Hall, 1876, 

 (Phillipsia ornata,) 

 Illust. Devon. Foss. 

 pi. 21, Ham. Gr. 

 ornata var. baccata, Hall, 1888, Pal. N. Y., 



vol. 7, p. 146, Ham. Gr. 

 stephanophora, Hall, 1888, Pal. N. Y., 



vol. 7, p. 142, Up. Held. Gr. 

 Cyihere, Muller, 1785, Entomo^-traca sue In- 

 secta, etc., p. 63. The type is C. fla- 

 vida a living specips. The genus is un- 

 knowu in Palaeozoic rocks. 

 ommcona, see Beyrichia americana. 

 earbonaria, see Leperditia carhonaria. 

 cincinnaliensis, see Cytheropsis cincinnati- 



ensis. 

 crasximarginata, see Cytheropsis crassimar- 



ginata. 



irrtgularis, see Cytheropsis irregularis. 

 nebraakensis, see Cytheropsis nebraskensis. 

 okeni, see Leperditia okeni. 



Wi.-Cyphas- 

 Krdeauen- 



-Cytherella in- 

 flata. 



simplex, see Cytheropsis simplex. 

 sublsevis, see Leperditia sublsevis. 

 subrecta, see Leperditia subrecta. 

 CYTHERELLA, inflata. 



I find in the 



Acadian Geol- 



ogy, p. 206, a 



small Entomos- 



traca, from the FIG 



Coal Meas. of 



Nova Scotia, fig- 



ured under this name, but without 



any description or reference to any 



other author. The figures are repro- 



duced. 

 Cytherella glandella, see Cytheropsis glan- 



della. 

 Cytherina, Lamarck, 1818, Anim. sans Vert. 



t. v, p. 125. [Ety. diminutive of 



Cy there.'] A synonym for Cythere, 



which is not a Palaeozoic genus. 

 alta, see Leperditia alta. 

 crenulata, see Cytheropsis crenulata. 

 cylindrica, see Isochilina cylindrica. 

 fabulites, see Leperditia fabulites. 

 spinosa, see Be3 r richia spinosa. Not Reuss 



in 1844. 

 subcylindrica, . see Cytheropsis subcylin- 



drica. 



subelliptica, see Cytheropsis subelliptica. 

 CYTHEROPSIS, McCoy, 1849, Ann. and Mag. 



Nat. Hist., 2d. ser., vol. 4, p. 249. [Ety. 



Cytheropsis, resembling Cythere.] Dis- 



tinguished from Cythere, which now 



swarm in the sea, by the great thick- 



ness of the valves, and in having eye 



or muscle spots. Type C. aldensis. 

 cincinnatiensis, Meek, 1872, (Cythere cin- 



cinnatiensis,) Proc. Acad. Nat. Sci., p. 



331, and Ohio Pal., vol. -..,,_.. 



1, p. 158, Hudi Riv. Gr. /T^V 

 concinna, see Primitia ^]^^|r 



concinna. ^ifflr^ 



crassimarginata, Win- FIG. 993Cyther- 



chell, 1862, (Cythere ^ cmclnnati ' 



crassimarginata,) Proc. 



Acad. Nat. Sci., p. 429, Marshall Gr. 

 crenulata, Emmons, 1856, (Cytherina 



crenulata,) Am. Geol., p. 220, Tren- 



ton Gr. 



FIG. 994. Cytheropsis glandella. 



glandella, Whitfield, 1882. (Cytherellina 



glandella,) Bull. Am. Mus. Nat. Hist., 



vol. 1, p. 94, Warsaw Gr. 

 irregularis, S. A. Miller, 1878, (Cythere 



irregularis,) Jour. Cin. Soc. Nat. Hist., 



vol. 1, p. 106, Hud. Riv. Gr. 

 nebraskensis, Geinitz, 1866, (Cythere ne- 



braskensis,) Garb, und Dyas in Neb., p. 



2, Coal Meas. 

 rugosa, Jones, 1858, Ann. Nat. Hist., 3d 



ser., vol. 1, p. 249, Black Riv. Gr. 

 siliqua, Jones, 1858, Ann. Nat. Hist., 3d 



ser., vol. 1, p. 249, Black Riv. Gr. 



