710 



CRUSTACEA. 



[OGY. 



rules of nomenclature is to be observed, 

 such generic names must be dis 

 regarded. The characters ascribed to 

 the genus are, probably, like other 

 characters, ascribed by the same author 

 to other genera, of no more than 

 specific value. It would not be ad- 

 visable, therefore, to propose a sub- 

 stantive name for the adjective. Ulrich 

 defined four species, curta, ovata, clavi- 

 gera, and stigmata, in Jour. Cin. Soc. 

 Nat. Hist., vol. 13, pp. L93to L96; but it 

 is only necessary to translate such 

 names to show the absurdity. OeUmaria 

 curia, oi eight short; Ot&unaria ovateC, 

 of eiyht ovate, etc. but the rules of 

 nomenclature absolutely require a sub- 

 stantive for a generic name. If authors, 

 who do not know how to distinguish an 

 adjective from a noun, would consult 

 some one who does before publishing 

 their new generic names, we might he 

 spared the trouble of indexing such 

 work. 

 OOTOOFSIS, Walcott, 1SSS. Proe. U. S. Nat. 



. Mus., p. 44»>. [Ety. from resemblance 

 to Ogygia.] Distinguished from Ogvgia 

 by having a well-defined ocular ridge 

 and a narrow palpebral lobe. Type 

 0. klotzi. 

 klotzi, instead of Ogygia klotzi. 



01, in I/us hroygeri, see Elliptocephala brog- 

 geii. 



Olenoidks (urticei, Walcott. 1888, Proc. 

 U. S. Nat. Mus., p. 44:'». Up. Taconic. 

 desideratns and ('). ellsi, Walcott, 1890, 

 10th Ann. Pep. U. S. < } e o. Sur., pp. 042, 

 644, Up. Taconic. 



Pachydomblla, riricb, 1890, Jour. Cin. Soc. 

 Nat. Hist., vol. 13, p. 197. [Ety. pachys, 

 thick; domus, house; ellv.x. diminutive.] 

 Carapace ventricose ; valves thick and 

 strong, the left much the largest, its thick 

 edges overlapping the right valve on all 

 sides; dorsal side strongly arched, ventral 

 edge more nearly straight, ends sub- 

 equal ; a faintly impressed, subcentral 

 umbilical pit. Type P. tumida, de- 

 scribed at the same place from the Up. 

 Held or Ham. Gr. 



I'aradoxides walcotti. Shaler & Foerste, 

 1888, Bull. Mus. Comp. Zool., vol. 16, 

 }>. 36, Up. Taconic. 



Phaoops has the facial sutures uniting in 

 front and abruptly curving from the 

 eyes to the lateral margins. The 

 hypostoma is convex and subtriangular. 

 pulchella, Foerste, 1887, Bull. Denison 

 Univ., vol. 2, p. 99, Niagata Gr. 



Ph.kthonides immaturus, P. occidentalis, 

 P. spinosus, Herrick, 1888, Bull. Deni- 

 son Univ., vol. 4, pp. 57 to 59, Wa- 

 ver! y < Jr. 



Phillipsia has an hypostoma longitudinally 

 convex, winged antero - laterally, and 

 terminating in an obtuse point behind. 

 The type of the genus is P. kellii instead 

 of P. gemmulifera. 

 bufo, refer to Griffithides bufo. 



consors, Herrick, 1888, Bull. Denison 

 Univ., vol. 4. p. 53, Keokuk Gr. 



nodocostata, Hare, 1891, Kansas City Sci., 

 vol. 5, p. 33, l'p. Coal. Meas. 



portlocki, refer to Griffithides portlocki. 



sampsoni, Vogdes, 1888, Trans. N. Y. 

 Acad. Sci., vol. 7, p. 246, Keokuk Gr, 



precursor, Herrick, 1888, Bull. Denison 

 Univ.. vol. :i, p. 29, Waverly Gr. 



serraticaudata. Herrick, 1888, Bull. Deni- 

 son Univ., vol. 4, p. 52, Coal Meas. 



shiuiianli. Herrick. 1887, bull. Denison 

 Univ., vol.2, p. 69. Proposed instead of 

 Proetus inissouriensis of Shumard. 



trinucleata, Herrick, 1SS7, bull. Denison 

 Univ., vol. 2, p. 64, Coal. .Meas. 

 Placknti i. a, Jones & IIoll, 1886, Ann. and 

 Ma». Nat. Hist., ser. 5, vol. 17, p, 407. 

 [Ety. placentula, a little cake.] Valves 

 BUborbicular, nearly semicircular on the 

 ventral border, straight on the dorsal 

 margin inside, but projecting with un- 

 equal and variable angles at the outer 

 dorsal region; surface Hat or slightly 

 convex, surrounded by a raised rim, 

 which slopes down suddenly outside the 

 edge of the valve; this rim incloses a 

 depressed and reticulated area, and in 

 or near the antero dorsal region there is 

 a small depression defined by a raised. 

 loop-like border. Type P. excavata. 



inornata, and P. margjnata, I'lrich, 1890, 

 Jour. Cin. Soc. Nat. Hist., vol. 13, ]». 121, 

 Hud. Riv. Gr. 

 Polycops, Bars, 1865, <>versigt af Norges 

 Marine Ostracoder. 



sublenticularis, Jones, L890, Quar. Jour. 

 Geo. Soc, vol. 46, p. 550, Anticosti Gr. 

 PONTOCYPBIS illinoisensis, Ulrich, 1890, 

 Jour. Cin. Soc. Nat. Hist. vol. 13, p. 107, 

 Hud. Riv. Gr. ; and P. acuminata, p. 

 210, Waverly (ir. 

 Pkimitia centralis, P. perminima, Ulrich, 

 1890, Jour. ('in. Soc. Nat. Hist., vol. 13, 

 p. 130, Utica Slate; and P. glabra, I'. 

 impressa, P. medialis, P. milleri, P. 

 nodosa, P. rudis, pp. 131 to 136, Hud. 

 Riv. <ir. ; and P. nitida, P. sculptilis, 

 pp. 135, 136, Trenton Gr. ; and P cestri- 

 ensis, P. cestriensis var. caldwellensis, 

 P. granimarginata, P. simulans, and P. 

 subaquata, pp. 201, 202, Kaskaskia Gr. 



clarkei, Jones, 1890, Quar. Jour. Geo. Soc, 

 vol. 46, p. 535, Corniferous Gr. ; P. wal- 

 cotti, .p. 543, Corniferous Gr. ; P. bil- 

 linjjsi, p. 547, Clinton Gr. ; P. seminu- 

 lum, p. 5, Ham. Gr. ; P. ulrichi, and P. 

 whitfieldi, pp. 6, 9, Utica Slate. 



lativia and P. parallela, ulrich, 1889, 

 Micro-Pal. of Can., pp. 51, 52, Hud. 

 Riv. Gr. 



minuta, Eichwald, 1854, (Cvpridina mi- 

 nuta,) Bull. Imp. Soc. Nat. Moscow, vol. 

 27, p. 99, Hud. Riv. Gr. 



mundula var. effusa, Jones, 1891, Cont. 



to Can. Micro Pal., p. 64, Chazy Gr. ; 



and P. incisa, p. 64, Trenton Gr. ; and 



P. scitula, p. 91, Devonian. 



Primitiocsis, Jones, 1887, Sil. Ostrac Goth- 



