364 CALIFORNIA ACADEMY OF SCIENCES. 



ELYMOCARIS Beecher, 1884; 2d Geol. Survey Perm., vol. PPP., p. 13. 



Devonian. 

 TROPIDOCARIS Beecher, 1884; 2d Geol. Kep. Penn., vol. PPP, p. 15. 



Wrinkled . Devonian . 



PTYCHOCARIS Novak, 1885; Sitzungsb. bohm. Gesell., 1885, p. 343. 



Wrinkled. Silurian. 



PHASGANOCARIS Novak, 1886; Sitzungsb. bohm. Gesell., 1886, p. 498. 



Only telson known. Silurian. 



IV. With swellings in the antero- ventral region; ocular tubercle not 



apparent . 



CALLIZOE Barr., 1872; Syst. Sil. Boheme, vol. 1, suppl., p. 503. Leper- 

 ditoid. Silurian. 



V. Conchiferoidal. 



LINGTJLOCARIS Salt., 1866; Mem. Geol. Survey, vol. 3, pp. 252, 253, and 294. 



Modioloid, and faintly ridged. Tremadoc. 



STRIGOCARIS Vogd., 1889. Pod-shaped and concentrically marked. 



Carboniferous. 



SOLENOCARIS Young, 1868; Proc. Nat. Hist. Soc. Glasgow, vol. 1, p. 171. 

 ? ORTHONOTELLA Ulrich, 1882. Oblong. Silurian. 



MYOCARIS Salt., 1864; Quart. Jour. Geol. Soc. London, vol. 20, 1864, p. 292. 



Quadrangular and ridged obliquely. Silurian or Devonian. 



PlNACARID^E. 



MESOTHYRA Hall, 1888; Palaeont. New York, vol. 7, pp. Ivi, 187. Hamilton 

 and Portage formations. 



KHINOCARID.S;. 



RHINOCARIS Clarke, 1888; Paleeont. New York, vol. 7, p. Iviii. Anterior 

 extremity of the head produced into a point. Devonian. 



NOT CLASSIFIED. 



PROTOCARIS Wai., 1885; Bull. U. S. Geol. Survey, No. 10, p. 50. Taconic. 

 ANOMALOCARIS Whiteaves, 1892; Canadian Kec. Sci., vol. 5, p. 205. 



Taconic. 



ROSTROCARIS Kinnear, 1887; Trans. Edinb. Geol. Soc., vol. 5, p. 417. 

 ARCHJEOCARIS Meek, 1871; Proc. Acad. Nat. Sci. Phila., p. 335. 



Carboniferous. 

 DICTYOCARIS Salt., 1860; Annals Mag. Nat. Hist. London, 3d series, vol. 3, 



p. 101. 

 ACANTHOCARIS Peach, 1882; Trans. Eoyal Soc. Edinb., vol. 30, p. 511. 



PHYLLOPODA. 

 LEAIA Jones, 1882; Mon. Fossil Estheria, p. 115. Quadrangular, ridged 



obliquely, and concentrically marked. Carboniferous. 



ESTHERIA Eiippell, 1857; Mus. Senckenberg, vol. 2, p. 119. Like a bivalved 



mollusc and concentrically marked. Devonian. Carboniferous. 



Triassic. Khsetic. Jurassic. Cretaceous. Tertiary Eecent. 

 ESTHERIELLA Weiss, 1875; Zeitsch. Geol. Gesell. Berlin, vol. 27, p. 711. 

 SCHIZODISCUS Clarke, 1888; Palseont. New York, vol. 7, p. 207. Devonian. 



