CATALOGUE OF NON-TKILOBITES. 363 



3. Sutured along the back. Notched in front. 



Aptychopsis Barr., 1872; Syst. Sil. Bohftnie, vol. 1, suppL, p. 455. Angu- 

 lar notch. Middle and Upper Silurian (Murch.) 



Peltocaris Salt., 1SG3; Quart. Jour. Geol. Soc. Loudon, vol. 19, p. 87. 

 Rounded notch. Lower Silurian (Murch.) 



PiNNOCARi.s Eth., 1878; Proc. Royal Ph3's. Soc, Edinlj., vol. 4, p. 167. 

 Slightly notched. Lower Silurian (Murch.) 



II. Folded shield, bent along the back so as to form an overarching 



carapace, or a pair of attached valves. 



Hymenocaris Salt., 1852; Rep. 22d Meeting Brit. Adv. Sci., Trans. Sec, 

 p. 56. Smooth. Lingula-flags. Taconic 



?Cytheropsis testls Barr, 1872. Not well known. (Lower Silurian 

 Murch. ) 



Protocari.s Eaily, 1872. Not well known. Uppermost Devonian or Low- 

 est Carboniferous. 



II. Carapace Bivalved. 

 Sacocaris Salt., 1868; Proc Geol. Polytech. Soc, vol. 4, p. 588. Strongly 

 emarginated behind. Lingula-flags. 



1. Pod-like. 



Caryocaris Salt., 1863; Quart. Jour. Geol. Soc London, vol. 19, p. 139. 

 Pod-like; elongate narrow, smooth. Arenig and Lingula-flags. 



Ceratiocaris McCoy, 1849; Annals Mag. Nat. Hist. London, 2d series, 

 vol. 4, p. 412. 

 Pod-like, subovate, suboblong, striate. Tremadoc and Devonian in 

 America. 



Phvsocaris Salt., 1860; Annals Mag. Nat. Hist. London, 3d series, vol. 5, 

 p. 159. Round. Upper Silurian (Murch.) 



NoTHOzoE Barr., 1872; Syst. Sil. Boheme, vol. 1, suppl., p. 530. Oval. 

 Lower Silurian (Miirch.) 



Cryptozoe Pack., 1888. Proc. Acad. Nat. Sci. Phil., 1888, p. 381. Sub- 

 oblong. Carboniferous. 



XiPHOCARis Jones and Woodward, 1886. Only telson known. Silurian. 



CoLPOCARis Meek, 1871; Proc. Acad. Nat. Sci. Phil., p. 334. Subovate; 

 strongly emarginate at one end. Carboniferous. 



2. Pod-like. Ocnlate. 



Emmelezoe J. & \V.,,1886; Rep. 56th Meeting Brit. Adv. Sci., p. 232. 



Silurian. 



III. With swellings in the antero-dorsal region, one of which on each 



valve may be ocular. 

 EcHiNOCARis Whitf., 1880; Am. Jour. Sci., 3d series, vol. 19, p. 34. Leper- 



ditioid. Segments spiuose. Devonian. 



Aristozoe Barr., 1872; Syst. Sil. Boheme, vol. 1, suppl., p. 474. Upper 



Silurian (Murch.) 

 Orozoe Barr., 1872; Syst. Sil. Boheme, vol. I, suppl., p. 557. Upper 



Silurian (Murch.) 



