. PAR.] 



CRUSTACEA. 



559 



PAL^OCREUSIA, Clarke, 1888, Pal. N. Y., vol. 

 7, p. 210. [Ety. palaios, ancient ; Creu- 

 sia, a genus.] Capitulum ovate, patel- 

 liform, surface conical; apex truncated 

 by a horizontal plane, forming a large 

 central aperture ; surface striated; basis 

 tubuliform, subcylindrical or cup- 

 shaped. Type P. devonica. 

 devonica, Clarke, 1888, Pal. N. Y., vol. 7, 



p. 210, Up. Held. Gr. 



PAL^EOPAL^EMON, Whitfield, 1880, Am. Jour. 

 Sci. and Arts, 3d ser., vol. 19, p. 40. 

 [Ety. palaios, ancient; palsemon, a genus.] 

 Shrimp-like, thoracic carapace nar- 

 rowed, but not rostrate in front and 

 keeled on the back and sides ; abdo- 

 men, six segments terminated by an 

 elongated, triangular, and pointed tel- 

 son ; segments arched; pleurae smooth, 

 not lobed or expanded, extremities 

 rounded ; sixth segment bearing cau- 

 dal flaps, one on each side, composed 

 of five visible elements, the outer four 

 apparently anchylosed to form a trian- 

 gular plate on each side of the telson ; 

 thoracic ambulatory appendages elon- 

 gated, smooth and filiform, except the 

 upper second joint, which is laterally 

 compressed ; abdominal appendages 

 short ; antennae large and strong. Type 

 P. newberryi. 



newberryi, Whitfield, 1880, Am. Jour. Sci. 

 and Arts, 3d ser., Vol. 19, p. 41, Erie shales. 

 PARADOXIDES, Brongniart, 1822, Hist. Nat. 

 Crust. Foss., p. 31. [Ety. paradoxos, 

 marvelous, paradoxical.] Cephalic 

 shield lunate, margin thickened, not 

 reflexed ; glabella clavate or oval, 

 moderately convex, enlarged anteriorly, 

 three curved furrows cross it, dividing 

 it into four parts ; fixed cheeks tumid ; 

 eyes oblong, lunate, distant and oppo- 

 site the second division of the glabella ; 

 facial suture, cutting the margin in 

 front of the eye and curving S-like 

 to the eye, and curving in like manner 

 to the posterior mar- 

 gin directly behind 

 the eye ; movable 

 cheek tumid and 

 prolonged in a spine ; 

 thorax 16 to 20; 

 segments, axis con- 

 vex, narrower than 

 the lateral lobes, lat- 

 eral lobes flattened 

 and turned back- 

 ward ; pygidium cir- 

 cular or oval ; axis 

 segmented, short, 

 lateral lobesiflattened 

 and projected back- 

 ward. Type P. tes- 



FIG. 1040. Paradoxides . sini> 



bohemicus. abenacus, Matthew, 



1885, Trans. Roy. 

 Soc. Can., p. 78, St. John Gr. 

 acadicus, Matthew, 1883, Trans. Roy. 

 Soc. Can., p. 103, St. John Gr. 



acadicus var. suricus, Matthew, 1885, 



Trans. Roy. Soc. Can., p. 77, St. 



John Gr. 

 arcuatus, Harlan, 1835, Trans. Geo. Soc., 



syn. for Triarthrus becki. 

 barberi, N. H. Winchell, 1885, 13th Ann. 



Rep. Geo. Sur. Minn., p. 67, Potsdam 



Gr. Not a Paradoxides. 

 bennetti, Salter, 1859, Quar. Jour. Geo. 



Soc., vol. 15, p. 552, Up. Taconic. 

 boltoni, see Lichas boltoni. 



FIG. 1041. Paradoxides harlani. 



decorus, Billings, 1874, Pal. Foss., vol. 2, 



p. 75, Up. Taconic. 

 eatoni, syn. for Triarthrus becki. 

 etemnicus, Matthew, 1883, Trans. Roy. 



Soc. Can. pp. 92, 271, St. John Gr. 

 etemnicus var. breviatus, Matthew, 1883, 



Trans. Roy. Soc. Can., p. 99, St. 



John Gr. 

 etemnicus var. malicitus, Matthew, Trans. 



Roy. Soc. Can., p. 101, St. John Gr. 

 etemnicus var. pontificalis, Matthew, 1883, 



Trans. Roy. Soc. Can., p. 102, St. 



John Gr. 

 etemnicus var. quacoensis, Matthew, 1883, 



Trans. Roy. Soc. Can., p. 102, St. 



John Gr. 

 etemnicus var. suricoides, Matthew, 1883, 



Trans. Roy. Soc. Can., p. 106, St. 



John Gr. 

 harlani, Green, 1834, Am. Jour. Sci., 



vol. 25, p. 336, Up. Taconic. 

 lamellatus, Hartt, 1868, Acad, Geol., p. 



656, St. John Gr. 

 lamellatus var. loricatus, Matthew, 1883, 



Trans. Roy. Soc. Can., p. 106, St. 



John Gr. 

 micmac, Hartt, 1868, Acad. Geol., p. 657, 



and Trans. Roy. Soc. Can., vol. 2, p. 



101, St. John Gr. 



