CAN. — CER.] 



CRUSTACEA. 



537 



senaria, Conrad, 1841, syn. for C. calli- 

 cephala. 



spinifera, not defined. 



trisulcata, Hall, 1843, Gep.JRep. 4th Dist. 

 N. Y., p. 74, Clinton Gr. 

 Candona, Baird, 1845, Trans. Berw. Nat. 

 Club, vol. 2, p. 152. A living genus, 

 and probably not Palaeozoic. Like 

 Cypris, except the lower antennae pos- 

 sess no tuft of setae, and the second 

 pair of jaws are destitute of a branchial 

 appendage. The shell is also usually 

 longer and narrower. Type C. lucens. 



(?) elongata, Jones & Kirby, 1884, Lond. 

 Geo. Mag., 3d ser., vol. 1, p. 356, Car- 

 boniferous. 

 Ceratiocaris, McCoy, 1849, Ann. and Mag. 

 Nat. Hist., 2d ser., vol. 4, p. 412. [Ety. 

 Iteration, pod ; fen's, shrimp,] Cara- 

 pace bivalve, dorsal line angulated 



f 



Ceratiocaris sinuata. Outliue. 



with a slight furrow beneath it on 

 each side ; sides semielliptical, much 

 elongated from before backward, evenly 

 convex, ventral margin gently convex, 

 posterior end truncated obliquely ; on 

 each side near the anterior end, low 

 down, is an ocular spot ; surface 

 marked with fine, imbricating striae. 

 Type C. solenoides. 



aculeata, Hall, 1859, Pal. N. Y., vol. 3, 

 p. 422, Walerlime Gr. 



acuminata, Hall, 1859, Pal. N. Y., vol. 3, 

 p. 422, Waterlime Gr. 



armata, syn. for Echinocaris punctata. 



bradleyi, see Colpocaris bradleyi. 



beecheri, Clarke, 1885, Bull. U. S. Geo. 

 Sur., No. 16, p. 44, Ham. Gr. 



dewevi, Hall, 1859, (Onchus deweyi,) Pal. 

 N. Y., vol. 2, p. 320, Niagara Gr. 



elytroides, see Colpocaris elytroides. 



grandis, Pohlman, 1881, Bull. Buf. Soc. 

 Nat. Hist., vol. 4, p. 19, Waterlime Gr. 



longicauda, see Echinocaris longicauda. 



maccoyana, Hall, 1859, Pal. N. Y., vol. 

 3, p. 421, Waterlime Gr. 



punctata, see Echinocaris punctata. 



pusillus, Matthew, 1889, Trans. Roy. Soc. 

 Can., vol. 6, p. 49, Low. Held. Gr. 



simplex, Clarke, 1885, Bull. U. S. Geo. 



Sur., No. 16, p. 43, Ham. Gr. 

 sinuata, Meek & Worth en, 1868, Am. Jour. 

 Sci., vol. 46, p. 22, and Geo. Sur. 111., 

 vol. 3, p. 540, Coal Meas. 

 strigata, see Solenocaris strigata. 

 Ceratocephala, Warder, not defined so as to 

 be recognized. 

 ceralepia, Anthony, a fragment of the 

 tail of a Ceraurus pleurexanthemus, or 

 of an Acidaspis. 

 goniata, Warder, a fragment of a Dal- 

 manites, or an Acidaspis. 

 Ceraurus, Green, 1832, Monograph Trilo- 

 bites, p. 84. fety. keras, horn ; oura, 

 tail.] Cephalic shield crescentiform, 

 trilobed, posterior angles extended into 

 spines; glabella subquadrate, rounded 

 and prominent in front, three lateral 

 furrows on each side ; eyes faceted 

 minutely; facial 

 sutures, commenc- 

 ing at the anterior 

 margin, passing 

 close to the anterior 

 corners of the gla- 

 bella curve around 

 the eyes, from 

 which points they 

 extend outward, 

 and then deflect a 

 little backward, and 

 cut the lateral 

 margins forward of 

 the neck furrow, if 

 it were extended ; 

 cheeks generally 

 scrobiculate; thorax 

 of ten or twelve 

 segments, axial lobe 

 narrower than the 

 lateral lobes; pleurae flattened for a 

 distance, and then curve downward 

 and backward ; pygidium small, seg- 

 ments terminating in digitations or 

 spines; labrum oblong truncate, with 

 a pair of furrows and small lateral 

 auricles. Type C. pleurexanthemus. 

 (?) apollo, Billings, 1860, (Cheirurus 

 apollo,) Can. Nat. and Geol., vol. 5, 

 p. 67, Quebec Gr. or Up. Taconic. 

 bimucronatus, see Ceraurus niagarensis. 

 cromlug, see Acidaspis crosotus. 

 (?) eryx. Billings, 1860, (Cheirurus eryx,) 

 Can. Nat. and Geol., vol. 5, p. 07, Que- 

 bec Gr. or Up. Taconic. 

 (?) glaucus, Billings, 1865, (Cheirurus 

 glaucus,) Pal. Foes., vol. 1, p. 323, Que- 

 bec Gr. or Up. Taconic. 

 icarus, Billings, 1860, (Cheirurus icarus,) 

 Can. Nat. and Geol., vol. 5, p. 67, Hud. 

 Riv. Gr. 

 insignis, see Ceraurus niagarensis. 

 meekanus, n. sp., Hud. Riv. Gr. Pro- 

 posed instead of C. icarus. Meek, in 

 Ohio Pal., vol. 1, p. 162, and plate 14, 

 figs, a, b, and c. Meek referred this 

 form to C. icarus of Billings, but it is 

 distinguished by the form of the gla- 



