450 GEOLOGICAL SURVEY OF THE TERRITORIES. 
Genus CERATIOCARIS McCoy, 1850. 
Leptocheles McCoy, 1850. 
Carapace bivalved, united by a hinge-like suture, the valves ovate, 
semiovate, or subquadrate, with a long, narrow rostrum. Head (or 
thorax?) with joimted appendages. Body many (fourteen or more) 
jointed, of which 5 or 6 segments extend beyond 
the carapace; the last one longest, and support- 
ing a strong, bulbous telson and two shorter 
appendages. Surface generally lineate, often 
finely so. 
C. papilio Salter, Siluria, 262, figs. 1,2, vol.5. Great 
Britain. 
C. stygius Salter, Ann. Mag. Nat. Hist. 1860; Quart. Am. 
1860, 156. Great Britain. 
. nornatus McCoy, |. c. 156. Great Britain. 
. murchisoni McCoy, |. c. 157. Great Britain. 
. leptodactylus McCoy, 1. ec. 157. Great Britain. 
. robustus Salter, 1. ec. 157. Great Britain. 
. decorus Phillips, Mem. Geol. Sury. ii, Pl. 30, fig. 5. 
Great Britain. 
.? ensis Salter, 1. c. 159. Great Britain. 
. vesica Salter, J. c. 159. Great Britain. 
. cassia Salter, 1. c. 159. Great Britain 
. aptychoides Salter, Quart. Geol. Journ. viii, Pl. 21, fig. 
10. Great Britain. 
. ludensis Woodw., Geol. Mag. viii, 3, 1871. (Over two 
feet in length.) 
. oretonensis Woodw., 1. c. 
. truncatus Woodw., |. e. 
? brevicauda Salter; Bigsby, J. J. Thesaurus silur. 73, 
1868. 
? gigas Salter; Bigsby, J. J. Thesaurus siluy. 73, 1868. 
? legqumen Salter; Bigsby. J. J. Thesaurus silur. 73, 
1e68. 
? perornatus Salter; Bigsby, J. J. Thesaurus silur. 73, 
1868. 
bohemicus Barrande, Syst. Sil. 447, Pl. 19. Bohemia. 
debilis Barr., |. c. Pls. 18, 19, 26, 31. Bchemia. 
decipiens Barr., 1. ¢. Pl. 21. Bohemia. 
, \ f docens Barr., 1. c. Pl. 21. Bohemia. 
abe qe ingearis punctatus; (’, inequalis Barr., 1. c. Pl. 19, var. decurtata. Bohemia, 
Reo ee a size: C, primulus Barr., 1. c. Pl. 18. Bohemia. 
C. scharyi Barr., 1. c. Pl. 32. Bohemia. 
C. tardus Barr., 1. c. Pl. 18. Bohemia. 
C. longicaudus Hall, 16th Rep. State Cab. N. York, Pl. 1, figs. 4-7, 1863. Genesee. 
C. (Onchus) dewit Hall,’ Pal. N. York, ii, 320, Pl. 71, 1852. New York. 
C. uicecoyai Hall, Pal. N. York, iii, 420, 1859. New York State. Devonian. New 
ork. 
C. acuninagus Hall, 1. ec. 1859. New York. 
C. aculeatus Hall, 1. c. 1859. New York. 
PGIW QOS GoQ A Gaga Seaqe 
Genus ECHINOCARIS Whitfield, 1880. 
Carapace bivalve, valves subovate. Abdomen composed of several 
segments, each bearing spines on the posterior margin. Type, H. sub- 
levis Whitfield. 
E,. sublevis Whitfield, Amer. Journ. Sc. 36, 1880. 
E. punctatus (Hall), 16th Rep. State Cab. N. Y. 74, Pl. 8, fig. 1. 
1The following species are of doubtful position (see, also, Whitfield, 1. c.): 
Ceratiocaris (Colpocaris) bradleyi Meek, Ohio Geol. Surv. Paleontology, Pl. 18, figs. 
6a-e, 318, 1875. 
Ceratiocaris (Colpocaris) elytroides Meek, 1. c. Pl. 18, figs. 5a, b, c, 319. 
Ceratiocaris (Solenocaris) striaia Meek, 1. c. Pl. 12, figs. 4a, b, ¢, 321. 
