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l. Conspectus Crustaceorum qua in Orbis Terrarum Circumnaviga- 
tione, Carolo Wilkes e Classe Reipublice Federate Duce, lecit et. de- 
scripsit Jacosus D. Daxa—(Proceedings of the American Academy 
of Arts and Sciences, Boston, May 4, 1847, vol, i, p. 150-154, and 
Nov. 8, 1849, vol. ii, pp. 9-61.)—' This Conspectus includes descrip- 
tions of 183 new species of Entomostraca, collected by Mr. James D. 
Dana during the cruise of the Exploring Expedition. We here cite the 
descriptions of the genera and families introduced, as they contain some 
modifications of those received, and mention only the names of the new 
species included in the Conspectus under each genus. As elsewhere 
stated, the full Report on the Crustacea of the Expedition is in course 
of preparation and will be illustrated by drawings of these and the other 
new species collected. 
Onpo 29. ENTOMOSTRACA. 
SusonDo l. GNATHOSTOMATA.* 
Tribus L—CRUSTACEA CYCLOPACEA (vel Copepoda).] 
Familia I. CvcroPrripzx. 
Oculi duo simplices tantum. | Palpi mandibularum maxillarimque 
breves aut obsoleti. —Saccul? ovigeri duo. 
Genus I. Cvcrors.— Antenne maris antice subcheliformes aut ar- 
ticulo geniculante instructze. | 
Sp. C. brasiliensis, curticaudus, pubescens, MacLeayi, vitiensis. 
* See this Journal, 2nd Ser., i, 295. 
1 Cyclopaeeorum membra sunt :— 
Cephalothorax 4—i-artieulatus. Abdomen 1-6-artieulatum, carapace non tectum. 
Frons sspissimé rostrata, rostro aut simplice, aut fureato, aut transversim emar- 
ginato, aut appendicibus instructo. 
Oculi duo simpliees, pigmento aut connati aut disjuncti; quoque in quibusdam 
oculi duo coaliti sub capite insistentes ; aliis, oculi maximo lenticulo prolato et corneá 
laté oblatà constructi. 
Antenna antice 4—28-articulatze, aut simplices, aut appendiculatze; postice 2—5-ar- 
ticulatze et szepe ramum ferentes, aliis ad apicem setigerze, aliis subcheliformes. 
Mandibule ad apicem dentatsz, ssepius palpigerze:—membra cephalothoraeis ad 
normam quarta; itaque breviter denominata ct. iv. 
Maille duse (ct. v.) setose ; sepe palpigerze, palpo sive parvulo et vix discernendo, 
sive setas diffusas ferente. 
Mazillipedes (vel Maxillze, ct. vi.) duo, aliis parvi et parcius setigeri, aliis crassiores 
et valde setigeri. 
Pedes antici (ct. vii) duo simplices, aut obsolescentes aut elongati, aliis setigeri, 
aliis subcheliformes. 
Pedes biremes decem (ct. viii, ix, x, xi, xii); octo anteriores szpius natatorii, sed 
duo antici interdum subprehensiles; duo posteriores plurimum obsoleti aut parvuli ; 
in quibusdam masculinis pergrandes et uno ambove prehensiles. 
Abdominis ad basin pertinentes sepissimé pedes spwrii, sive obsolescentes sive 
oblongi et setis armati; ad extremum, styli caudales duo, unusquisque 4—6 setis ple- 
rumque plumosis instructus. 
Cephalothorace septem-articulato, ad segmentum primum. antennz quatuor perti- 
nent; ad secundum, mandibula, maxille, et maxillipedes (ct.iv, v, vi); ad tertium, 
