24 PROCEEDINGS OF THE AMERICAN ACADEMY 
giores, a basi arcuatz ; articulis 19, 14, 15, 16, 17 antenne dextrc in- 
crassulatis, articulo 17 elongato apice prominulo, partim subtilissimé 
pectinato, sequentibus sex brevibus, et tenuissimis. 
Long. 15". — Hab. in mari Pacifico prope * Valparaiso." — Lect. 
die 10 Ap., 1839. 
5. CawDacE ÁAuCTA. — Feminae : Cephalothorax 5 — 6-articulatus, 
posticé subacutus aut obtusus. Ántennz anticz fere corporis longitu- 
dine, e basi arcuatz, apice prorsum parce flexee, articulo secundo longo 
et crasso. Abdomen 2 — 3-articulatum. 
Long. 4". — Hab. in mari Pacifico, lat. aust. 9^, long. occ. 174^ ; 
etiam prope insulas ** Kingsmill" ; quoque in mari ** Sulu." — Lect. 
die 26 Jan., 1841; die 14 Ap., 1841; Dec., 1841 ; die 28 Jan., 1842. 
6. CanDaAcE TRUNCATA. — Pemince: Cephalothorax posticé trunca- 
tus. Antenne antieze corporis longitudine, prope articulum sextum 
flexze, deinde recté transverse et tenuissimze ; articulo secundo crasso, 
non longiore quam articulus tertius quartusve. | 
Long. 45,". — Hab. in mari Pacifico, prope insulas * Samoa" et 
* Kingsmill," et in mari * Sulu." — Lect. die 25 Mar., et die 1 Ap., 
1841 ; die 2 Feb., 1842. 
Genus VI. CYOLOPSINA. (Mine Edwards.) 
Rostrum furcatum. | Antenne antice sive rectz, sive leviter curvatze, 
maris dextrà articulatione geniculante. —Maaillipedes (ct. vi.) pedi- 
bus proximis majores, non geniculati, setis longis spinulosis instructi. 
Oculi inferiores nulli. ^ Cephalothorax 4—'/ articulatus, capite sepe 
discreto. Antenna postice iisdem Calani similes. Pes posticus 
dexter maris grandis et prehensilis.  [Maxillipedes, et maris anten- 
mam anticam dextram pedemque posticum dextrum, Pontelle affinis ; 
antennam posticam, oculos, et habitum, Calano similis. S? oculi én- 
feriores adsunt, species Pontelle pertinent.] 
SvN. — Cyclopsina (C. castor), Mi/ne Edwards. — Cetochilus?* Roussel 
de Vauzéme.— Monoculus (M. Castor) Jurine.— Cyclops (C. castor), 
Desmarest. — Dioptomus (D. castor), Westwood. — Non Cyelopsina 
Baird. 
l. CvcLoPsINA LoNceIcoRNIS. — Frons rotundata. ^ Cephalothorax 
posticé obtusus, 5-articulatus, articulis posticis equis. .Ántennze antice 
sesqui corporis longitudine, rectiusculz, setis brevibus, duabus subapi- 
calibus posticis preelongis, subszequis, apicalibus perbrevibus, anticá pe- 
nultimá articuli longitudine. Styli caudales breves. 
