  We report results of a study of doubly charmed baryons and charmed strange
baryons. The analysis is performed using a 980 fb^-1 data sample collected with
the Belle detector at the KEKB asymmetric-energy e^+e^- collider. We search for
doubly charmed baryons Xi_cc^+(+) with the Lambda_c^+K^-pi^+(pi^+) and
Xi_c^0pi^+(pi^+) final states. No significant signal is observed. We also
search for two excited charmed strange baryons, Xi_c(3055)^+ and Xi_c(3123)^+
with the Sigma_c^++(2455)K^- and Sigma_c^++(2520)K^- final states. The
Xi_c(3055)^+ signal is observed with a significance of 6.6 standard deviations
including systematic uncertainty, while no signature of the Xi_c(3123)^+ is
seen. We also study properties of the Xi_c(2645)^+ and measure a width of 2.6
+- 0.2 (stat) +- 0.4 (syst) MeV/c^2, which is the first significant
determination.
