644 Mr. R. Gurney on some Spiracular channels broad, opening directly on to or close to the margin, closely studded with tubular ducts. Dorsum with irregularly disposed series of small, densely chitinous, cribriform plates (dg. 3, c) varying in size, form, and number of pores, but always much smaller and less conspicuous than those o( formicarum, each plate with a narrow, sharply defined, paler outer border. Derm of dorsum \ ith smaller and larger pores (the latter thick-rimme 1) and with transverse series of spiniform setae, which are larger and more numerous on the abdominal segments. Anal operculum surrounded by a densely chitinous zone, sprinkled with small pores and larger ovoid lacuQse. Anal ring with sixteen (or more) stout setfe. Margin of body without fringe of spines or setse. Stigmatic clefts obscure, without stigmatic spines. Length of average examples 2*5 mm. Xymph very similar to the adult, but smaller and flatter, and without a denser chitinous area surrounding the anal aperture. Antenna 5-jointed, the basal joint in the form of a narrow band, second joint largest. Legs (fig. 3, e) reduced to conical points, with obscure traces of partial segmentation ; with a minute apical claw. Cribriform plates as in adult, but often less strongly chitinized. Anal ring with ten setse. Spiracular channels opening directly on to the margin. No stigmatic spines. Xo marginal spines or setae. Larva not observed. Coimbatore, India. On roots of Cassia sp. Coll. T. V. Ramakrishna (no. 204), 9. iii. 1921. LXX. — Some new or rare British Crustacea. By Robert Guenet. M.A. 1. Canthocamptus echinatus, Mrazek. In July 1919 a few specimens of a species of Canthocamptus resembling C. echinatus were taken at Flordon Common near Norwicli, but I was unable at the time, with the scanty material available, to determine its identity with certainty, and I was unable to find the species again on a second visit to the spot. In 1920 the same form was found in considerable
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