. Fig. 21. Katius obesus, Chevr. a. Pleurae of pleon segments 1-3, adult ? (St. 101). b. The same, juvenile (St. 78). c. Spine from apex of outer lobe of maxilla 1. d. Apex of outer plate of maxilliped. e. Anterior margin of head with basal joints of antenna 2, epistome and upper lip. Basal joint of antenna 2 large, bulbous, visible externally (as in Eurythenes). Maxilla 1, outer lobe with spines which bear acute and rather widely spaced denticles (as in Eurythenes), inner lobe with 2-4 plumose setae in young, five in adult. Maxilliped, outer plate with minute wart-like spinules on inner margi
. Fig. 21. Katius obesus, Chevr. a. Pleurae of pleon segments 1-3, adult ? (St. 101). b. The same, juvenile (St. 78). c. Spine from apex of outer lobe of maxilla 1. d. Apex of outer plate of maxilliped. e. Anterior margin of head with basal joints of antenna 2, epistome and upper lip. Basal joint of antenna 2 large, bulbous, visible externally (as in Eurythenes). Maxilla 1, outer lobe with spines which bear acute and rather widely spaced denticles (as in Eurythenes), inner lobe with 2-4 plumose setae in young, five in adult. Maxilliped, outer plate with minute wart-like spinules on inner margin (as described by Schellen- berg for Eurythenes, 1927, p. 678), 2-3 more obviously spiniform ones distally, and 2-3 plumose setae on outer distal margin. Branchiae with moderate folds, seemingly indicated in Chevreux's fig. 3 C, but not mentioned in his text. Arising from near the base of each branchia on segments 2-7 posteriorly and externally is a small irregularly triangular accessory lobe. After the above remarks there would seem to be no need to harp further on the similarity of Katius to Eurythenes. Besides the dactyli of peraeopods 1-5 and the side- plates, a further difference may exist in the branchiae, but Liljeborg's statement (loc. cit. under Eurythenes, p. 6) ought to be confirmed.
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Keywords: ., bookcentury1900, booksubjectocean, booksubjectscientificexpediti
